JP3397399B2 - Imaging device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup apparatus, and more particularly to a high resolution image information easily obtained by using a plurality of image pickup elements having a limited number of pixels without increasing the number of pixels of the image pickup element. The present invention relates to an image pickup apparatus suitable for, for example, a small video camera or a still video camera.

[0002]

2. Description of the Related Art In recent years, solid-state area sensors (image sensors in which pixels are two-dimensionally arrayed) used as image pickup devices in image pickup devices have become capable of increasing the number of pixels, lowering their prices, and further reducing their size. Therefore, it has been widely applied to home-use compact video cameras, still video cameras, and the like, and sufficient image quality has been obtained in televisions of current standards such as NTSC.

FIG. 14 is a schematic view of a main part in the vicinity of an image pickup element of a conventional single plate type image pickup apparatus.

In the figure, 101 is a taking lens and 102
Is an optical filter, and is composed of, for example, a low-pass filter or a near-infrared light cut filter. Reference numeral 103 denotes a solid-state image sensor, which is composed of, for example, an area sensor, and a color filter having a filter array as shown in FIGS. 15 and 16 is provided on the surface of the image sensor 103, for example. In the figure, an output signal (image information) obtained by the image sensor 103 is processed by a signal processing circuit (not shown), and thereby a colorized video signal is obtained and color reproduction is performed.

In order to obtain a high-resolution output signal (image information) as compared with a single-plate type image pickup device, a two-plate type or three-plate type image pickup device as shown in FIGS. 17 and 18 is required. .

In FIGS. 17 and 18, 101 is a taking lens, and 102 is an optical filter, which is composed of, for example, a low-pass filter or a near-infrared light cut filter. Reference numeral 104 denotes a dichroic prism (or a half mirror) as a color separation means, which separates the incident light into two color lights in FIG. 17, and also separates the incident light into three color lights in FIG. There is. 103A, 10
Reference numerals 3B and 103C are solid-state image pickup devices, each of which is composed of, for example, an area sensor and is provided on the exit surface of each prism.

In these image pickup devices, an output signal (image information) obtained from each solid-state image pickup element 103A, 103B, 103C is processed by a signal processing circuit (not shown) to obtain a colorized video signal. Color reproduction is performed.

[0008]

However, although the number of pixels of the image pickup device has been increasing in recent years in the conventional single-plate type image pickup device, its resolution is limited by the number of pixels of the solid-state image pickup device. It is difficult to reduce the cost because it is not possible to obtain an image with a resolution of 2) and the image pickup device with a high number of pixels is very expensive.

On the other hand, in a two-plate type or three-plate type image pickup device, since a dichroic prism, a half mirror or the like is used as color separation means, the back focus of the photographing lens becomes extremely long, and the size of the entire device cannot be reduced. There was a problem. Further, these optical members are expensive, and thus it is difficult to reduce the cost.

According to the present invention, a plurality of image pickup devices having a limited number of pixels are used to appropriately set the arrangement of the image pickup devices and the respective optical elements constituting the image pickup system when a subject image is formed on each image pickup device. At the same time, an object of the present invention is to provide an image pickup apparatus in which a filter having a predetermined spectral characteristic is provided on each image pickup element surface so that high-definition image information (color image) can be easily obtained.

[0011]

According to a first aspect of the present invention, there is provided an image pickup apparatus, wherein a first optical system forms a subject image on a predetermined image formation plane, and the image is formed on the optical axis of the first optical system. The second optical system arranged near the planned image forming surface and the third optical system arranged on the optical axis of the first optical system and behind the second optical system form the planned image formation. All of the subject images formed on the surface are re-imaged on the first image pickup means, have an optical axis outside the optical axis of the first optical system, and are arranged behind the second optical system. Part of the subject image formed on the planned image forming surface by the optical system of FIG. 2 is re-imaged on the second image pickup means, and the image information obtained by the first image pickup means and the second image pickup means is used. An image pickup apparatus for obtaining high-definition image information by providing a filter having a predetermined spectral characteristic on the surface of the first image pickup means, and setting the predetermined image on the surface of the second image pickup means. It is characterized in that a filter having a spectral characteristic different from a spectral characteristic of light characteristics.

According to a second aspect of the present invention, in the first aspect, the fourth optical system has a plurality of lens systems.
The second image pickup means has a plurality of image pickup elements corresponding to the plurality of lens systems. According to a third aspect of the present invention, in the second aspect, the plurality of lens systems of the fourth optical system divides the subject image formed by the first optical system into a plurality of regions, and the subject images of the respective regions are divided. Is imaged on the surface of the corresponding image pickup device. According to a fourth aspect of the invention, in the second or third aspect of the invention, the third optical system and the plurality of lens systems of the fourth optical system have different imaging magnifications. According to a fifth aspect of the invention, in the second, third or fourth aspect of the invention, a plurality of signals forming the second image pickup means by forming a low frequency image signal using the output signal from the first image pickup means. The image signal in the high frequency range is formed by using the output signal from the image pickup device. The invention of claim 6 is the same as the invention of claim 2, 3, 4 or 5,
The color signal is formed by using the output signal from the image pickup means, and the luminance signal is formed by using the output signals from the plurality of image pickup elements forming the second image pickup means. The invention of claim 7 is characterized in that, in the invention of claim 1, the filter provided on the surface of the first image pickup means is provided with a filter having a plurality of regions having different spectral characteristics. The invention of claim 8 is characterized in that, in the invention of claim 1 or 2, a filter having a spectral characteristic of luminance color light characteristics is provided on a plurality of image pickup device surfaces constituting the second image pickup means. The invention of claim 9 is characterized in that, in the invention of claim 1 or 2, a filter having a spectral characteristic of a green light characteristic is provided on a plurality of image pickup device surfaces constituting the second image pickup means. A tenth aspect of the present invention is characterized in that, in the first or second aspect of the invention, the plurality of image pickup elements forming the second image pickup means are at least line sensors.

An image pickup apparatus according to the invention of claim 11 forms an image of a subject on a planned image forming surface by the first optical system, and has the same optical axis as the first optical system arranged near the planned image forming surface. Object image formed on the planned image formation plane by the second optical system and the third optical system that is arranged behind the second optical system and has the optical axes of the first optical system and the first optical system aligned with each other. Are imaged on the surface of the first image pickup means, and a plurality of areas obtained by dividing the subject image formed on the planned image formation surface have an optical axis different from the optical axis of the first optical system. On the plurality of image pickup element surfaces of the second image pickup means having a plurality of image pickup elements corresponding to the respective optical systems by the fourth optical system having a plurality of lens systems and arranged behind the second optical system. To form image information on all subject images by combining image information from the plurality of image pickup devices And an imaging device, provided with a filter having a predetermined spectral characteristic in the first image pickup means surface,
It is characterized in that a filter having a spectral characteristic different from the predetermined spectral characteristic is provided on a plurality of image pickup device surfaces constituting the second image pickup means.

According to a twelfth aspect of the invention, in the eleventh aspect of the invention, the third optical system and the plurality of lens systems of the fourth optical system have different imaging magnifications. According to a thirteenth aspect of the present invention, in the eleventh or twelfth aspect of the invention, a plurality of image pickups forming the second image pickup section by forming a low-frequency video signal using the output signal from the first image pickup section. It is characterized in that a high frequency image signal is formed by using an output signal from the element. Claim 14
In the invention of claim 11 or 12, the invention of
The color signal is formed by using the output signal from the image pickup means, and the luminance signal is formed by using the output signals from the plurality of image pickup elements forming the second image pickup means. According to a fifteenth aspect of the invention, in the eleventh aspect of the invention, the filter provided on the surface of the first imaging means has a plurality of regions having different spectral characteristics. A sixteenth aspect of the present invention is characterized in that, in the eleventh or twelfth aspect of the invention, a filter having a spectral characteristic of luminance color light characteristics is provided on a plurality of image pickup device surfaces forming the second image pickup means. The invention of claim 17 is claim 11 or 1.
In the second aspect of the invention, a filter having a spectral characteristic of green light characteristics is provided on the surfaces of the plurality of image pickup devices forming the second image pickup means. According to a eighteenth aspect of the present invention, in the eleventh or twelfth aspect of the present invention, the plurality of image pickup devices forming the second image pickup means are composed of at least a line sensor, and the subject image is divided by scanning the line sensor. The feature is that image information of the area is obtained.

[0015]

FIG. 1 is a sectional view of the essential parts of an optical system according to the first embodiment of the present invention, and FIG. 2 is a perspective view of the essential parts of the first embodiment of the present invention.

In the figure, reference numeral 1 denotes a first optical system, which forms a subject image on a primary image forming surface (planned image forming surface) 21.

Reference numeral 2 is a second optical system, and the first optical system 1
Of the subject image formed on the primary image forming surface 21 and is guided to the subsequent lens system. There is.

Reference numeral 3 denotes a third optical system, and the first optical system 1
It is arranged on the optical axis of, and behind the second optical system 2 (on the image plane side). That is, the optical axis of the third optical system 3, the optical axis of the first optical system 1, and the optical axis of the second optical system 2 coincide with each other.

Reference numeral 31 denotes a first image pickup means (main image pickup means), which is arranged on the image forming plane behind the third optical system 3 and is composed of, for example, a solid area sensor. In the present embodiment, as shown in FIG. 3B, a red (R) color filter and a blue (B) color filter having spectral characteristics that do not require visually high resolution are mainly provided on the surface of the first image pickup means 31. The color filters are arranged alternately in the scanning direction (horizontal direction in the drawing) and in the sub-scanning direction (vertical direction in the drawing).

The entire area of the subject image formed on the primary imaging surface 21 by the first optical system 1 is recombined on the surface of the first image pickup means 31 by the second optical system 2 and the third optical system 3. I'm making you image.

Reference numeral 4 denotes a fourth optical system, which has four lens systems, a 41st lens system 4A, a 42nd lens system 4B, a 43rd lens system 4C, and a 44th lens system 4D.

The four lens systems 4A, 4B, 4C and 4D have an optical axis outside the optical axis of the first optical system 1 and the second optical system 2
It is located behind.

Reference numeral 41 denotes a second image pickup means (sub-image pickup means), which is, for example, four image pickup elements 4 each including a solid-state area sensor.
1A, 41B, 41C, 41D, which are arranged on the image planes of the four lens systems 4A, 4B, 4C, 4D, respectively.
In this embodiment, four image pickup devices 41A, 41B, 41C,
As shown in FIG. 3A, a green (G) color filter having a spectral characteristic requiring visually high resolution is provided on the surface 41D.

The four lens systems of the fourth optical system 4 (4A,
4B, 4C, 4D) divides the subject image on the primary image forming surface 21 formed by the first optical system 1 into a plurality of regions, and the subject images in the respective regions are respectively associated with image pickup devices 41A, 41B, 41.
The image is re-formed on the C and 41D planes.

In the second embodiment, in the second optical system 2, the pupil 1a of the first optical system 1 and the pupil 3a of the third optical system 3 are substantially conjugate with each other, as indicated by the optical path 32 of the solid line in the figure. I am trying. Further, as shown by an optical path 42 indicated by a broken line in the drawing, a plurality of lens systems 4A, 4B, 4C, 4D which constitute the fourth optical system 4 are formed.
Pupils 4A1, 4B1, 4C1, 4D1 of the first optical system 1
An image is formed near each of the divided pupil regions.

Four lens systems (4A, 4B, 4C, 4D) of the third optical system 3 and the fourth optical system 4 in this embodiment.
The image forming magnifications of and are different from each other, which effectively aligns the pupil image formation.

In this embodiment, as shown in FIG.
The subject image is formed on the primary image forming surface 21 by the optical system 1, and the subject image is formed on the surface of the first image pickup means 31 by the third optical system 3 through the second optical system 2. The entire area of is imaged. Further, the four lens systems 4A, 4B, 4C, and 4D of the fourth optical system 4 divide the subject image formed on the primary imaging surface 21 into four regions, and divide the subject image in each region into the second region. The four image pickup devices 41A, 41B, 41C and 41D constituting the image pickup means 41 are imaged respectively.

The output signal (image information) from the first image pickup means 31 and the output signals (image information) from the four image pickup elements 41A, 41B, 41C and 41D constituting the second image pickup means 41 are used. A color image signal is obtained by a signal processing system (not shown) which will be described later and color reproduction is performed.

In this embodiment, the optical axes of the third optical system 3 and the fourth optical system 4 are arranged so that they do not coincide with each other, and the object images formed on the primary image plane 21 are overlapped as desired. The image is re-imaged on the surface of the corresponding image pickup device at a magnification and a magnification.

Further, in the present embodiment, the sum of the plurality of divided images formed by the fourth optical system 4 is configured to include the entire area of the subject image formed by the first optical system 1. That is, the adjacent divided images are configured to overlap each other with pixels at the boundary portion so that no inconvenience occurs at the image boundary portion.

Next, the image processing method of this embodiment will be described with reference to FIG. This figure is a block diagram of the essential parts of the video signal processing unit (signal processing system) of the image pickup apparatus of this embodiment.

In the figure, 41A, 41B, 41C, 4
1D and 31 are image pickup devices, and these image pickup devices 4
1A, 41B, 41C, 41D, 31 on the surface of FIG.
The color filters shown in are provided respectively.

In this embodiment, a subject image formed by dividing the area into four image pickup devices 41A, 41B, 41C and 41D of the second image pickup means 41 is formed into image pickup devices 41A, 41B and 4.
1C, 41D output as an electric signal (G signal), and each sample hold circuit (S / H circuit) 51A, 51B,
Sample hold with 51C and 51D, each analog-
Digital conversion circuits (A / D conversion circuits) 53A, 53B,
The analog signals are converted into digital signals by 53C and 53D, and the memories (memory circuits) 55A, 55B, 55C and 5 are converted.
Stored in 5D.

Further, the entire image of the subject formed on the first image pickup means 31 is outputted from the image pickup device 31 as an electric signal (R signal and B signal are alternately outputted), and each sample hold circuit (S / S) is outputted. H circuit) 52A, 52B sample-hold, each analog-digital conversion circuit (A / D conversion circuit) 54A, 54B converts an analog signal into a digital signal, and stores it in each memory (memory circuit) 56A, 56B. ing.

The memories 55A, 55B, 55C,
Each memory 55A, 55B, 55C, 55D is arranged in such an order that the entire screen can compose the G signal stored by dividing the area into 55D.
The information is read out from and is input to the luminance signal processing circuit 57 and the color signal processing circuit 58, respectively. The R signal and B signal stored in the memories 56A and 56B are input to the color signal processing circuit 58.

The luminance signal processing circuit 57 performs necessary signal processing on the G signal as a luminance signal, for example, automatic gain control (AGC) and gamma correction, and outputs it as a luminance signal. The color signal processing circuit 58 performs processing such as AGC, gamma correction, and white balance adjustment on the input R, G, and B signals, performs matrix processing, and outputs color difference signals. Then, a color video signal is obtained using these signals to perform color reproduction.

Each output signal of the luminance signal and the color difference signal may be converted from a digital signal to an analog signal by a digital-analog conversion circuit (D / A conversion circuit) as necessary, or may be output. It may be converted into a composite video signal by the encoder circuit and output.

In this embodiment, the image pickup devices 41A, 41B,
The number of pixels of 41C, 41D, and 31 are all the same, and the first image pickup means 31 is formed by the signal processing system as described above.
To form a low-frequency video signal from the second image pickup means 41.
Of the plurality of image pickup elements 41A, 41B, 41C, 4 constituting the
A high-frequency video signal is formed from 1D. In particular, the luminance signal is formed by using the output signals from the plurality of image pickup elements 41A, 41B, 41C, 41D that constitute the second image pickup means 41, and therefore, higher resolution can be achieved as compared with the conventional image pickup apparatus. it can.

In the present embodiment, the image pickup devices 31, 4 are
The arrangement of the color filters provided on the 1A, 41B, 41C and 41D surfaces is not limited to the filter arrangement shown in FIG.
For example, as long as a luminance signal component and a chrominance signal component are obtained as shown in FIGS. 5, 6, 7 and 8, the present invention is applied in the same manner as in the above-described first embodiment, regardless of the filter arrangement. be able to.

That is, in FIG. 5, the second image pickup means 41 is used.
A green (G) color filter is provided on the (41A to 41D) surface, and red (R) color and blue (B) color filters are alternately arranged in the main scanning direction on the surface of the first imaging unit 31. A color filter is provided. In FIG. 6, a yellow (Y) color filter is provided on the surface of the second image pickup means 41 (41A to 41D), and red (R) and blue (B) colors are provided on the surface of the first image pickup means 31. A color filter is provided in which the filters are arranged alternately in the main scanning direction and the sub scanning direction. In FIG. 7, a yellow (Y) color filter is provided on the surface of the second image pickup means 41 (41A to 41D), and red (R) and blue (B) colors are provided on the surface of the first image pickup means 31. A color filter is provided in which the filters are arranged alternately in the main scanning direction. Further, in FIG. 8, the second image pickup means 41 (41A to 41D)
A white (W) color filter is provided on the surface, and red (R), green (G), and blue (B) filters are alternately arranged in the main scanning direction on the surface of the first imaging unit 31. It has a color filter.

In particular, with the filter arrangement shown in FIG. 8, for example, when a high-resolution image is not required, the image can be picked up by using only the signal of the first image pickup means 31.

Further, in the present embodiment, the second image pickup means 4
A part of the subject image can be selectively used by selecting and using only a part of the four image pickup devices 41A, 41B, 41C, and 41D.

Further, in the present embodiment, the fourth optical system 4 is composed of four lens systems 4A, 4B, 4C and 4D, but the number is not limited to four and, for example, a subject image can be formed. Any number may be used as long as the whole area is divided by a plurality of lens systems and can be photographed. Especially the fourth optical system 4
Is composed of five or more lens systems, it is possible to obtain a higher resolution color image.

Further, a plurality of image pickup elements 41A, 41B, 41 constituting the first image pickup means 31 and the second image pickup means 41.
The number of pixels of C and 41D does not have to be the same, and particularly when the number of pixels of the plurality of image pickup elements 41A, 41B, 41C and 41D is larger than the number of pixels of the first image pickup means 31, the fourth optical system. 4 may be composed of one lens system.

In this embodiment, as described above, each element of the image pickup device is appropriately set, and the first image pickup means 31 arranged on the image forming plane of the third optical system 3 sets the low frequency of the object image. A plurality of image pickup devices 41A, 4A constituting the second image pickup means 41 arranged on the image plane of the fourth optical system 4 for picking up the image of the region component.
1B, 41C, and 41D capture high-frequency components of a subject image, so that unlike conventional image pickup devices, multiple plates and color can be obtained without using expensive optical members such as dichroic prisms and half mirrors as color separation means. Can be performed, and thereby, the back focus of the taking lens is not restricted.

FIG. 9 shows a plurality of image pickup devices 4 constituting the first image pickup means 31 and the second image pickup means 41 of the second embodiment of the present invention.
It is explanatory drawing which showed the mode of arrangement of the color filter provided on 1A, 41B, 41C, 41D surface.

The present embodiment differs from the above-mentioned first embodiment in that a plurality of image pickup elements 41 constituting the second image pickup means 41.
A, 41B, 41C and 41D are composed of line sensors (CCD) instead of area sensors, and the plurality of line sensors 41A, 41B, 41C and 41D are respectively scanned in the sub-scanning direction to cover the entire area of the subject image. That is, it was taken. Other configurations and optical functions are substantially the same as those in the first embodiment.

That is, in the present embodiment, the four image pickup devices 41A, 41B, 41 constituting the second image pickup means 41 are used.
C and 41D are composed of line sensors, and the line sensors 41A, 41B, 41C, and 41D are shown in FIG.
As shown in (A), a green (G) color filter is provided. And the four lens systems 4A, 4 of the fourth optical system 4
The subject image formed on the primary imaging surface 21 by B, 4C, and 4D is divided into four regions, and the divided subject images in each region are divided into line sensors 41A, 41B, 41C, and 41D.
Each image is formed on the surface. And each line sensor 4
By scanning 1A, 41B, 41C and 41D respectively in the sub-scanning direction, the entire area of the subject image is divided into areas by the respective line sensors 41A, 41B, 41C and 41D and the images are picked up.

Then, as in the above-described first embodiment, signals (image information) from the four image pickup devices 41A, 41B, 41C and 41D constituting the first image pickup means 31 and the second image pickup means 41 are used. The video signal processing unit (signal processing system) shown in FIG. 4 is used to obtain a luminance signal and a color difference signal for color reproduction.

In the present embodiment, the number of pixels of the line sensor is set to be several times larger than the number of pixels of the normal area sensor in the main scanning direction, whereby the resolution is higher than that of the conventional image pickup apparatus. .

The arrangement of the color filters provided on the surface of each image pickup device in this embodiment is not limited to the filter arrangement shown in FIG. 9, and, for example, as shown in FIG. 10, FIG. 11, FIG. 12 and FIG. Any filter arrangement can be applied as long as the signal component and the color signal component are obtained. Each filter arrangement shown in FIGS. 10 to 13 is similar to the filter arrangement shown in FIGS.

In particular, if the filter array shown in FIG. 13 is used as in the case of the first embodiment, for example, when a high resolution image is not required, only the first image pickup means 31 is used for image pickup. By doing so, it is not necessary to scan each line sensor 41A, 41B, 41C, 41D in the sub-scanning direction, so that a moving image can be taken and the shooting time can be shortened.

In the present embodiment, the fourth optical system 4 is composed of four lens systems 4A, 4B, 4C and 4D, but the number is not limited to four and one Alternatively, any number may be used as long as the whole area of the subject image can be divided into a plurality of lens systems and photographed.

[0054]

According to the present invention, each element of the image pickup apparatus is appropriately configured as described above, the first image pickup means picks up a low frequency component of the object image, and the second image pickup means changes the image of the object image. By capturing a high-frequency component, a high-resolution image (color image) can be obtained using an imaging device with a limited number of pixels without using expensive optical members such as a dichroic prism and a half mirror. Moreover, the back focus of the photographing optical system is not restricted.

Further, by selecting and using only a part of the plurality of image pickup devices of the second image pickup means, an image pickup device which can selectively use a part of the subject image is achieved. be able to.

[Brief description of drawings]

FIG. 1 is a schematic view of a main part of an optical system according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an array of color filters provided on the surfaces of the first and second image pickup devices according to the first embodiment of the present invention.

FIG. 4 is a block diagram of a main part of a signal processing system according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an arrangement of color filters provided on the surfaces of the first and second image pickup devices according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an array of color filters provided on the surfaces of the first and second image pickup devices according to the first embodiment of the present invention.

FIG. 7 is an explanatory diagram showing an array of color filters provided on the surfaces of the first and second image pickup devices according to the first embodiment of the present invention.

FIG. 8 is an explanatory diagram showing an array of color filters provided on the surfaces of the first and second image pickup devices according to the first embodiment of the present invention.

FIG. 9 is an explanatory diagram showing an array of color filters provided on the surfaces of the first and second image pickup devices according to the second embodiment of the present invention.

FIG. 10 is an explanatory diagram showing an array of color filters provided on each of the first and second image pickup device surfaces of the second embodiment of the present invention.

FIG. 11 is an explanatory diagram showing an array of color filters provided on the surfaces of the first and second image pickup devices according to the second embodiment of the present invention.

FIG. 12 is an explanatory diagram showing an array of color filters provided on the surfaces of the first and second image pickup devices according to the second embodiment of the present invention.

FIG. 13 is an explanatory diagram showing an array of color filters provided on the surfaces of the first and second image pickup devices according to the second embodiment of the present invention.

FIG. 14 is a schematic view of a main part of a conventional imaging device.

FIG. 15 is an explanatory diagram showing an array of color filters provided on the image pickup element surface of a conventional image pickup apparatus.

FIG. 16 is an explanatory diagram showing an array of color filters provided on an image pickup element surface of a conventional image pickup apparatus.

FIG. 17 is a schematic view of a main part of a conventional two-plate type imaging device.

FIG. 18 is a schematic view of a main part of a conventional three-plate type imaging device.

[Explanation of symbols]

1 1st optical system 2 2nd optical system 3 3rd optical system 4 4th optical system 21 1st image formation plane 31 1st image pickup means 41 2nd image pickup means 4A, 4B, 4C, 4D lens Systems 41A, 41B, 41C, 41D Image pickup devices 51A, 51B, 51C, 51D Sample-hold circuits 52A, 52B Sample-hold circuits 53A, 53B, 53C, 53D Analog-digital conversion circuits 54A, 54B Analog-digital conversion circuits 55A, 55B, 55C, 55D memory 56A, 56B memory 57 luminance signal processing circuit 58 color signal processing circuit

Claims (18)

(57) [Claims] 1. A second optical system which forms a subject image on a planned image forming plane by the first optical system, and is arranged on the optical axis of the first optical system and near the planned image forming plane. A first image pickup means for all the subject images formed on the planned image forming surface by the third optical system arranged on the optical axis of the first optical system and behind the second optical system. Image formed on the planned image forming plane by the fourth optical system which is re-imaged on the optical axis and has an optical axis outside the optical axis of the first optical system, and which is arranged behind the second optical system. Device for re-imaging a part of the image on the second image pickup means and obtaining high-definition image information by using image information obtained by the first image pickup means and the second image pickup means in a, the filter having a predetermined spectral characteristic onto an imaging device surface of the first provided, the predetermined spectral characteristic onto an imaging device surface of the second
An image pickup apparatus comprising a filter having a spectral characteristic different from the above . 2. The fourth optical system has a plurality of lens systems, and the second image pickup means has a plurality of image pickup devices corresponding to the plurality of lens systems. The image pickup apparatus according to claim 1. 3. The plurality of lens systems of the fourth optical system are provided on respective image pickup element surfaces of object images of respective areas when the object image formed by the first optical system is divided into a plurality of areas. The image pickup apparatus according to claim 2, wherein the image is formed on the image. 4. The image pickup apparatus according to claim 2, wherein the third optical system and the plurality of lens systems of the fourth optical system have different imaging magnifications. 5. A low-frequency image signal is formed using the output signal from the first image pickup means, and a high-frequency area is formed using output signals from a plurality of image pickup elements forming the second image pickup means. 3. The video signal according to claim 2 is formed .
The imaging device according to 3 or 4 . 6. A color signal is formed using an output signal from the first image pickup means, and a luminance signal is formed using output signals from a plurality of image pickup elements forming the second image pickup means. The image pickup apparatus according to claim 2, 3, 4, or 5 . 7. A fill provided on the surface of the first image pickup means.
The image pickup apparatus according to claim 1, wherein the target has a plurality of regions having different spectral characteristics . 8. The image pickup apparatus according to claim 1, wherein a filter having a spectral characteristic of a luminance color light characteristic is provided on a plurality of image pickup device surfaces forming the second image pickup means. 9. The image pickup apparatus according to claim 1, wherein a filter having a spectral characteristic of a green light characteristic is provided on a surface of a plurality of image pickup elements forming the second image pickup means. 10. The image pickup apparatus according to claim 1, wherein the plurality of image pickup elements forming the second image pickup means are at least line sensors. 11. An object image is formed on a planned image forming surface by a first optical system, and a second optical system having the same optical axis as that of the first optical system arranged near the planned image forming surface. The first image pickup means includes all of the subject image formed on the planned image forming plane by the third optical system which is arranged behind the second optical system and whose optical axis is aligned with that of the first optical system. While focusing on the surface,
A plurality of areas obtained by dividing the subject image formed on the planned image forming surface
And the first optical system of the plurality having a different optical axis optical axis lens system have a of the second optical system by the fourth optical system arranged behind the plurality corresponding to the respective optical systems The second image pickup means having an image pickup element is provided on each of the plurality of image pickup element surfaces.
S is imaged, an imaging device to obtain image information image information synthesized by for all subject image from the image pickup device of the plurality of, with a predetermined spectral characteristic in the first image pickup means plane A filter is provided, and a filter having a spectral characteristic different from the predetermined spectral characteristic is provided on the surfaces of the plurality of image pickup devices forming the second image pickup means.
An image pickup device comprising a filter . 12. The image pickup apparatus according to claim 11, wherein the third optical system and the plurality of lens systems of the fourth optical system have different imaging magnifications. 13. A low-frequency video signal is formed by using an output signal from the first image pickup means, and a high-frequency area is formed by using output signals from a plurality of image pickup devices constituting the second image pickup means. 2. The video signal according to claim 1 is formed.
The imaging device according to 1 or 12. 14. A color signal is formed using an output signal from the first image pickup means, and a luminance signal is formed using output signals from a plurality of image pickup elements forming the second image pickup means. The imaging device according to claim 11 or 12, characterized in that. 15. A filter provided on the surface of the first image pickup means.
The image pickup apparatus according to claim 11, wherein the router has a plurality of regions having different spectral characteristics . 16. The image pickup apparatus according to claim 11, wherein a filter having a spectral characteristic of a luminance color light characteristic is provided on a plurality of image pickup device surfaces constituting the second image pickup means. 17. The image pickup apparatus according to claim 11, wherein a filter having a spectral characteristic of a green light characteristic is provided on a plurality of image pickup device surfaces forming the second image pickup means. 18. plurality of imaging elements constituting the second imaging means Ri comprises at least a line sensor, said line
The image of the subject is separated by scanning the sensor.
The image information of the divided area is obtained.
The imaging device according to 1 or 12.