JP5531666B2 - Imaging apparatus, image quality adjustment system, imaging method, and program - Google Patents

Description

  The present invention relates to an imaging apparatus that forms an optical image of a subject with a lens, an image quality adjustment system, an imaging method, and a program.

In recent years, in digital cameras, a technique for correcting distortion of an optical image inherent in a lens by correcting a captured image (see, for example, Patent Document 1).
For example, in Patent Document 1, each of a plurality of zoom stages is associated with each of correction parameters for correcting the distortion in order to correct distortion generated at each zoom stage of the zoom lens. .

JP 2008-295097 A

  However, in the case of the technique described in Patent Document 1, correction processing is performed in all of a plurality of zoom stages even if only a slight effect can be obtained depending on the zoom stage, thereby increasing the burden on image processing. There is a problem.

  Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide an imaging device, an image quality adjustment system, an imaging method, and a program that can reduce the processing burden for image correction.

In order to solve the above-mentioned problem, the invention according to claim 1 relates to imaging means for converting an optical image that has passed through the optical element into image information and outputting the image information, and distortion of the optical image based on movement of the optical element. Whether to correct the image information output from the imaging means when the optical element is at a specific position according to the optical characteristic information, or to enlarge the image information output from the imaging means at a predetermined rate A control unit that controls to perform at least one of the following: image information processed by the control unit , or output from the imaging unit when the optical element is not at a specific position and controlled by the control unit Output means for outputting non-image information as a processed image.

The invention according to claim 2, in the invention described in claim 1, and a control by the control means, prior Symbol further comprising a storage means for storing in association with the optical characteristic information, said control means, said based on the optical characteristic information, the optical element is characterized in that reading out at least one of the ratio of the correction contents or expansion processing when a particular location from the storage means.

According to a third aspect of the present invention, in the imaging apparatus according to the second aspect , the optical element includes a zoom adjustment lens that constitutes an optical zoom mechanism, and the specific position refers to the zoom adjustment lens. The lens position is a position corresponding to the wide-angle end.

According to a fourth aspect of the present invention, in the third aspect of the present invention, at least one of the content of correction by the control means or the ratio of the enlargement processing is varied according to the lens position of the zoom adjustment lens. Yes.

Invention of Claim 5 is an image quality adjustment system which adjusts the image quality of the image which the imaging device as described in any one of Claims 2-4 images, Comprising: The said optical characteristic information is the said optical element, Based on the recording information represented by the recording information recorded on the associated information recording medium and reading the recording information from the information recording medium, and from the storage means based on the recording information read by the reading means And setting means for setting the correction contents to be read and the ratio of the enlargement processing in the imaging apparatus.

An imaging method according to a sixth aspect of the invention is an imaging method using an imaging device including an imaging unit that converts an optical image that has passed through an optical element into image information and outputs the image information, and is based on the movement of the optical element. A process for correcting image information output from the imaging means when the optical element is at a specific position according to optical characteristic information related to distortion of the optical image, and the optical element specified according to the optical characteristic information A step of performing at least one of the processes for enlarging the image information output from the imaging means at a predetermined ratio when it is at the position, a process for correcting the image information, and a process for enlarging the image information of the image information at least one has been applied, or the processing and predetermined ratio of the optical element is output from the imaging means when not in a specific position the correction of Is characterized by performing the step of outputting the image information processing enlarge have not been applied as the processed image.

According to a seventh aspect of the present invention, there is provided a program for an imaging apparatus including an imaging unit that converts an optical image that has passed through an optical element into image information and outputs the image information, and relates to distortion of the optical image based on movement of the optical element. According to the optical characteristic information to be corrected, correcting means for correcting image information output from the imaging means when the optical element is at a specific position, and according to the optical characteristic information, when the optical element is at a specific position Image information to which at least one of enlargement processing means for enlarging the image information output from the imaging means at a predetermined ratio, correction by the correction means, and enlargement processing by the enlargement processing means , or processing image information that has not been processed by the optical element is output from the imaging means when not in a particular position the correction means and the enlargement processing unit Output control means for outputting as a finished image, is characterized in that to function as a.

  According to the present invention, it is possible to reduce the processing burden for image correction.

It is a block diagram which shows schematic structure of the imaging device of one Embodiment to which this invention is applied. It is a figure which shows typically the memory map of the memory of the imaging device of FIG. It is a figure which shows typically distribution of the individual variation with respect to the nominal value of the focal distance of the wide-angle end in a zoom lens. It is a figure which shows typically the memory map of ROM of the imaging device of FIG. It is a figure which shows typically an example of the data for distortion correction and the data for expansion which concern on the imaging device of FIG. 3 is a flowchart illustrating an example of an operation related to a memory writing process by the imaging apparatus of FIG. 1. 3 is a flowchart illustrating an example of an operation related to image quality adjustment processing by the imaging apparatus of FIG. 1. It is a figure which shows typically an example of the image which concerns on the image quality adjustment process of FIG. It is a block diagram which shows schematic structure of the image quality adjustment system of one Embodiment to which this invention is applied.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.
FIG. 1 is a block diagram illustrating a schematic configuration of an imaging apparatus 100 according to an embodiment to which the present invention is applied.

The imaging apparatus 100 according to the present embodiment outputs an image output from the electronic imaging unit 2 when the zoom adjustment lens 1a is at a position corresponding to the wide-angle end according to the lens type related to the distortion of the optical image of the zoom lens unit 1. At least one of a process of correcting information and a process of enlarging image information output from the electronic imaging unit 2 at a predetermined ratio when the zoom adjustment lens 1a is at a position corresponding to the wide-angle end. Process and output the processed image.
Specifically, as illustrated in FIG. 1, the imaging apparatus 100 includes a zoom lens unit 1, an electronic imaging unit 2, a CDS / ADC unit 3, a memory 4, a ROM 5, an image processing unit 6, and a display. A control unit 7, a display unit 8, an image recording unit 9, an operation input unit 10, and a CPU 11 are provided.

The zoom lens unit 1 includes an optical zoom mechanism including a plurality of optical lenses, and adjusts the position in the optical axis direction of a zoom adjustment lens (optical element) 1a among the plurality of optical lenses. To change the focal length.
Specifically, for example, when the optical zoom magnification is designated by the CPU 11 based on a predetermined operation of the zoom button of the operation input unit 10 by the user, the lens driving unit (for example, a motor, cam, etc.) 1b is sent from the CPU 11. The zoom adjustment lens 1a is moved in the direction of the optical axis in accordance with the designation instruction for the optical zoom magnification that is output and input, and the position of the zoom adjustment lens 1a in the direction of the optical axis is adjusted.
The lens drive unit 1b may function as a drive source or a power transmission mechanism for adjusting the position of the focus adjustment lens (not shown) in the optical axis direction among the plurality of optical lenses.

  For example, although not shown, the electronic imaging unit 2 includes an image sensor such as a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS). Then, the electronic imaging unit 2 converts an optical image that has passed through various optical lenses and a diaphragm (not shown) of the zoom lens unit 1 into a two-dimensional image signal (RGB image data) and outputs it to the CDS / ADC unit 3. To do.

  As described above, the zoom lens unit 1 and the electronic imaging unit 2 constitute an imaging unit that converts an optical image that has passed through the zoom adjustment lens 1a into image information and outputs the image information.

The CDS / ADC unit 3 receives an image signal composed of RGB color components corresponding to the optical image of the subject output from the electronic imaging unit 2 and, if necessary, image data corresponding to the YUV color space (YUV image data). Or image data (HSV image data) corresponding to the HSV color space and output to the CPU 11.
Further, the CDS / ADC unit 3 may adjust the gain amount of the RGB components of the input image and perform white balance adjustment of the image.

  The memory 4 includes a RAM 4a and a flash memory 4b.

The flash memory 4b is a nonvolatile memory, and stores the lens type (optical characteristics; described later) of the zoom lens unit 1 assembled in the imaging device 100 (see FIG. 2).
Specifically, when the imaging apparatus 100 is manufactured, a design value (described later) related to the actual focal length at the wide-angle end using a predetermined measuring apparatus (not shown) after the zoom lens unit 1 is assembled to the apparatus body. The flash memory 4b stores information (lens type) on the optical characteristics of the zoom lens unit 1 specified based on the design value among the plurality of lens types in a predetermined lens type storage area of the memory map. Write.

Next, an example of a lens type divided according to the optical characteristics of the zoom lens unit 1 will be described with reference to FIG.
As shown in FIG. 3, when the allowable range with respect to the focal length at the wide-angle end is set within ± 5% of the nominal value of the focal length (value published by the lens manufacturer), for example, the type of the zoom lens unit 1 within the allowable range Is the lens type “0”. Further, the zoom lens unit 1 that is outside the allowable range and within the error range (for example, within the design value of the focal length + 5% or less) is divided into a predetermined number (for example, three) according to the optical characteristics. Then, the types of the zoom lens unit 1 are set to the lens types “1”, “2”, and “3” in order from the design value close to the allowable range.
Here, the design value is information regarding optical performance exhibited in a state where an optical lens delivered from a lens manufacturer is assembled to the imaging apparatus 100.

  The classification of the lens types “0” to “3” is an example and is not limited to these, and the number of classifications can be arbitrarily changed as appropriate. In addition, each lens type classification may be determined in consideration of the difference between the distortion correction parameter and the enlargement parameter. For example, in the lens type “0”, the distortion correction parameter and the enlargement parameter A more detailed classification may be set according to the deviation. Furthermore, the size of each section may be substantially equal, for example, or may be changed depending on whether or not the size is close to the allowable range.

  As described above, the lens types “0” to “3” are classified according to the optical characteristics related to the distortion of the optical image based on the movement in the optical axis direction of the zoom adjustment lens 1 a provided in the zoom lens unit 1. That is, the lens type is associated with optical characteristic information related to distortion of the optical image based on the movement of the zoom adjustment lens 1a.

The RAM 4a is constituted by, for example, a DRAM or the like, and temporarily stores data processed by the image processing unit 6, the CPU 11, or the like.
Further, the RAM 4a stores the lens type of the lens read from the flash memory 4b and assembled to the imaging device 100 (see FIG. 2). Specifically, when the imaging apparatus 100 is powered on, information on the lens type stored in the flash memory 4b is read, and the lens type is a normal lens type, that is, by distortion correction or enlargement processing of the image. In the case of a lens having a compatible optical performance (for example, lens types “0” to “3”), information about the read lens type is stored in a predetermined lens type storage area of the memory map. Write.

  The ROM 5 stores various processing programs and various data for the imaging apparatus 100. Specifically, the ROM 5 stores distortion correction data d1 and enlargement data d2 used in image quality adjustment processing by the image processing unit 6.

The distortion correction data d1 is stored in the distortion correction data storage area of the memory map of the ROM 5 (see FIG. 4). The distortion correction contents by the image correction unit 6a of the image processing unit 6 and the zoom lens unit 1 The lens type (optical characteristics) is stored in association with each other.
Specifically, the distortion correction data d1 is a distortion correction parameter used for distortion correction by the image correction unit 6a for each zoom stage of the optical zoom mechanism of the zoom lens unit 1 and for each lens type of the zoom lens unit 1. (Correction content). For example, as shown in FIG. 4, “D PARAM Z1,0” for the lens of the lens type “0” and the lens type “1” are used as the distortion correction parameters at the first zoom stage (wide-angle end) of the optical zoom mechanism. "D PARAM Z1,1" for lenses of "D", "D PARAM Z1,2" for lenses of lens type "2", and "D PARAM Z1,3" for lenses of lens type "3" It is remembered. Similarly, “D PARAM Z2,0” for the lens type “0” and “D PARAM Z2,” for the lens type “1” are used as distortion correction parameters for the second stage of the zoom of the optical zoom mechanism. “1”, “D PARAM Z2,2” for the lens of the lens type “2”, and “D PARAM Z2,3” for the lens of the lens type “3” are stored. Similarly, the third and subsequent zoom stages are also stored in association with each other up to the telephoto end side, but illustration is omitted.
It should be noted that the distortion correction parameters for each zoom stage of the optical zoom mechanism are defined based on, for example, a result of actual photographing in advance using a design value or a lens sample.

The enlargement data d2 is stored in the enlargement data storage area of the memory map of the ROM 5 (see FIG. 4). The contents of the enlargement processing by the enlargement processing unit 6b of the image processing unit 6 and the lens type of the zoom lens unit 1 are stored. (Optical characteristics) are stored in association with each other.
Specifically, the enlargement data d2 includes the enlargement parameter (enlargement) used for the enlargement processing by the enlargement processing unit 6b for each zoom stage of the optical zoom mechanism of the zoom lens unit 1 and for each lens type of the zoom lens unit 1. The ratio of processing). For example, as shown in FIG. 4, “E PARAM Z1,0” for the lens of the lens type “0” and the lens type “1” are used as the enlargement parameters at the first zoom stage (wide angle end) of the optical zoom mechanism. "E PARAM Z1,1" for lens of "3", "E PARAM Z1,2" for lens of lens type "2", and "E PARAM Z1,3" for lens of lens type "3" Has been. Similarly, as an expansion parameter for the second zoom stage of the optical zoom mechanism, “E PARAM Z2,0” for the lens type “0” and “E PARAM Z2,1” for the lens type “1” are used. , “E PARAM Z2,2” for the lens of the lens type “2”, and “E PARAM Z2,3” for the lens of the lens type “3” are stored. Similarly, the third and subsequent zoom stages are also stored in association with each other up to the telephoto end side, but illustration is omitted.
Note that the enlargement parameter for each zoom stage of the optical zoom mechanism is defined based on, for example, a result of actual photographing in advance using a design value or a lens sample.

Here, an example of the intensity of distortion correction and the ratio of enlargement processing with respect to the focal length at the wide-angle end will be described with reference to FIG.
FIG. 5 illustrates an example of the contents of the distortion correction data d1 and the enlargement data d2 corresponding to the nominal value and the design value of the focal length at the wide angle end. Further, the design value is shifted by 3% toward the telephoto end side with respect to the nominal value of the focal length.
The distortion correction parameter related to the distortion correction data d1 is expressed as a Dis correction value (%), and the smaller the negative numerical value, the smaller the correction intensity. The enlargement parameter related to the enlargement data d2 is expressed as an enlargement ratio (100: 1 times), and the smaller the numerical value, the smaller the enlargement ratio.

As shown in FIG. 5, since the degree of distortion aberration increases as the optical lens becomes closer to the wide-angle end side, the intensity of distortion correction also increases as the Dis correction value similarly becomes closer to the wide-angle end side. Further, in the case of a zoom lens of the lens type “0” that is within ± 5% of the nominal value of the focal length, the Dis correction value is defined for each 1% error with respect to the nominal value of the focal length. Specifically, Dis correction values are `` -6.00 '', `` -6.63 '', `` -7.27 '', `` -7.90 '', `` -8.33 '', `` -8.77 '', `` -9.20 '', `` -9.63 '', “-10.07” and “-10.50” are defined so that the strength of distortion correction increases from the telephoto end side toward the wide-angle end side.
On the other hand, in the zoom lenses of lens types “1” to “3”, the Dis correction value corresponding to the lens type “1” is “−5.00”, and the Dis correction value corresponding to the lens type “1” is “−”. The Dis correction value corresponding to “4.50” and the lens type “1” is “−4.00”, and the Dis correction value is defined according to each lens type.

Further, as with the Dis correction value, the magnification of the image data increases as the distortion correction intensity increases toward the wide-angle end. Further, the zoom ratio of the image data differs between the zoom lens within the nominal value ± 5% of the focal length and the zoom lens outside this range. Specifically, the zoom ratio of the zoom lens of the lens type “0” is different. Is “103.0”, and the zoom ratio of the zoom lenses of the lens types “1” to “3” is “102.0”.
Thus, in the zoom lenses of the lens types “1” to “3”, the enlargement ratio is fixed, but the Dis correction value increases as the deviation of the design value from the nominal value toward the telephoto end increases. It has been made smaller. Accordingly, in the zoom lenses of the lens types “1” to “3”, the specific gravity of the image data enlargement process in the image processing is gradually increased as the deviation of the design value from the nominal value toward the telephoto end increases. The specific gravity of correction is gradually decreasing.

  Here, the ROM 5 associates the distortion correction parameter (correction content) related to the image correction unit 6a and the enlargement parameter (enlargement processing ratio) related to the enlargement processing unit 6b with the lens type (optical characteristic information). Storage means for storing is configured.

  Further, in FIG. 5, the degree of deviation of the design value from the nominal value, the numerical values of the distortion correction parameter and the enlargement parameter, and the like are merely examples, and can be arbitrarily changed as appropriate. is there.

  The image processing unit 6 receives the image data output from the CPU 11 when recording the image data output from the CDS / ADC unit 3, and performs various image processing, compression, etc. on the image data to form a file. To do. Then, the image processing unit 6 transfers the filed image data to the image recording unit 9.

  The image processing unit 6 includes an image correction unit 6a and an enlargement processing unit 6b.

The image correction unit 6 a corrects the input image data output from the CDS / ADC unit 3 with a predetermined correction intensity according to the lens type associated with the optical characteristics of the zoom lens unit 1.
That is, the image correction unit 6 a performs distortion correction on the image data output from the CDS / ADC unit 3 and input, and based on the distortion correction data d 1 stored in the ROM 5, the zoom lens unit For each lens type, the distortion correction intensity (correction content) is varied according to the position of the zoom adjustment lens 1a in the optical axis direction. Specifically, first, when a predetermined operation signal related to an instruction to specify an optical zoom magnification is input based on a predetermined operation of the zoom button of the operation input unit 10 by the user, the CPU 11 receives an optical corresponding to the specification instruction. The zoom stage of the zoom mechanism, that is, the position of the zoom adjusting lens 1a in the optical axis direction is specified. Then, the CPU 11 reads out the corresponding distortion correction parameter (see FIG. 4) in the distortion correction data d1 from the ROM 5 based on the specified zoom stage of the optical zoom mechanism and the lens type of the zoom lens unit 1, and reads the image. Set in the correction unit 6a. Then, the image correction unit 6a performs distortion correction on the image data with an intensity corresponding to the distortion correction parameter (see FIG. 8A and the like).
Note that the image correction unit 6a performs the distortion correction by varying the intensity of the zoom adjustment lens 1a in the optical axis direction (zoom stage) for each lens type of the zoom lens unit 1. The intensity of distortion correction is set according to the lens type (optical characteristics) of the zoom lens unit 1 at least when the zoom adjustment lens 1a is at a specific position, for example, a position corresponding to the wide-angle end. What is necessary is just to make it variable.

Here, the image correction unit 6a has the zoom adjustment lens 1a at a specific position in accordance with the optical characteristic information (lens type) of the zoom lens unit 1 related to the distortion of the optical image based on the movement of the zoom adjustment lens 1a. In some cases, correction means for correcting image data output from the electronic imaging unit 2 is configured.
Further, the image correction unit 6a and the CPU 11 read out correction contents when the zoom adjustment lens 1a is at a specific position from the ROM 5 based on the lens type as correction means. The image correction unit 6a is a process of reading out the corresponding distortion correction parameters in the distortion correction data d1 from the ROM 5 based on the zoom stage of the optical zoom mechanism and the lens type of the zoom lens unit 1 independently of the CPU 11. May be performed.

The enlargement processing unit 6b enlarges the input image data output from the CDS / ADC unit 3 at a predetermined ratio according to the lens type associated with the optical characteristics of the zoom lens unit 1.
That is, the enlargement processing unit 6b cuts out the image data output and input from the CDS / ADC unit 3 at a predetermined ratio with reference to a predetermined position (for example, approximately the center of the image), and then the entire cut-out part is predetermined. The ratio is enlarged (roughly uniformly), and based on the enlargement data d2 stored in the ROM 5, the ratio of the enlargement process for each lens type of the zoom lens unit 1 is changed to the optical axis of the zoom adjustment lens 1a. Variable according to the position of the direction. Specifically, first, when a predetermined operation signal related to an instruction to specify an optical zoom magnification is input based on a predetermined operation of the zoom button of the operation input unit 10 by the user, the CPU 11 receives an optical corresponding to the specification instruction. The zoom stage of the zoom mechanism, that is, the position of the zoom adjusting lens 1a in the optical axis direction is specified. Then, the CPU 11 reads out the corresponding enlargement parameter (see FIG. 4) in the enlargement data d2 from the ROM 5 based on the specified zoom stage of the optical zoom mechanism and the lens type of the zoom lens unit 1 and enlargement processing unit Set to 6b. The enlargement processing unit 6b cuts out the image data at a rate corresponding to the enlargement parameter, and then performs a process of enlarging the cut out portion (see FIG. 8A and the like).
The enlargement processing unit 6b varies the enlargement processing ratio according to the position (zoom stage) of the zoom adjustment lens 1a in the optical axis direction for each lens type of the zoom lens unit 1, but the present invention is not limited to this. However, when at least the zoom adjustment lens 1a is at a specific position, for example, at a position corresponding to the wide-angle end, the ratio of the enlargement process is changed according to the lens type (optical characteristics) of the zoom lens unit 1. You can do that.

Here, the enlargement processing unit 6b moves the zoom adjustment lens 1a to a specific position according to the optical characteristic information (lens type) of the zoom lens unit 1 related to the distortion of the optical image based on the movement of the zoom adjustment lens 1a. In some cases, enlargement processing means for enlarging the image data output from the electronic imaging unit 2 at a predetermined rate is configured.
Further, the enlargement processing unit 6b and the CPU 11 read out from the ROM 5 a ratio of enlargement processing when the zoom adjustment lens 1a is at a specific position based on the lens type as enlargement processing means. The enlargement processing unit 6b performs a process of reading out the corresponding enlargement parameter in the enlargement data d2 from the ROM 5 based on the zoom stage of the optical zoom mechanism and the lens type of the zoom lens unit 1 independently of the CPU 11. May be.

  Further, the image processing unit 6 outputs, as output means, image data that has undergone distortion correction by the image correction unit 6a and enlargement processing by the enlargement processing unit 6b to the CPU 11 as a processed image.

The display control unit 7 performs control for reading display image data temporarily stored in the memory 4 and displaying the read image data on the display unit 8.
Specifically, the display control unit 7 includes a VRAM, a VRAM controller, a digital video encoder, and the like (all not shown). The digital video encoder periodically reads out the luminance signal Y and the color difference signals Cb and Cr read from the memory 4 and recorded in the VRAM under the control of the CPU 11 from the VRAM through the VRAM controller, Based on these data, a video signal is generated and output to the display unit 8.

  The display unit 8 is, for example, a liquid crystal display device, and displays an image captured by the electronic imaging unit 2 on the display screen based on a video signal from the display control unit 7. Specifically, the display unit 8 updates the live view image while sequentially updating a plurality of image frames generated by the imaging of the subject by the electronic imaging unit 2 at a predetermined frame rate in the still image capturing mode and the moving image capturing mode. Is displayed.

  The image recording unit 9 includes, for example, a non-volatile memory or the like, and includes recording still image data or a plurality of image frames encoded in a predetermined compression format by an encoding unit (not shown) of the image processing unit 6. Is recorded.

  The operation input unit 10 is for performing a predetermined operation of the imaging apparatus 100. Specifically, the operation input unit 10 includes a shutter button related to an imaging instruction of a subject, a selection determination button related to an instruction to select an imaging mode, a function, etc., a zoom button related to an instruction to adjust the zoom amount, etc. A predetermined operation signal is output to the CPU 11 in response to the operation of these buttons.

  The CPU 11 controls each part of the imaging device 100. Specifically, the CPU 11 performs various control operations according to various processing programs (not shown) for the imaging apparatus 100 read from the ROM 5.

Next, the memory writing process by the imaging apparatus 100 will be described with reference to FIG.
FIG. 6 is a flowchart illustrating an example of an operation related to the memory writing process.

The memory writing process is a process executed when the power of the imaging apparatus 100 is turned on.
As shown in FIG. 6, when the power of the imaging apparatus 100 is turned on, the CPU 11 first executes initialization such as enabling access to the RAM 4a of the memory 4 or writing a predetermined initial value (step S1). ).

Thereafter, the CPU 11 reads out information regarding the lens type written in the flash memory 4b of the memory 4, that is, the lens type of the lens assembled in the imaging apparatus 100 (step S2), and the lens type is normal. Is determined (step S3). That is, the CPU 11 determines whether or not the lens type is a type (for example, lens types “0” to “3”) having optical performance that can be handled by image distortion correction and enlargement processing.
If it is determined in step S3 that the lens type is normal (step S3; YES), the CPU 11 writes information on the read lens type in a predetermined lens type storage area of the memory map of the RAM 4a. (Step S4), the memory writing process is terminated.

  On the other hand, when it is determined in step S3 that the lens type is not normal (step S3; NO), the CPU 11 outputs an instruction to execute an error display indicating that the lens type is abnormal to the display control unit 7. The display control unit 7 displays a predetermined error display on the display unit 8 (step S5). Thereafter, as a precaution, the CPU 11 writes information on the lens type “0” in a predetermined lens type storage area of the memory map of the RAM 4a (step S6), and ends the memory writing process.

Next, image quality adjustment processing by the imaging apparatus 100 will be described with reference to FIGS.
FIG. 7 is a flowchart illustrating an example of operations related to image quality adjustment processing.

The image quality adjustment process is a process executed after the imaging apparatus 100 is turned on and the memory writing process is performed.
As shown in FIG. 7, the CPU 11 first initializes the distortion correction parameter and the problem parameter (step S21). Specifically, the CPU 11 specifies the zoom stage of the optical zoom mechanism of the zoom lens unit 1 (that is, the position of the zoom adjustment lens 1a in the optical axis direction), and the zoom lens written in the RAM 4a by the memory writing process. Read the lens type of unit 1. Then, the CPU 11 specifies the corresponding distortion correction parameter (see FIG. 4) in the distortion correction data d1 based on the specified zoom stage of the optical zoom mechanism and the read lens type of the zoom lens unit 1. At the same time, the corresponding enlargement parameter (see FIG. 4) in the enlargement data d2 is specified.

  Next, the CPU 11 determines whether or not the optical zoom magnification, that is, the zoom stage of the optical zoom mechanism has been changed at the time of capturing a live view image or a recorded image (step S22). Specifically, the CPU 11 determines the optical zoom magnification based on whether or not a predetermined operation signal related to an instruction to specify the optical zoom magnification is input based on a predetermined operation of the zoom button of the operation input unit 10 by the user. It is determined whether or not it has been changed.

If it is determined in step S22 that the optical zoom magnification has been changed (step S22; YES), the CPU 11 determines a corresponding distortion correction parameter based on the lens type of the zoom lens unit 1 (see FIG. 4). Is changed to the parameter (step S23). Specifically, the CPU 11 performs the corresponding distortion correction in the distortion correction data d1 based on the optical zoom magnification designated by the user, that is, the zoom stage of the optical zoom mechanism and the lens type of the zoom lens unit 1. A parameter (see FIG. 4) is read from the ROM 5 and changed to the parameter.
Next, based on the lens type of the zoom lens unit 1, the CPU 11 reads the corresponding enlargement parameter (see FIG. 4) and changes it to the parameter (step S24). Specifically, the CPU 11 specifies the corresponding enlargement parameter (2) in the enlargement data d2 based on the optical zoom magnification designated by the user, that is, the zoom stage of the optical zoom mechanism and the lens type of the zoom lens unit 1. 4) is read from the ROM 5 and changed to the relevant parameter.

Subsequently, the CPU 11 sets the changed distortion correction parameter (see FIG. 4) in the image correction unit 6a of the image processing unit 6 (step S25), and the changed enlargement parameter (see FIG. 4) as an image. The enlargement processing unit 6b of the processing unit 6 is set (step S26).
Even when it is determined in step S22 that the optical zoom magnification has not been changed (step S22; NO), the CPU 11 shifts the processing to step S25 and, similarly to the above, in step S21. The specified distortion correction parameter and enlargement parameter are set.

Note that, after the distortion correction parameters are changed by the CPU 11 (step S23), the enlargement parameter changing process (step S24) is performed, but the order of the processes is not limited to this, and the order of these processes is not limited. May be reversed.
Further, after the CPU 11 sets the distortion correction parameter for the image correction unit 6a (step S25), the setting process for the enlargement parameter enlargement processing unit 6b (step S26) is performed. However, the processing order is not limited to this. However, the order of these processes may be reversed.

Then, the image correction unit 6a and the enlargement processing unit 6b of the image processing unit 6 perform image quality adjustment on the processing target image based on the distortion correction parameter and the enlargement parameter (step S27). Specifically, the image correction unit 6a performs distortion correction on the image data with the intensity according to the distortion correction parameter, and after cutting out the image data at a rate according to the enlargement parameter, Enlarging processing is performed (see FIG. 8A and the like).
For example, when the zoom lens unit 1 is a lens of the lens type “0”, the image correction unit 6a applies a relatively strong correction strength (correction degree: large) to the image data compared to the lens type “1”. Then, distortion correction is performed, and after the image data is cut out with an enlargement ratio relatively larger than that of the lens type “1”, a process of enlarging the cut out portion is performed (see FIG. 8A). Further, when the zoom lens unit 1 is a lens of the lens type “1”, the design value of the focal length of the lens is shifted to the telephoto side, so that distortion becomes smaller and the angle of view becomes narrower. The image correction unit 6a performs distortion correction on the image data with a relatively weak correction strength (correction degree: small) compared to the lens type “0”, and relative to the lens type “1”. After the image data is cut out with a small enlargement ratio, a process for enlarging the cut out portion is performed (see FIG. 8B).

  Thereafter, the image processing unit 6 outputs the image data subjected to the distortion correction by the image correction unit 6a and the enlargement processing by the enlargement processing unit 6b to the CPU 11 as a processed image (step S28), and then the CPU 11 performs the process. The process proceeds to S22 and the subsequent processing is repeated.

As described above, according to the imaging apparatus 100 of the present embodiment, when the zoom adjustment lens 1a is at a position corresponding to the wide angle end, the lens related to the distortion of the optical image based on the movement of the zoom adjustment lens 1a. Since distortion correction processing for image data and enlargement processing at a predetermined ratio are performed based on the type (optical characteristic information), distortion correction for image data is performed in a plurality of zoom stages of the optical zoom mechanism of the zoom lens unit 1. The zoom stage for performing the process and the process of enlarging at a predetermined ratio can be limited, and the processing burden for distortion correction can be reduced compared to the case where image processing is performed in all of the plurality of zoom stages of the optical zoom mechanism. it can. In particular, in the zoom lens unit 1 of different lens types, as the deviation of the design value from the nominal value toward the telephoto end increases, the specific gravity of the image data enlargement processing in the image processing increases gradually, that is, the specific gravity of distortion correction. By gradually reducing, the processing burden for the distortion correction can be further reduced.
In addition, by performing a process of cutting out and enlarging image data at a predetermined ratio at an optical zoom magnification with a relatively wide angle of view, it is possible to reduce the influence on the composition of the captured image. That is, the image data enlargement ratio is maximized at the wide-angle end (focal length is shortest) side where the angle of view is the widest, and the telephoto side where the angle of view becomes narrower (focal length becomes longer). By reducing the enlargement ratio, it is possible to reduce the influence on the composition of the image.
Furthermore, even if peripheral blurring or vignetting occurs due to a lens assembled in the main body of the apparatus, it can be dealt with by distortion correction or enlargement processing by the image processing unit 6, and a zoom lens with poor optical performance is not produced. Thus, the productivity of the imaging apparatus 100 can be improved.

Further, since at least one of the content of the distortion correction by the image correction unit 6a and the ratio of the enlargement processing by the enlargement processing unit 6b is stored in association with the lens type of the zoom lens unit 1, the imaging is performed. In accordance with the lens type of the zoom lens unit 1 attached to the main body of the apparatus 100, it is possible to set a predetermined ratio of distortion correction processing and enlargement processing for image data.
That is, based on the lens type of the zoom lens unit 1, the CPU 11 can read and set the distortion correction parameters when the zoom adjustment lens 1 a is at a position corresponding to the wide-angle end and set it in the image correction unit 6 a. Based on the lens type, the enlargement parameter when the zoom adjustment lens 1a is at a position corresponding to the wide-angle end can be read and set in the enlargement processing unit 6b. The image correction unit 6a can perform distortion correction on the image data with an intensity according to the set distortion correction parameter, and the enlargement processing unit 6b can perform a ratio according to the set enlargement parameter. After the image data is cut out by the above, processing for enlarging the cut out portion can be performed.
Thereby, a zoom lens whose design value is deviated toward the telephoto end side with respect to the nominal value of the focal length, that is, a lens type outside the allowable range for the focal length at the wide angle end (for example, the nominal value of the focal length ± 5%) Even in the zoom lenses “1” to “3”, the distortion correction process for image data and the process of enlarging at a predetermined ratio are performed for each lens type of the zoom lens unit 1 attached to the imaging apparatus 100 main body. Therefore, it is possible to improve the productivity of the imaging apparatus 100 without using a zoom lens with poor optical performance.

The present invention is not limited to the above-described embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
For example, when the lens manufacturing and the imaging device 100 are manufactured at different vendors or places, the lens type associated with the lens when the delivered lens is assembled to the apparatus main body by the image quality adjustment system 300. The setting device 200 (to be described later) reads the information related to the CPU 11 of the imaging device 100 to set the distortion correction parameter corresponding to the lens type and to set the enlargement parameter corresponding to the lens type. (See FIG. 9).

As illustrated in FIG. 9, the image quality adjustment system 300 includes an imaging device 100 and a setting device 200 connected to the imaging device 100. The setting device 200 is installed in, for example, a manufacturing factory of the imaging device 100, and includes a lens type reading unit 201, a processing content setting unit 202, and an external communication unit 203. Via the external communication unit 12 of the imaging device 100.
In FIG. 9, the imaging apparatus 100 is schematically shown, and the configuration other than the provision of the external communication unit 12 is substantially the same as that of the above embodiment, and thus detailed description thereof is omitted.

The lens type reading unit 201 includes, for example, a scanner and reads information related to a lens type associated with a delivered zoom lens.
For example, information on the lens type specified at the time of manufacturing the zoom lens is converted into a barcode (one-dimensional code) or two-dimensional code and printed on a predetermined information recording medium (not shown). Delivered with the zoom lens. The lens type reading unit 201 optically reads and acquires information on the lens type from a predetermined information recording medium.
Here, the lens type reading unit 201 constitutes reading means for reading recorded information relating to the lens type associated with the zoom lens from the information recording medium.

The processing content setting unit 202 transmits information regarding the lens type to the imaging apparatus 100 via the external communication unit 203 to set a distortion correction parameter and an enlargement parameter to be read from the ROM 5.
Specifically, the processing content setting unit 202 includes a predetermined communication line (not shown) between an external communication unit 203 (for example, a communication connector) and an external communication unit 12 (for example, a corresponding communication connector) of the imaging apparatus 100. ), Information relating to the lens type read by the lens type reading unit 201 is transmitted to the imaging device 100 via the external communication unit 203, and distortion correction is performed on the CPU 11 of the imaging device 100. In the data for data d1, a distortion correction parameter (see FIG. 4) corresponding to the lens type is set, and in the data for enlargement d2, an expansion parameter (see FIG. 4) corresponding to the lens type is set. .
Thereafter, the CPU 11 of the imaging apparatus 100 reads the set distortion correction parameters (see FIG. 4) and sets them in the image correction unit 6a, and also reads the set enlargement parameters (see FIG. 4) to enlarge the processing unit. Set to 6b.

Thereby, in the imaging device 100, the image correction unit 6a can perform distortion correction on the image data with an intensity according to the set distortion correction parameter, and the enlargement processing unit 6b After the image data is cut out at a rate corresponding to the enlarged enlargement parameter, a process of enlarging the cut out portion can be performed.
Therefore, similarly to the above-described embodiment, for each lens type of the zoom lens unit 1 attached to the main body of the imaging apparatus 100, it is possible to perform a distortion correction process for image data and a process for enlarging at a predetermined ratio, and a focal length. Even if the zoom lens has a design value shifted to the telephoto end side with respect to the nominal value, the productivity of the imaging apparatus 100 can be improved.
Further, it is not necessary to perform the writing process to the lens type RAM 4a of the zoom lens unit 1 in the memory writing process at the time of turning on the power, and the startup time of the imaging apparatus 100 is reduced, so that the imaging apparatus 100 that is more convenient to use can be obtained. Can be provided.

In the image quality adjustment system 300, the distortion correction parameter and the enlargement parameter to be read from the ROM 5 are set based on the information on the lens type. However, the present invention is not limited to this. Information related to this may be written in a predetermined lens type storage area of the memory map of the flash memory 4b under the control of the CPU 11 of the imaging apparatus 100. In this case, as in the above embodiment, the CPU 11 of the imaging apparatus 100 writes information on the lens type in the RAM 4a, and then reads out the distortion correction parameter and the enlargement parameter corresponding to the lens type from the ROM 5. It has become.
Further, instead of information on the lens type, information on the design value may be converted into a form such as a barcode (one-dimensional code) or a two-dimensional code and printed on a predetermined recording medium. Information on a design value is optically read using a reading device (not shown), a lens type is specified based on the design value among a plurality of lens types, and the specified lens type is stored in a lens type storage area. You may make it write in.

Furthermore, in the above embodiment, the zoom lens unit 1 may be configured to be detachable from the main body of the imaging apparatus 100. In this case, for example, optical characteristic information (lens type) related to distortion of the optical image based on the movement of the zoom adjustment lens 1a is stored in a storage means (not shown) in the zoom lens unit 1. Then, in a state where the zoom lens unit 1 is attached to the mount (not shown) of the apparatus main body, the CPU 11 may write to the lens type storage area of the memory map of the flash memory 4b via the signal contact of the mount. Alternatively, a distortion correction parameter corresponding to the lens type is set in the distortion correction data d1, and an enlargement parameter corresponding to the lens type is set in the expansion data d2. Also good.
Accordingly, even if peripheral blurring or vignetting occurs depending on the interchangeable lens, it can be dealt with by distortion correction or enlargement processing by the image processing unit 6, and an interchangeable lens with poor optical performance is not produced.

In the above embodiment, the ratio of distortion correction by the image correction unit 6a and enlargement processing by the enlargement processing unit 6b may be varied according to the lens position in the optical axis direction of the zoom adjustment lens 1a. . At this time, the ratio between the distortion correction by the image correction unit 6a and the enlargement processing by the enlargement processing unit 6b is variable between 0 and 100, and the image to be processed by the image processing unit 6 as in the above embodiment. On the other hand, both the distortion correction by the image correction unit 6a and the enlargement processing by the enlargement processing unit 6b may be performed, or one of the processes may be performed.
For example, when the design value of the focal length of the lens shifts to the telephoto side with respect to the nominal value, the distortion aberration becomes smaller and the angle of view becomes narrower. Since an image with relatively little distortion can be obtained without correction, the ratio of the enlargement processing by the enlargement processing unit 6b is made larger than the distortion correction by the image correction unit 6a. On the other hand, when the design value of the focal length of the lens is shifted to the wide angle side with respect to the nominal value, it is possible to secure a wider angle of view as compared with the nominal value. Since it may be better to deal with distortion correction by the image correction unit 6a, the ratio of distortion correction by the image correction unit 6a is made larger than the enlargement processing by the enlargement processing unit 6b.
Note that in the case where any one of distortion correction by the image correction unit 6a and enlargement processing by the enlargement processing unit 6b is performed, the ROM 5 stores the distortion used in the image quality adjustment processing by the image processing unit 6. Any one of the correction parameters and the enlargement parameters may be stored.

  In addition, the configuration of the imaging apparatus 100 is merely an example illustrated in the above embodiment, and is not limited thereto.

In addition, in the above embodiment, the functions as the correction unit, the enlargement processing unit, and the output unit are realized by driving the image processing unit 6 under the control of the CPU 11. The present invention is not limited to this, and a configuration realized by executing a predetermined program or the like by the CPU 11 may be adopted.
In other words, a program including a correction processing routine, an enlargement processing routine, and an output control processing routine is stored in a program memory (not shown) that stores the program. Then, according to the correction processing routine, the CPU 11 corrects the image information output from the electronic imaging unit 2 when the optical element is at a specific position according to the optical characteristic information related to the distortion of the optical image based on the movement of the optical element. You may make it function as a correction means to do. Further, the enlargement processing routine causes the CPU 11 to function as enlargement processing means for enlarging the image information output from the electronic imaging unit 2 at a predetermined rate when the optical element is at a specific position according to the optical characteristic information. May be. Further, the output control processing routine causes the CPU 11 to function as output control means for outputting image information subjected to at least one of correction by the correction means and enlargement processing by the enlargement processing means as a processed image. Also good.

  Furthermore, as a computer-readable medium storing a program for executing each of the above processes, a non-volatile memory such as a flash memory or a portable recording medium such as a CD-ROM is applied in addition to a ROM or a hard disk. Is also possible. A carrier wave is also used as a medium for providing program data via a predetermined communication line.

DESCRIPTION OF SYMBOLS 100 Imaging device 1 Zoom lens part 1a Zoom adjustment lens 2 Electronic imaging part 3 CDS / ADC part 5 ROM
6 Image processing unit 6a Image correction unit 6b Enlargement processing unit 11 CPU
200 Setting Device 201 Lens Type Reading Unit 202 Processing Content Setting Unit 300 Image Quality Adjustment System d1 Distortion Correction Data d2 Enlargement Data

Claims (7)

Imaging means for converting an optical image that has passed through the optical element into image information and outputting the image information;
According to the optical characteristic information related to the distortion of the optical image based on the movement of the optical element, the image information output from the imaging unit when the optical element is at a specific position is corrected, or from the imaging unit Control means for controlling to perform at least one of enlargement processing of output image information at a predetermined ratio;
Output means for outputting image information processed by the control means or image information output from the imaging means and not controlled by the control means when the optical element is not at a specific position as a processed image When,
An imaging apparatus comprising: Further comprising storage means for storing the control content by the control means and the optical characteristic information in association with each other;
2. The control unit according to claim 1, wherein the control unit reads out at least one of correction contents and a ratio of enlargement processing when the optical element is at a specific position based on the optical characteristic information from the storage unit. Imaging device. The optical element includes a zoom adjustment lens constituting an optical zoom mechanism,
The imaging apparatus according to claim 2, wherein the specific position is a position where a lens position of the zoom adjustment lens corresponds to a wide angle end.   The imaging apparatus according to claim 3, wherein at least one of a correction content by the control unit or a ratio of enlargement processing is varied according to a lens position of the zoom adjustment lens. An image quality adjustment system that adjusts the image quality of an image captured by the imaging apparatus according to claim 2 ,
The optical characteristic information is represented by recording information recorded on an information recording medium associated with the optical element,
Reading means for reading the recorded information from the information recording medium;
Based on the recording information read by the reading means, setting means for setting at least one of the correction content to be read from the storage means or the ratio of the enlargement processing in the imaging device;
An image quality adjustment system comprising: An imaging method using an imaging device including an imaging means for converting an optical image that has passed through an optical element into image information and outputting the image information,
Processing for correcting image information output from the imaging means when the optical element is at a specific position in accordance with optical characteristic information related to distortion of an optical image based on movement of the optical element, and the optical characteristic information And performing at least one of the processes of enlarging the image information output from the imaging means at a predetermined rate when the optical element is at a specific position;
Image information that has been subjected to at least one of processing for correcting image information and processing for enlarging image information , or processing that is output from the imaging means and corrected when the optical element is not at a specific position And outputting image information that has not been subjected to processing for enlargement at a predetermined ratio as a processed image;
The imaging method characterized by performing. A computer of an imaging apparatus comprising imaging means for converting an optical image that has passed through an optical element into image information and outputting the image information,
Correction means for correcting image information output from the imaging means when the optical element is at a specific position in accordance with optical characteristic information related to distortion of an optical image based on movement of the optical element;
An enlargement processing means for enlarging the image information output from the imaging means at a predetermined rate when the optical element is at a specific position according to the optical characteristic information;
Image information subjected to at least one of correction by the correction unit and enlargement processing by the enlargement processing unit , or output from the imaging unit when the optical element is not at a specific position, and the correction unit and Output control means for outputting image information not processed by the enlargement processing means as a processed image;
A program characterized by functioning as

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