JP7380771B2 - Projection control device, projection device, projection control method and program - Google Patents

Description

The present invention relates to a projection control device, a projection device, a projection control method, and a program.

In order to provide an environment-adaptive image display system, etc., a technology that corrects colors to increase the output of at least the low gradation range and corrects the brightness when there is an influence of environmental light. is proposed. (For example, Patent Document 1)

Japanese Patent Application Publication No. 2002-125125

In the technology described in the above patent document, by setting a period during which primary color light such as white is projected and measuring the reflected light when the primary color light is projected onto a screen using a color light sensor, the influence of environmental light on the projected image is determined. is being calculated. However, it is difficult to imagine that the above primary color light projection operation would be performed by interrupting the previous operation while actually selecting and projecting some kind of video signal, such as a video for a presentation. This is considered to be an operation that should be performed as an initial setting when installing the device. Therefore, it is difficult to respond immediately in situations where the influence of environmental light changes, such as in installation locations that are affected by external light.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a projection control device and a projection device that can adapt to changes in environmental light and maintain projection operation with high image quality. , to provide a projection control method and program.

A projection control device according to one aspect of the present invention includes an image signal acquisition unit that acquires an image signal, and a projection unit that projects an image, and is configured to project an image according to the image signal acquired by the image signal acquisition unit. a projection control means for controlling; a first brightness acquisition means for acquiring first brightness information including average brightness information within an image plane according to an image signal acquired by the image signal acquisition means; an imaging means for capturing an image of the projection surface including the normal image projected by the projection section at each preset acquisition timing; and an imaging means for capturing an image of the projection surface including the normal image projected by the projection section; a second brightness acquisition means for acquiring second brightness information including average brightness information from the image captured by the image pickup means; and a contrast value before acquiring the second brightness information. is stored, the first brightness information, and the second brightness information at the lowest brightness gradation obtained from the first brightness information. A first average value of illuminance obtained from second brightness information corresponding to the brightness information, and the first brightness information at the highest brightness gradation obtained from the first brightness information. a second average value of illuminance obtained from second brightness information corresponding to , and calculate an estimated contrast value based on the first average value and the second average value , Projection condition setting means for changing and setting projection conditions in the projection unit according to a comparison result between the estimated contrast value and a contrast value stored in a memory before acquiring the second brightness information; , is provided.

According to the present invention, it is possible to maintain projection operation with high image quality while adapting to changes in environmental light.

FIG. 1 is a block diagram showing a functional configuration of an electronic circuit of a projector device according to an embodiment of the present invention. 7 is a flowchart showing the contents of processing executed in parallel during the projection operation according to the embodiment. FIG. 7 is a diagram showing the relationship between the average brightness of an input image signal, the average illuminance on a projection plane, and estimated contrast according to the same embodiment.

An embodiment in which the present invention is applied to a projector device will be described in detail below with reference to the drawings.
FIG. 1 is a block diagram mainly showing the functional configuration of an electronic circuit of a DLP (registered trademark) (Digital Light Processing) type projector device 10 according to the present embodiment. In the figure, the input processing unit 21 includes, for example, a pin jack (RCA) type video input terminal, a D-sub15 type RGB input terminal, an HDMI (registered trademark) (High-Definition Multimedia Interface) terminal, and a USB (Universal Serial Bus) terminal. ) consists of terminals, etc.

Analog or digital image signals of various standards that are input to the input processing unit 21 or stored in a USB memory and selectively read out are digitized as necessary by the input processing unit 21 and then transferred to the system bus. It is sent to the projection image drive section 22 via SB. The projection section PJ includes the projection image drive section 22, a micromirror element 23, a light source section 24, a mirror 25, a projection lens section 26, and a lens motor (M) 27.

The projection image driving unit 22 adjusts the frame rate according to a predetermined format according to the sent image data, for example, if the input image data is 60 [Hz], the color component is set to 120 [frames/second]. The micromirror element 23, which is a display element, is driven for display by faster time division driving multiplied by the number of divisions and the number of display gradations.

The micromirror element 23 performs a display operation by turning on and off each tilt angle of a plurality of micromirrors arranged in an array, for example, 1280 pixels horizontally x 960 pixels vertically (aspect ratio 4:3) at high speed. By doing so, an optical image is formed by the reflected light.

On the other hand, primary color lights of R, G, and B are cyclically emitted from the light source section 24 in a time-division manner. The light source section 24 has an LED (light emitting diode) that is a semiconductor light emitting element, and repeatedly emits R, G, and B primary color light in a time-division manner. The LED included in the light source section 24 may be an LED in a broad sense, and may include an LD (semiconductor laser) or an organic EL element. The primary color light from the light source section 24 is totally reflected by the mirror 25 and irradiated onto the micromirror element 23 .

Then, an optical image is formed by the reflected light from the micromirror element 23, and the formed optical image is projected to the outside via the projection lens section 26 and displayed on the projection target surface.

The projection lens unit 26 includes, in its internal lens optical system, a focus lens for moving the focus position and a zoom lens for varying the zoom (projection) angle of view, and each lens is driven by a lens motor (M). 27 selectively drives the position along the optical axis direction via a gear mechanism (not shown).

On the other hand, the present projector device 10 is provided with a photographing section IM that photographs the projection direction by the projection lens section 26. This photographing section IM has a photographing lens section 28. This photographing lens section 28 includes a zoom lens for varying the photographing angle of view and a focus lens for moving the focus position, and is configured to be connected to the projection section PJ so that the image projected by the projection section PJ can be photographed. In consideration of the parallax, the imaging angle of view is slightly larger than the projection angle of view that is emitted when the projection lens section 26 is set to the widest angle. An external light image that enters the photographing lens unit 28 is formed on a CMOS image sensor 29 that is a solid-state image sensor.

An image signal obtained by imaging with the CMOS image sensor 29 is digitized by an A/D converter 30 and then sent to a photographed image processing section 31.

This photographed image processing section 31 scans and drives the CMOS image sensor 29 to execute a photographing operation, and performs image processing on the image data obtained by photographing, thereby extracting a projection range by the projection section PJ and extracting the extracted image. Calculation of the average illuminance (second brightness information) within the projection range is executed. In addition, the photographed image processing section 31 drives a lens motor (M) 32 for moving the focus lens position of the photographic lens section 28.

The CPU 33 controls all operations of the above-mentioned circuits. This CPU 33 is directly connected to a main memory 34 and a program memory 35. The main memory 34 is composed of, for example, an SRAM, and functions as a work memory for the CPU 33. The program memory 35 is composed of an electrically rewritable non-volatile memory, such as a flash ROM, and stores various types of standard data such as operation programs executed by the CPU 33 and images for OSD (On Screen Display) to be superimposed on the base image. remember.

The CPU 33 reads out operating programs, standard data, etc. stored in the program memory 35, develops and stores them in the main memory 34, and executes the programs, thereby controlling the projector device 10 in an integrated manner. do.

The CPU 33 executes various projection operations in response to operation signals from the operation section 36. This operation section 36 includes a light receiving section that receives an infrared modulated signal from an operation key provided on the main body casing of the projector device 10 or a remote controller (not shown) dedicated to this projector device 10, and receives the key operation signal. A signal corresponding to the key operation signal is sent to the CPU 33.

The CPU 33 is further connected to the audio processing section 37 via the system bus SB.
The audio processing section 37 includes a sound source circuit such as a PCM sound source, converts the audio signal given during the projection operation into an analog signal, drives the speaker section 38 to emit sound, or generates a beep sound or the like as necessary.

[motion]
Next, the operation of the above embodiment will be explained.
In addition, in the initial setting of the projection operation, the user of the projector device 10 operates the zoom lens in the projection lens section 26 of the projection section PJ to set a desired projection angle of view, and also sets a desired projection angle of view on a screen (not shown) to be projected. Alternatively, it is assumed that an autofocus instruction on the curtain is operated in advance.

By moving the zoom lens of the photographing lens section 28 of the photographing section IM in conjunction with the operation of the zoom lens of the projection lens section 26 of the projection section PJ, the range of the projected image by the projection section PJ is ensured. The photographing angle of view of the photographing lens section 28 is set so as to cover the entire distance, and the distance from the position of the focus lens to the object to be projected is determined by the autofocus operation of the photographed image by driving the focus lens of the photographing lens section 28. can be obtained.

Therefore, after setting the position of the focus lens on the projection lens unit 26 side of the projection unit PJ at the same distance, finely adjust the position of the focus lens of the projection lens unit 26 while monitoring the captured image by the imaging unit IM. This enables accurate autofocus adjustment of projected images.

FIG. 2 shows the luminance of light emitted by the LEDs for each primary color light of the light source unit 24 and the micromirror elements, which are executed in parallel with the projection operation according to the image signal input to the input processing unit 21 in the projector device 10. 23 is a flowchart showing the details of a process for setting the light emission brightness at the projection unit PJ by adjusting the gradation of the image displayed at step 23. FIG.

This setting process of the light emission brightness in the projection section PJ is executed by the CPU 33, the photographed image processing section 31 of the photographing section IM, which operates under the control of the CPU 33, and the projection image driving section 22 of the projection section PJ.

At the beginning of processing, the CPU 33 determines that the number of image frames counted is a multiple of 120 at a preset acquisition timing, for example, if the frame rate of the image signal input to the input processing unit 21 at that time is 120 [frames/second]. By repeatedly determining whether or not the acquisition timing has reached once every 1 second, it waits for the timing to occur (step S101).

When it is determined that the above acquisition timing has come (Yes in step S101), the CPU 33 causes the photographed image processing section 31 of the photographing section IM to photograph a range including the projection image, and projects from the photographed image by the projection section PJ. A region of the projected image corresponding to the image pattern is extracted (step S102).

Next, the CPU 33 determines whether the automatic light control function is set to on at that time (step S10 3 ). If it is determined that the automatic light control function is not set to on but is set to off (No in step S103 ), the CPU 33 cancels the subsequent processing and repeats the processing from step S101 above. Return to

Further, in step S103 above, if it is determined that the automatic light adjustment function is set to ON (Yes in step S103 ), the CPU 33 causes the photographed image processing unit 31 to photograph the projection plane again, and The image data of the projection area is extracted from the image data by pattern recognition processing with the image data being projected by the projection unit PJ at that time and by extracting a substantially rectangular distribution area with higher illuminance than the surrounding area. Acquire (step S104).

Paragraph [0018]
The CPU 33 uses the captured image processing unit 31 to calculate the illuminance (second brightness information) of all the pixels constituting the image data of the extracted projection area, and then integrates the gradation values of the illuminance of all the pixels. Then, the average value of illuminance is calculated by dividing by the number of pixels.

In addition, the CPU 33 causes the projection image drive unit 22 to calculate the average gradation value (first brightness information) of the brightness of all pixels of the image data being projected at that time, and the It is determined whether the average gradation value of the illuminance of the projection area calculated above is valid as a sample, based on whether it is dispersed by a certain value or more with the average gradation value of the other luminances calculated up to now (step S105). .

The point of determining the average gradation value of the luminance of the projected image will be explained. When the image data to be projected is composed of all n pixels, the CPU 33 uses the projection image drive unit 22 to calculate the luminance gradation value Yi at the i (i=1 to n) pixel using a general luminance matrix calculation. Yi=0.2988Ri+0.5868Gi+0.1144Bi
(However, Yi: the luminance value of the i-th pixel,
Ri, Gi, Bi: R, G, B values of the i-th pixel. )
Calculated as Under the control of the CPU 33, the projection image drive section 22 calculates the average gradation value of the brightness of the image being projected by dividing the sum of the brightness of all n pixels by the number of pixels n.

Paragraph [0018]
The average value of the illuminance of the projection area calculated by the photographed image processing unit 31 is also calculated by calculating the gradation value Ii of the illuminance of each photographed pixel using the same formula as the brightness matrix calculation described above, and then calculating the total illuminance of all pixels. is divided by the number of pixels to calculate the average value of the illuminance of the projection area.

FIG. 3 is a diagram illustrating the relationship between the average gradation value of the brightness of all pixels of the image input to the projection unit PJ and the average value of the illuminance of the projection area calculated from the projection result.

In the same figure, the average gradation value of the brightness of all pixels of the input image is shown in the range of "0" to "255" corresponding to 8 bits. Considering the environmental light, the average gradation value of the brightness is " The average value of illuminance on the projection surface is I0 when an image is projected where the entire screen is black, and the average gradation value of luminance is ``255'', when an image where the entire screen is white is projected. The average value of illuminance on the projection plane in this case is indicated by If. As shown by the plotted position of the black dot, the actual average value of illuminance is obtained by obtaining as wide and dispersed samples as possible within the range of the minimum value I0 and the same maximum value If of the average value of illuminance. As shown by the linear equation "y=f(x)", the relationship between the brightness of the input image and the illuminance on the projection plane according to the projection environment can be estimated with higher accuracy.

The CPU 33 causes the projection image driving unit 22 to calculate the average gradation value of the brightness of all pixels of the image being projected at that time, and also calculates the average value of the illuminance of the projection area from the photographed image processing unit 31 as described above. Have it calculated. The CPU 33 determines that the set of the average gradation value of the luminance of the input image and the average value of the illuminance of the projection area in the captured image is a value that is appropriately different from other sets of the same average gradation value that have already been calculated. For example, whether one calculated value is obtained for every "30" gradation within the average gradation value of "0" to "255" of the luminance of the input image, the calculated average It is determined whether the set of tone values is valid as a sample.

If it is determined that the set of calculated average gradation values is not valid as a sample (No in step S105), the set of calculated average gradation values is located in the immediate vicinity of the black point position already plotted in FIG. 3 above. Therefore, the CPU 33 invalidates the set of average gradation values and returns to the process from step S104 to obtain the next sample.

Further, in step S105, if it is determined that the set of calculated average gradation values is valid as a sample (Yes in step S105), the CPU 33 calculates the average gradation value of the luminance of the input image and the projection area in the captured image. The set of average illuminance values is held and set as valid plot data in FIG. 3 (step S106).

Thereafter, the CPU 33 determines whether the number of samples has reached a preset specified number, for example "10" (step S107). If it is determined that the number of samples has not reached the specified number (No in step S107), the CPU 33 returns to the process from step S104 to obtain more samples.

Further, in step S107, if it is determined that the number of samples has reached the specified number (Yes in step S107), the CPU 33 calculates the average gradation value of the luminance of the input image and the illuminance of the projection area in the photographed image based on the sample result. An approximate expression is calculated by approximating the correlation between the average values using linear approximation or other functions (step S108).

Note that if the correlation between the average gradation value of the luminance of the input image and the average value of the illuminance of the projection area in the captured image is not linear due to the influence of gamma correction, etc., the CPU 33 acquires the correction information in advance. By doing so, it becomes possible to obtain an approximation equation by linear approximation by correcting the average gradation value of the luminance of the input image using the correction information.

The CPU 33 uses the calculated approximate formula to estimate the average value I0 of the illuminance at the brightness gradation "0" in FIG. 3 and the average value If of the illuminance at the brightness gradation "255" in FIG. The current contrast value is estimated (step S109).

Then, it is determined whether the contrast value as the estimation result is outside a preset allowable contrast value range (step S110).

Specifically, by comparing the contrast value of the estimation result with the numerical range of the permissible contrast value range stored in advance in the program memory 35, it is possible to determine whether the contrast value as the estimation result is the same as that set in advance. Determine whether the contrast value is outside the allowable range.

If the CPU 33 determines that the contrast value as the estimation result is not outside the preset tolerance range for contrast values and is within the tolerance range (No in step S110), the CPU 33 does not need to adjust the contrast. Then, the process returns to step S101 and waits for the next acquisition timing.

Further, in step S110, if it is determined that the contrast value as the estimation result is out of the permissible contrast value range set in advance ( Yes in step S110), then the CPU 33 Since the light emission brightness is low, it is determined whether the contrast value is below the above-mentioned allowable range (step S111).

If it is determined that the luminance of light emitted by the projection unit PJ at that time is low and the contrast value is below the above-mentioned allowable range (Yes in step S111), the CPU 33 determines the drive current value of each LED in the light source unit 24 of the projection unit PJ. After increasing the luminance of the LEDs by a certain value (step S112), the process returns to step S101 and waits for the next acquisition timing.

Further, in step S111, if it is determined that the luminance of light emitted by the projection unit PJ at that time is not low and the contrast value is not below the above-mentioned allowable range (No in step S111), Since the light emission brightness is high and the contrast value exceeds the above-mentioned allowable range, the CPU 33 lowers the drive current value of each LED in the light source section 24 of the projection section PJ to lower the light emission brightness of those LEDs by a certain value. After making the update settings (step S113), the process returns to step S101 and waits for the next acquisition timing.

Note that in steps S122 and S123, the update setting is performed to adjust the luminance of each LED in the light source unit 24 to be increased or decreased by a certain value, but the present embodiment is not limited to this, and the estimation results are Basically, the luminance of light emitted by the light source section 24 is processed in only one adjustment operation so that the contrast value is the same as that of the projection mode set at that time. Also good.

In the above embodiment, after calculating the approximate formula using linear approximation to calculate the correlation between the average gradation value of the luminance of the input image and the average value of the illuminance of the projection area, the illuminance at the luminance gradation of "0" is calculated. Although the configuration is configured to estimate the average value I0 of the illuminance and the average value If of the illuminance at the luminance gradation of "255", the present invention is not limited to this, and the estimation can be performed by estimating only the value at the luminance gradation of "0". The influence of environmental light may be estimated from the average value I0.

With this configuration, when the average value I0 is lower than the reference value, it is determined that the projection target is less affected by environmental light and has a sufficiently high contrast ratio, and processing to lower the luminance of the light source 24 is performed. By doing so, it is possible to suppress the amount of power consumed in the light source section 24 while ensuring a sufficient contrast ratio. Further, when the average value I0 is higher than the reference value, processing may be performed to increase the luminance of light emitted from the light source section 24, and control may be performed so that the contrast ratio approaches an ideal value.

With the above configuration, the contrast ratio can be easily calculated without performing the process of estimating the average value If at the brightness gradation level "255" or the process of calculating the estimated contrast ratio using the average value I0 and the average value If. optimization and reduction of the amount of power consumed by the light source section 24.

In the above embodiment, a plurality of sample points are acquired in order to estimate the correlation between the average luminance gradation value of the input image and the average illuminance value of the projection area, but the present invention is not limited to this. .

For example, a configuration is configured in which the average gradation value of the brightness of the input image is calculated in advance, and only the average illuminance value of the projection area when the input image whose average gradation value is the lowest in the entire input image is projected is acquired. You may do so. Based on the relationship between the acquired average illuminance value of the projection area and a predetermined reference value, the processing described in the above-described modification is performed.

With this configuration, the number of samples to be acquired can be reduced, and environmental light can be easily calculated without estimating the correlation between the average luminance gradation value of the input image and the average illuminance value of the projection area. Impact can be estimated.

In addition, in order to detect changes in environmental light, processing is performed at predetermined intervals to obtain the average value of the illuminance of the projection area at the timing when the average gradation value of the brightness of the input image takes a specific value. Also good.

By acquiring the average value of illuminance of the projection area at predetermined intervals, it is possible to detect changes in environmental light from changes in the average value of illuminance. If a change is detected, the luminance of the light source 24 may be changed in accordance with the amount of change in the average illuminance value , and control may be performed to bring the contrast ratio closer to an ideal value. Further, when a change is detected, the contrast correction process described in this embodiment may be performed from the beginning.

Further, in the embodiment described above, the contrast ratio is adjusted by adjusting the output of the light source section 24, but the present invention is not limited to this. For example, the contrast ratio may be adjusted by driving a zoom lens included in the projection device to narrow the projection angle of view and increasing the average gradation value If. In addition, if the contrast ratio is lower than the reference value and the projection device is in a power-saving projection mode such as eco mode at that time, change to the normal projection mode and adjust the average gradation value If. The contrast ratio may be adjusted by increasing the contrast ratio.

Furthermore, in the embodiment described above, the above operation is executed every cycle when one frame of the projected image is reached as the preset acquisition timing, but the cycle can also be set arbitrarily by the user of the projector device 10. good.

Further, in the above embodiment, the average brightness is acquired from the photographed image, but the brightness information of the projection plane may be acquired using an illumination meter installed on the projection plane.

[effect]
As described in detail above, according to the present embodiment, it is possible to maintain projection operation with high image quality while adapting to changes in environmental light.

Furthermore, in the above embodiment, the projector device 10 incorporates the imaging unit IM together with the projection unit PJ, and the projection area including the projected image is acquired by the imaging unit IM within the device. Projection operations with higher image quality can be maintained more accurately without the need to connect and install an external imaging device such as a digital camera.

Further, in the embodiment described above, since the region of the projection surface is extracted from the captured image and the average illuminance within the region is acquired, the average illuminance in the projection region can be acquired with higher accuracy.

In addition, in the embodiment described above, the average brightness of all pixels constituting one frame of the image to be projected is calculated and acquired, so the average brightness in the projected area can be acquired with higher accuracy.

Although not explained in the above embodiment, depending on the type of input image signal, information on the average brightness of each frame of the image may be added as supplementary information in advance. When inputting an image signal, the burden required for arithmetic processing can be further reduced by effectively utilizing the added average luminance information.

Furthermore, in the above embodiment, the projection conditions can be changed and set after estimating the contrast of the projected image with higher accuracy based on the contents of multiple sets of the acquired average brightness gradation value and average illuminance. can.

In addition, regarding the contents of the multiple sets of average brightness gradation values and average illuminance obtained above, the validity of the information was determined and the necessary multiple sets of information were secured, so the It is possible to maintain a high level of accuracy when estimating contrast.

Although the above embodiment has been described in the case where it is applied to a DLP (registered trademark) type projector device that uses an LED as a light source element, the present invention is not limited to the light source element or the projection method, etc. For example, it can be similarly applied to a color liquid crystal projection device using a high-pressure mercury lamp.

Furthermore, the present invention can be applied not only to projection devices but also to various display devices having, for example, flat panel displays or their control devices, in which the display state of images changes depending on the surrounding environment, etc. shall be.

In addition, the present invention is not limited to the above-described embodiments, and various modifications can be made at the implementation stage without departing from the gist thereof. Moreover, each embodiment may be implemented by appropriately combining them as much as possible, and in that case, the combined effects can be obtained. Further, the embodiments described above include inventions at various stages, and various inventions can be extracted by appropriately combining the plurality of disclosed constituent elements. For example, even if some constituent features are deleted from all the constituent features shown in the embodiments, the problem described in the column of problems to be solved by the invention can be solved, and the effect described in the column of effects of the invention can be achieved. If this is obtained, a configuration in which this component is deleted can be extracted as an invention.

Below, the invention described in the original claims of the present application will be added.
[Claim 1]
an image signal acquisition means for acquiring an image signal;
a projection control means for controlling a projection unit that projects an image to project an image according to an image signal acquired by the image signal acquisition means;
a first brightness acquisition means for acquiring first brightness information including average brightness information within an image plane according to the image signal acquired by the image signal acquisition means;
a second brightness acquisition unit that acquires second brightness information including average brightness information on a projection surface projected by the projection unit;
Projection condition setting means for changing and setting projection conditions in the projection unit based on the first brightness information and the second brightness information;
A projection control device comprising:
[Claim 2]
2. The projection control device according to claim 1, wherein the second brightness information is information acquired from a projection surface onto which an image corresponding to the first brightness information is projected.
[Claim 3]
further comprising an imaging means for imaging the projection surface including the image projected by the projection unit,
The second brightness acquisition means acquires second brightness information including average brightness information from the image of the projection surface taken by the imaging means.
A projection control device according to claim 1 or 2.
[Claim 4]
The second brightness acquisition means extracts a projection range from the image of the projection surface taken by the imaging means, and then acquires second brightness information including average brightness information within the corresponding range. 4. The projection control device according to claim 3.
[Claim 5]
2. The first brightness acquisition means acquires first brightness information including average brightness information of all pixels constituting one frame of the image signal acquired by the image signal acquisition means. 5. The projection control device according to any one of 4 to 4.
[Claim 6]
The image signal acquisition means acquires an image signal including average brightness information,
The first brightness acquisition means acquires first brightness information including average brightness information included in the image signal acquired by the image signal acquisition means.
A projection control device according to any one of claims 1 to 3.
[Claim 7]
The projection condition setting means includes first brightness information including average brightness information acquired by the first brightness acquisition means and second brightness information including average brightness information acquired by the second brightness acquisition means. 7. The projection control device according to claim 1, wherein projection conditions in said projection unit are changed and set based on the contents of a plurality of sets of second brightness information.
[Claim 8]
The projection condition setting means includes first brightness information including average brightness information acquired by the first brightness acquisition means and second brightness information including average brightness information acquired by the second brightness acquisition means. 8. The projection control according to claim 7, wherein the validity of the information forming the second set of brightness information is determined, and the projection conditions in the projection unit are changed and set based on the plurality of sets of information determined to be valid. Device.
[Claim 9]
A projection device comprising the projection control device according to any one of claims 1 to 8 and the projection section.
[Claim 10]
an image signal acquisition step of acquiring an image signal;
a projection control step of controlling a projection unit that projects an image to project an image according to the image signal acquired in the image signal acquisition step;
a first brightness acquisition step of acquiring first brightness information including average brightness information within the image plane according to the image signal acquired in the image signal acquisition step;
a second brightness acquisition step of acquiring second brightness information including average brightness information on the projection surface projected by the projection unit;
a projection condition setting step of changing and setting projection conditions in the projection unit based on the first brightness information and the second brightness information;
A projection control method having.
[Claim 11]
A built-in device includes an image signal acquisition section that acquires an image signal, and a projection control section that controls the projection section that projects an image to project an image according to the image signal acquired by the image signal acquisition section. A program executed by a computer, which causes the computer to
a first brightness acquisition unit that acquires first brightness information including average brightness information within an image plane according to the image signal acquired by the image signal acquisition unit;
a second brightness acquisition unit that acquires second brightness information including average brightness information on a projection surface projected by the projection unit;
Projection condition setting means for changing and setting projection conditions in the projection unit based on the first brightness information and the second brightness information;
A program that makes it work.

10...projector device,
21...input processing section,
22... Projection image drive unit,
23...Micromirror element,
24...Light source part,
25...mirror,
26...projection lens section,
27...Lens motor (M),
28...Photographing lens section,
29...CMOS image sensor,
30...A/D converter,
31... Photographed image processing section,
32...Lens motor (M),
33...CPU,
34...Main memory,
35...program memory,
36...operation unit,
37...Audio processing section,
38...Speaker section,
IM…Photography Department,
PJ...projection department,
SB…System bus

Claims (11)

an image signal acquisition means for acquiring an image signal;
a projection control means for controlling a projection unit that projects an image to project an image according to an image signal acquired by the image signal acquisition means;
a first brightness acquisition means for acquiring first brightness information including average brightness information within an image plane according to the image signal acquired by the image signal acquisition means;
an imaging means for imaging a projection surface including a normal image projected by the projection unit at each preset acquisition timing;
A second method for obtaining second brightness information including average brightness information from an image of the projection surface corresponding to the first brightness information projected by the projection unit and an image taken by the imaging means. a brightness acquisition means;
a memory in which a contrast value is stored before acquiring the second brightness information;
Based on the first brightness information and the second brightness information, a second brightness information corresponding to the first brightness information at the lowest brightness gradation obtained from the first brightness information is determined. A first average value of illuminance obtained from the brightness information of and a second brightness corresponding to the first brightness information at the highest brightness gradation obtained from the first brightness information. A second average value of the illuminance obtained from the information is estimated, an estimated contrast value is calculated based on the first average value and the second average value , and the estimated contrast value and the second average value are calculated. projection condition setting means for changing and setting projection conditions in the projection unit according to a comparison result with a contrast value stored in a memory before acquiring the second brightness information;
A projection control device comprising: The second brightness acquisition means extracts a projection range from the image of the projection surface taken by the imaging means, and then acquires second brightness information including average brightness information within the corresponding range. The projection control device according to claim 1. 2. The first brightness acquisition means acquires first brightness information including average brightness information of all pixels constituting one frame of the image signal acquired by the image signal acquisition means. Or the projection control device according to 2. The image signal acquisition means acquires an image signal including average brightness information,
The first brightness acquisition means acquires first brightness information including average brightness information included in the image signal acquired by the image signal acquisition means.
The projection control device according to claim 1. The projection condition setting means includes first brightness information including average brightness information acquired by the first brightness acquisition means and second brightness information including average brightness information acquired by the second brightness acquisition means. 5. The projection according to claim 1, wherein effective plot data for estimating the first average value and the second average value is set based on the contents of a plurality of sets of second brightness information. Control device. The projection condition setting means includes first brightness information including average brightness information acquired by the first brightness acquisition means and second brightness information including average brightness information acquired by the second brightness acquisition means. 6. The projection control device according to claim 5, wherein the validity of information forming two sets of brightness information is determined, and the plot data is set based on the plurality of sets of information determined to be valid. 7. The projection control device according to claim 1, wherein the preset acquisition timing is a timing at which a count number of image frames becomes a multiple of a frame rate of an image signal acquired by the image signal acquisition means. . 8. The projection condition setting means determines whether the estimated contrast value is within a permissible range, and if it is outside the permissible range, changes the brightness of the image projected by the projection unit. Projection control device. A projection device comprising the projection control device according to any one of claims 1 to 8 and the projection section. an image signal acquisition step of acquiring an image signal;
a projection control step of controlling a projection unit that projects an image to project an image according to the image signal acquired in the image signal acquisition step;
a first brightness acquisition step of acquiring first brightness information including average brightness information within the image plane according to the image signal acquired in the image signal acquisition step;
an imaging step of imaging a projection surface including a normal image projected by the projection unit at each preset acquisition timing;
A second method for acquiring an image of the projection surface corresponding to the first brightness information projected by the projection unit, and second brightness information including average brightness information from the image taken in the imaging step. brightness acquisition process,
Based on the first brightness information and the second brightness information, a second brightness information corresponding to the first brightness information at the lowest brightness gradation obtained from the first brightness information is determined. A first average value of illuminance obtained from the brightness information of and a second brightness corresponding to the first brightness information at the highest brightness gradation obtained from the first brightness information. A second average value of the illuminance obtained from the information is estimated, an estimated contrast value is calculated based on the first average value and the second average value , and the estimated contrast value and the second average value are stored in memory. a projection condition setting step of changing and setting projection conditions in the projection section according to a comparison result with a stored contrast value;
A projection control method having. A built-in device includes an image signal acquisition section that acquires an image signal, and a projection control section that controls the projection section that projects an image to project an image according to the image signal acquired by the image signal acquisition section. A program executed by a computer, which causes the computer to:
a first brightness acquisition unit that acquires first brightness information including average brightness information within an image plane according to the image signal acquired by the image signal acquisition unit;
an imaging means for imaging a projection surface including a normal image projected by the projection unit at each preset acquisition timing;
A second method for obtaining second brightness information including average brightness information from an image of the projection surface corresponding to the first brightness information projected by the projection unit and an image taken by the imaging means. a brightness acquisition means;
Based on the first brightness information and the second brightness information, a second brightness information corresponding to the first brightness information at the lowest brightness gradation obtained from the first brightness information is determined. A first average value of illuminance obtained from the brightness information of and a second brightness corresponding to the first brightness information at the highest brightness gradation obtained from the first brightness information. A second average value of the illuminance obtained from the information is estimated, an estimated contrast value is calculated based on the first average value and the second average value , and the estimated contrast value and the second average value are stored in memory. projection condition setting means for changing and setting projection conditions in the projection unit according to a comparison result with a stored contrast value;
A program that makes it work.