JPH0591520A - Solid-state color image pickup device - Google Patents

Abstract

PURPOSE:To correct registration deviation between images due to the the magnification chrominance abberation of a lens in a solid-state color image pickup device and the fixing (rotation) deviation of a solid-state image pickup element. CONSTITUTION:The solid-state color image pickup device is constituted of a lens 1, a color decomposing optical system 2 for decomposing incident light, three CCDs 3 to 5 fixed to the optical system 2, A/D converters 6 to 8 for converting signals read out from respective corresponding CCDs 3 to 5, memories 9 to 11 for storing converted signals, a memory control part 15 for reading out the stored signals while correcting the addresses of the signals, and D/A converters 12 to 14 for converting the signals read out from the memories 9 to 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-state color image pickup device, and more particularly to registration correction.

[0002]

2. Description of the Related Art A registration shift occurring in an image pickup apparatus having a plurality of image pickup elements will be described. If the lens of the image pickup device has a chromatic aberration of magnification, a phenomenon occurs in which the magnification of image formation varies depending on the wavelength of light. Therefore, in a multi-tube type or multi-plate type color camera that splits light into wavelengths with a color separation optical system and forms an image on a plurality of image pickup devices, the registration shift due to the image size being different for each image pickup device. Occurs.

For example, FIG. 7 is a diagram showing lateral chromatic aberration in a lens. Reference numeral 1 denotes a lens, and 26 denotes an image plane. The light incident on the lens 1 forms an image on the image forming surface 26, but the size of the subject image varies depending on the wavelength due to the chromatic aberration of magnification of the lens 1.

Conventionally, in a color camera using an image pickup tube, when the signal charge on the image pickup surface is read out, the scanning interval and scanning size of the electron beam are adjusted to output the image as an apparently enlarged or reduced signal. can do. Therefore, in the multi-tube color camera, each image pickup tube enlarges or reduces the image by electron beam scanning according to the chromatic aberration of magnification of the lens, and the image sizes of all the image pickup tubes are made to match. On the other hand, in the solid-state image pickup device, an image is formed by regularly reading out signals from pixels arranged regularly on the light receiving surface, so that the registration deviation cannot be corrected by the same means as the above-mentioned image pickup tube. Therefore, it is difficult to correct the registration deviation in the multi-plate color camera.

[0005]

As described above, when it is attempted to correct the registration deviation in the conventional example, in the multi-tube color camera, the registration deviation is corrected by the method of the conventional example described above. However, in the multi-plate color camera, the registration shift due to the chromatic aberration of magnification of the lens and the C
There is a problem in that the correction cannot be made at all when the CD is attached and the disc is displaced in the rotation direction.

The present invention has been made in order to solve the above-mentioned problems, and is caused by misregistration due to chromatic aberration of magnification of a lens and misregistration caused by rotational displacement of a plurality of solid-state image pickup devices. It is an object of the present invention to obtain a solid-state color imaging device that can also correct

[0007]

A solid-state color image pickup device according to the present invention comprises a color separation optical system for separating a subject image into three primary color lights, and a plurality of solid-state image pickup devices for converting each of the separated three primary color lights into an electric signal. An element, a plurality of A / D converters for converting each of the electric signals into digital signals, a plurality of memories for storing the converted digital signals, a registration shift of addresses of the plurality of memories, and a CCD A memory control unit for performing control for reading while correcting according to the information on the deviation in the rotation direction, and a plurality of D / A converters for converting signals read from the plurality of memories into analog signals are provided. It is a thing.

[0008]

The memory control unit provided in the solid-state color image pickup device according to the present invention measures the information from the lens in advance and R
Correction data is generated from the rotation deviation information of each solid-state image sensor written in the OM, and the image signal stored in each memory is read according to the correction data to correct the registration deviation between the images. To do.

[0009]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a lens, 2 is a color separation optical system that separates the incident light from the lens 1 into three color lights of R, G, B, and 3, 4, 5 are the color separation optical systems 2 respectively.
The solid-state image sensor (hereinafter referred to as CCD) that converts the light separated in color into an electric signal, 6, 7, and 8 are the CCD 3,
A / D converters for converting the analog signals read from each of 4, 5 into digital signals, and 9, 10, 11 for converting the digital signals converted by the A / D converters 6, 7, 8 into image signals. A memory controller 15, 12 and 13 for reading out the addresses of the memories 9, 10 and 11 while performing correction according to information such as registration deviation due to lateral chromatic aberration of the lens 1 and rotation deviation information. , 14 are D / A converters for converting the read signals back into analog signals.

Next, the configuration of the memory controller 15 will be described with reference to FIG. Reference numeral 16 is a correction data generation that calculates registration deviation (deviation of the R and B image positions with respect to the G image position) in real time from information (focus position, zoom ratio, aperture value, etc.) from the lens 1 and generates correction data. Reference numeral 18 is a circuit, ROM is a ROM in which the information about the rotational deviation when the CCDs 3, 4, and 5 are attached to the color separation optical system 2 is measured and written in advance, and 17 is a control signal and an address control signal according to the information from the ROM 18. A microprocessor 19 for generating a write address counter for counting and designating an address necessary for writing the digital signals from the A / D converters 6, 7, 8 into the memories 9, 10, 11, 20, 21, 22 is each memory 9, 1
Addresses for reading data from 0 and 11 are stored in the ROM 1 and the address control signal from the microprocessor 17.
Control signal and correction data generation circuit 1 according to information from 8
6 is a read address control circuit which is controlled and designated by the correction data from 6.

Next, the operation will be described. The light that has passed through the lens 1 is separated into R, G, and B colors by the color separation optical system 2 and converted into electric signals by the CCDs 3, 4, and 5, respectively. The electric signals read from the CCDs 3, 4 and 5 are converted into digital signals by the A / D converters 6, 7 and 8. The signal is sequentially stored in the addresses designated by the write address counter 19 of the memories 9, 10, 11. The stored image signal is read out by the read address control circuits 20, 21, 22 of the memory control unit 15 while correcting the rotation deviation and the registration deviation. This read signal is the D / A converter 1
Converted to analog signals at 2, 13, and 14.

Next, the CCD will be described with reference to FIGS. 3 and 4.
An example of the rotation deviation when the color separation optical systems 2, 3 and 4 are attached and the deviation on the screen at that time will be described. FIG. 3 shows an example in which the CCDs 3, 4, and 5 are displaced in the rotational direction when attached to the color separation optical system 2. FIG. 4 shows an example (actually a smaller deviation) of an image of a triangular object in a state where there is a rotation deviation as in FIG. 3 and a registration deviation due to the lateral chromatic aberration of the lens 1 occurs. 23,
Reference numerals 24 and 25 are B, G, and R images captured by the CCDs 3, 4, and 5, respectively, which are very unsightly images when superposed.

FIG. 5 shows each of the memories 9, 10, 1 in a state where the CCDs 3, 5 are displaced in the rotational direction and the registration displacement is caused by the chromatic aberration of magnification of the lens 1.
FIG. 1 is a diagram in which an image signal is stored in FIG. In order to explain the operation of the embodiment of the present invention, three samples from the image signals of the memories 9, 10 and 11 are sampled and represented by black circles, cross marks and black squares. .. These three sampled image signals are based on the image positions of the three sampled image signals (black circles) of FIG. 5B, respectively, and are referred to as (a) (cross mark) in FIG. 5 and (c) (black) in FIG. It is a sample of the image signal at the same position (although the magnification is different). Further, an image signal obtained by sampling the portions of the triangular subject showing respective vertices is set as G =, B =, R =, and an image signal obtained by sampling the portion showing the left side of the triangular subject is
G =, B =, R =, and an image signal obtained by sampling a portion showing the right side of the triangular object is G =, B =
, R =. In the present invention, as a means for correcting the deviation as shown in FIG. 5, the size of the R image and the size of the B image are changed by the information indicating the amount of the rotational deviation of the ROM 18 and the correction data for the registration deviation to change the size of the G image. Consider controlling the address to match.

Therefore, the memory control unit 15 controls the read address. The operation will be described with reference to FIG. FIG. 6 (a) is the same as FIG. 5 (a), (b), (c).
Three image signals sampled in (total 9)
Is stored in each address of the memory (memory 9, 10, 11 are shown in an overlapping manner). For example, the image signal sampled from the G image is
In FIG. 6A, it is stored at the address G (10, 3). Note that the addresses of the memory in FIG. 6 are assumed to be 18 in the horizontal direction and 10 in the vertical direction, and in the drawing, + or + in the right or upper direction and − in the left or lower direction.

First, the address G (10,
When the image signal of 3) is read, the address read from the memory 9 at the same timing is set by the correction data generation unit 16 in the memory control unit 15 as the information (focus position, zoom ratio, diaphragm position) of the lens 1 at the time of the current image pickup. ), The registration deviation is calculated (the deviation amount with respect to the G image position), and the correction data of the B image obtained by the correction data generating unit 16 and the rotation deviation information of the CCD 3 of the ROM 18 obtained from the microprocessor 17 The image signal of the address B (11, 5) is read out by being designated by the read address control circuit 22 (position +1 in the horizontal direction and -2 in the vertical direction in FIG. 6). Then, from the memory 11, the correction data generation unit 16 in the memory control unit 15 calculates the registration shift based on the information (focus position, zoom ratio, diaphragm position) of the lens 1 at the time of the current image pickup (the shift amount with respect to the G image position). The correction data of the R image obtained by the correction data generation unit 16 and the microprocessor 17
The address is designated by the read address control circuit 20 based on the information on the rotation deviation of the CCD 5 of the ROM 18 obtained from the above (at the position of -3 in the horizontal direction and +1 in the vertical direction in FIG. 6).
Then, the image signal at the address R (7, 2) is read out.

Next, the sampled address G of the memory 10
When the image signal of (6, 7) is read, the correction data for the registration deviation output from the correction data generation unit 16 in the read address control circuit 22 and the ROM 18 obtained from the microprocessor 17 are read from the memory 9. An address is designated by the information of the rotational deviation of the CCD 3 (position of +2 in the horizontal direction and +1 in the vertical direction in FIG. 6), and the image signal of the address B (8,6) is read out. At the same timing, the read address control circuit 20 reads the correction data generator 16 from the memory 11.
Correction data for the registration deviation output from the ROM 1 obtained from the microprocessor 17
The address is designated by the information on the rotational displacement of the CCD 5 of 8 (in FIG. 6, the position is -2 in the horizontal direction and -3 in the vertical direction).
Then, the image signal at the address R (4, 10) is read out. Similarly to the above-mentioned means, when the image signal at the address G (14, 7) of the memory 10 is read, the image signal at the address B (12, 8) is read from the memory 9.
The image signal at the address R (15,5) is read from the memory 11. In this way, the memory controller 15
If the reading of the address is controlled in the entire screen area with, it is possible to correct the registration deviation between the images and the rotation deviation of the CCDs 3, 4 and 5 as shown in FIG. The size can be adjusted.

Embodiment 2. In the above embodiment, the CCD 3,
When the color separation optical systems 2 and 4 are attached to the CCDs 3,5
Although the correction operation has been described in the case where only the CCDs 3, 4 and 5 are displaced in the rotational direction, the same effect as the above embodiment can be obtained by changing the contents of the ROM 18 even when all the CCDs 3, 4, 5 are displaced in the rotational direction.

Example 3. In the above-described embodiment, the means for obtaining the correction data for the registration deviation from the lens 1 by sending information to the correction data generating section 16 in real time is calculated, but the information of the lens 1 is measured in advance in several patterns. Memory as a data table or
It may be written in the ROM.

[0019]

As described above, when the present invention is applied to a multi-plate color camera or the like, registration shift due to chromatic aberration of magnification of the lens and CCD which have been impossible in the past are caused.
It is also possible to correct the rotation deviation of, and a beautiful image with no color deviation can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of a solid-state color imaging device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a configuration of a memory control unit included in the solid-state color imaging device according to the embodiment of the present invention.

FIG. 3 is a diagram showing a rotational shift of the solid-state image sensor according to the embodiment of the present invention.

FIG. 4 is a diagram illustrating an image displaced on a screen due to rotation displacement and registration displacement of a solid-state image sensor according to an embodiment of the present invention.

FIG. 5 is a diagram showing an image output to a screen in a state where a rotation shift and a registration shift of the solid-state image sensor according to the embodiment of the present invention occur.

FIG. 6 is a diagram showing an operation of correcting a rotation deviation and a registration deviation of the solid-state imaging device according to the embodiment of the present invention.

FIG. 7 is a diagram showing lateral chromatic aberration in a conventional imaging device.

[Explanation of symbols]

 1 Lens 2 Color Separation Optical System 3 CCD (B) 4 CCD (G) 5 CCD (R) 6, 7, 8 A / D Converter 9, 10, 11 Memory 12, 13, 14 D / A Converter 15 Memory Control unit

Claims (1)

[Claims] 1. A color separation optical system for separating an object image into three primary color lights, a plurality of solid-state image pickup devices for converting each of the separated three primary color lights into electric signals, and a plurality of units for converting each of the electric signals into digital signals. A / D converter, a plurality of memories for storing the converted digital signals, and addresses of the plurality of memories are read while being corrected in accordance with information on registration deviation and CCD rotational direction deviation. And a plurality of D / A converters for converting the signals read from the plurality of memories into analog signals.