JPH053568A - Video camera apparatus - Google Patents

Abstract

PURPOSE:To obtain the pictures of satisfactory quality without color slurring by correcting chromatic aberration, which is generated by a photographic lens equipped with a zoom lens or the like, by an image processing. CONSTITUTION:Beams made incident from an object are passed through the four group types of zoom lens composed of a focusing lens 22, variator lens 23, compensator lens 24 and relay lens 25 and form an image on a CCD 2. Video signals for respective colors R, G and B extracted from the CCD 2 are temporarily converted to digital data and respectively temporarily stored in individual field memories 11-13. Further, based on photographic lens driving states such as the zoom focal distance information and focal position information of the photographic lens, the image processing is executed to synthesize the colors R, G and B again after the respective field memories are entirely and individually vector-moved two-dimensionally and therefore, the chromatic aberration generated at the photographic lens of the video camera is corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera device for correcting chromatic aberration generated by a photographing lens including a zoom lens by image processing.

[0002]

2. Description of the Related Art In recent years, video equipment such as a video camera has been remarkably developed, and has rapidly become popular due to improvement in operability due to reduction in size and weight.

A photographic lens optical system used in a video camera usually uses a zoom lens of a four-group type, etc., but with the miniaturization of the video camera, the image pickup device is miniaturized, and as a result, the photographic lens itself is also used. Inevitably, miniaturization is in progress.

[0004]

However, as the downsizing of the taking lens progresses in this way, it becomes difficult to maintain optical performance sufficiently with respect to resolving power and aberrations, as shown in FIG. In addition, the influence of lateral chromatic aberration caused by the dispersion characteristics of the optical material used for the lens becomes a serious problem in maintaining the image performance.

FIG. 3 shows a state in which incident light from a subject is imaged on the image pickup element through the taking lens as shown in FIG. 2 separately for each wavelength (red, green, blue). It is a thing. Thus, due to the difference in the refractive index of each wavelength,
The image size of the red component shown in (a) is larger than the image size of the green component shown in (b),
Since the image size of the blue component shown in (c) is smaller than the image size of the green component shown in (b),
A large color shift occurs in the final image in which the respective wavelengths are combined.

[0006]

The present invention has been made for the purpose of solving the above-mentioned problems, and is characterized in that a photographing lens and subject information passed through the photographing lens are converted into an electric signal. Image pickup means for converting, color signal converting means for inputting a signal from the image pickup means and converting into a plurality of color signal information for each pixel, detecting means for detecting a driving state of the photographing lens, and the detecting means Control means for changing the color signal conversion coefficient by the color signal conversion means in accordance with the output of the above.

[0007]

With this structure, the image signals for each color of R, G, and B taken out from the CCD are once converted into digital data and temporarily stored in the individual field memories, and the zoom of the photographing lens is further performed. Focal length information,
Based on the driving state of the photographing lens such as focus position information, the entire field memory is individually vector-moved, and then image processing is performed such that R, G, and B are combined again, so that photographing by the video camera is performed. It is possible to correct the color shift that occurs in the lens.

[0008]

Embodiments of the video camera device according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a circuit configuration of the entire video camera according to the present invention, which is composed of a drive control unit of a video lens and a signal processing unit of the video camera.

First, incident light from a subject is focused on an image pickup device 2 such as a CCD through a four-group type zoom lens composed of a focusing lens 22, a variator lens 23, a compensator lens 24 and a relay lens 25. . The CCD 2 is a CCD for color signals in which color filters of R, G, B, etc. are alternately provided on each pixel on its image pickup surface, and the image data accumulated therein is converted into a signal generated by a timing generation circuit. Synchronous, horizontal component is H
The (horizontal) drive 3 reads data sequentially in the vertical direction under the control of the V (vertical) drive 4. The signal output from the CCD is taken in by the sample hold circuit b in synchronism with the signal from the timing generation circuit 5, and then the preamplifier 7 performs a predetermined level amplification and the AGC 8 changes the brightness. The gain is automatically adjusted so that the amplifier and the like are not saturated, and finally, gamma correction for setting the gamma characteristic (photoelectric conversion characteristic) of the entire system to 1 is executed and then input to the A / D converter 10. In the A / D converter 10, an analog video signal for each pixel from the CCD 2 is converted into a digital value by a command signal from the system control CPU, and its output data is a red video signal under the control of the CPU. Is stored in the R field memory 11, the green video signal is stored in the G field memory 12, and the blue video signal is stored in the B field memory 13.

D which is a microprocessor for image processing
Inside the SP14, when a video signal for one screen is stored in each field memory, an image vector moving calculation to be described later is executed for each field memory based on the calculation data from the CPU 1, and for each pixel. The luminance output and the color difference output are output as digital values. The output of the DSP 14 is an analog luminance signal (Y) at the D / A converter 15, an analog color difference signal (RY) at the D / A converter 16, and an analog color difference signal (BY) at the D / A converter 17. ), Each color signal is finally modulated by the color modulation video output circuit 18 and output as a video (video) output multiplexed with the luminance signal.

Next, the video lens driving section will be described. When the photographer operates a zooming operation button (not shown) for zooming, the CPU 1 detects this and sends a command signal (to the motor driver circuit 27). Motor forward rotation, reverse rotation) is output. The motor 26
The variator lens 23 and the compensator lens 24 are moved in the optical axis direction by this driving force, which is rotated by the energizing current from the driver circuit, and a predetermined zooming movement is executed. Further, along with the movement of the lens, the current focal length information of the photographing lens is detected by the zoom position detection circuit 28.

On the other hand, the image signal from the CCD 2 is input to the AF processing circuit 19 through the sample and hold circuit, and here, the focus state of the image is detected to judge whether it is the front focus or the rear focus. At the output of the AF processing circuit, the energization control to the motor 21 is executed through the motor driver circuit 20, and the autofocus operation is performed by the back and forth movement of the focusing lens 22 in the optical axis direction. Further, the current position information of the current focusing lens 22 is detected by the focus position detection circuit 29.

FIG. 4 is a diagram in which the pixel array of the CCD 2 is separately mapped on the coordinates corresponding to the array of the field memory for each of R, G, and B in order to simplify the expression. In FIG. 4, there are m + 1 pixels in the X direction from 0 to m, of which pixels actually used for shooting are from S to t, and similarly, there are n + 1 pixels in the Y direction from 0 to n. Pixels used for actual photographing are from P to q. The effective dimension of one pixel is represented by Δx in the X direction and Δy in the Y direction.

FIG. 5 shows the relative relationship of each pixel information mapped for each of the R, G and B color signals shown in FIG. In (a), the blue component of the light emitted from a certain point on the subject is the coordinates.

[0016]

[Outer 1] It means that it is incident on the position of, and based on the information of the focal length and dispersion of the actual shooting lens,
The aberration component is corrected and developed on the coordinate representing the green component of the same light, as shown in (b). As described above, when the aberration component is taken into consideration, the information of the pixel having the blue component moves to the shaded portion (b) on the coordinate axis of the green component. Is the pixel of the blue component, the coordinates on the original blue coordinate axis

[0017]

[Outside 2] Will include the pixel located at.

Similarly, in (c), the red component is the coordinate.

[0019]

[Outside 3] It means that the light is incident on the position of, and (d) is developed on the coordinate axis of the green component in consideration of the aberration.

Next, the operation actually performed inside the DSP 14,
A method of correcting chromatic aberration by vector movement calculation will be described with reference to FIGS. 6, 7, and 8.

First, FIGS. 6B and 6C show a table in which the aberration correction coefficients K _B and K _R according to the focal length information f _M and the focus lens movement amount ΔN are stored, and from this table, f _M, is a diagram showing how the aberration correction factor is determined in accordance with the .DELTA.N. In the flow 200 of FIG. 6A,
The current focal length information f _M of the photographing lens is stored in the zoom position detection circuit 28, the A / D converter 31, and the CPU 1 via the CPU 1 in the a register inside the DSP 14. Similarly, in the flow 201, the optical axis of the focus lens 22 is stored. The movement amount ΔN in the direction is stored in the b register inside the DSP 14 via the focus position detection circuit 29, the A / D converter 31, and the CPU 1. Next, in flows 202 and 203, the value of the aberration correction coefficient K _B (a, b) for blue light is set in the internal register K ₁ based on the values of the a register and the b register, and the aberration correction coefficient for red light is set. K _R
The values of (a, b) are set in the internal register K ₂ , and in flows 204 and 205, data m / 2 and n / 2 indicating the center position on the coordinate axes are set in the C _X and C _Y registers, respectively. It

Then, in flows 206, 207 and 208, the initial operation of the pointer for sequentially accessing each address of the filled memory is performed. In the flow 206, the start address S in the X direction is set in the X ₁ register as shown in FIG. 4, and in the flow 207 the start address P in the Y direction is set in the Y ₁ register.
At 08, the I pointer for controlling the interlacing in the vertical direction when actually fetching the data on the field memory as the video output is reset to 0.

In FIG. 7, first, in flow 210, the value of M _G (X ₁ , Y ₁ ) of the G field memory 12 addressed by the values of the X ₁ register and the Y ₁ register is set in the A register. Next, in flow 21, the value of the C _X register is subtracted from the value of the X ₁ register, and the value of the aberration correction coefficient K _B (a, b) for blue light is set to that value of the register K ₁ . By performing the division by the value, the value of the X coordinate of the originally imaged position of the blue light on the CCD is set in the X ₂ register at the imaged position of the green light on the CCD. Then, the flow 212
In, only the integer part of the value of the X ₂ register is set in the X ₃ register, and in flow 213, the value of the X ₂ register is subtracted from the value of the X ₃ register, and the result is set in the X ₂ register. . Therefore, by the above calculation, the integer part of the deviation amount of the image forming position of the blue light with respect to the image forming position of the green light is set in the X ₃ register, and the decimal part is set in the X ₂ register. . Next, in flow 214, the value of the X ₂ register is changed from −0.5 to +0.5.
Between -0.5 and +0.5
If it is between the two, the flow advances to flow 215, the value of the X ₃ register and the value of the C _X register are added, and the result is set in the X ₃ register. On the other hand, the flow 214 with the value of X ₂ register is advanced to the flow 216 when not between -0.5 +0.5, where it is made positive and negative determination of X ₂ registers, X ₂ register values Is positive, the flow 217 adds 1 to the value of the X ₃ register, further adds the value of the C _X register, and sets the result in the X ₃ register. When the value of the X ₂ register is negative in the flow 216, 1 is subtracted from the value of the X ₃ register in the flow 218, the value of the C _X register is further added, and the result is set in the X ₃ register. . Next, in the flow 219, as in the X direction, the Y coordinate value of the image forming position of the blue light on the CCD, which corresponds to the image forming position of the green light on the CCD, is set in the Y ₂ register, and the flow 22.
Through 0, 221, the integer part of the data is set in the Y ₃ register and the decimal part is set in the Y ₂ register. Then, when the value of Y ₂ is between −0.5 and 0.5 in the flow 222, the value of the Y ₃ register and the value of the C _Y register are added in the flow 223 and set in the Y ₃ register. It When the value of Y _{2 in} the flow 222 is not between −0.5 and 0.5, whether the value of Y ₂ is positive or negative is determined in the flow 224. Here, when the value of Y ₂ is positive, Y _{3 is determined.} 1 is added to the register, the value of the C _Y register is added, and the value is set in the Y ₃ register. If the value of Y ₂ is negative in flow 224, 1 is subtracted from the value of the Y ₃ register in flow 226, and the value of the C _Y register is added,
Set in the Y ₃ register.

As described above, finally, the X ₃ register,
In the Y ₃ register, the vector calculation for color correction for the above blue light is performed, and the G field memory M _G
Of the data in the B-filled memory corresponding to the portion (X ₁ , Y ₁ ), the address of the memory in which the pixel data closest in position is stored is set, and in flow 227, the data M _B (X ₃ , Y ₁ ) is set. ₃ ) is set in the B register.

Next, in Flows 228 to 244, chromatic aberration with respect to red light is similarly corrected. First, in the flow 228, the value of the C _X register is subtracted from the value of the X ₁ register, and the aberration correction coefficient K of the red light is subtracted from the value.
By performing the division with the value of the register K _{2 in which} the value of _R (a, b) is set, the image of the red light corresponding to the image forming position on the CCD of the green light is formed on the CCD. Position X
The coordinate value is set in the X ₂ register. Then, the integer part X ₃ registers flow 229, 230 in the X ₂ register, after the fractional part is set after being respectively converted into X ₂ register, the value of X ₂ registers in the flow 231 -0.5 From 0.5 to 0.5, and if so, in flow 232, the value of the X ₃ register and the value of the C _X register are added, and the result is X ₃
Set in register. When the value of the X ₂ register is not between −0.5 and 0.5 in the flow 231, whether the X ₂ register is positive or negative is determined in the flow 233, and when the value of the X ₂ register is positive, X _{3 is determined.} The value of the register is incremented by 1, the value of the C _X register is further incremented, and the result is set in the X ₃ register. When X ₂ is negative in flow 233, 1 is subtracted from the value of the X ₃ register in flow 235, the value of the C _X register is added to the result, and the result is set in the X ₃ register.

Next, in the flow 236, as in the X direction, the Y coordinate value of the image forming position of the blue light on the CCD corresponding to the image forming position of the green light on the CCD is set in the Y ₂ register. In the flow 237 and 238, the integer part of the data is set in the Y ₃ register and the decimal part is set in the Y ₂ register. Subsequently, when the value of Y ₂ is between −0.5 and 0.5 in the flow 239, the value of the Y ₃ register and the value of the C _Y register are added in the flow 240 and set in the Y ₃ register. To be done. When the value of the Y ₂ register is not between −0.5 and 0.5 in flow 239, flow 24
If the value of the Y ₂ register is positive, the flow proceeds to step 1 where 1 is added to the value of the Y ₃ register, and the value of the C _Y register is added. The result is set in the Y ₃ register. When the value of the Y ₂ register is negative in flow 241, flow 243
Then, 1 is subtracted from the value of the Y ₃ register, the value of the C _Y register is added to the value, and the result is set in the Y ₃ register.

As described above, in the X ₃ register and the Y ₃ register, the G field memory M _G (X ₁ , Y ₁ ) is stored as the result of the vector calculation for color correction for red light.
Of the data in the B-field memory corresponding to the part of the above, the address of the memory in which the pixel data closest in position is stored is set, and the data M in flow 244 is set.
_R (X ₃ , Y ₃ ) is set in the C register.

As described above, in each of the A, B, and C registers, the image forming position on the CCD 2 for green light is used as a reference.
The blue light and red light pixels corresponding to the image formation position are calculated. In the flow 250, the mixing ratio of green, blue and red is a
_{As 1} , b ₁ and c ₁ , the calculation of a ₁ × A + b ₁ × B + c ₁ × C is executed, and the luminance output at the positions of addresses X ₁ and Y ₁ (referenced to green light) is set in the D _Y register. . Next, in flow 251, the mixing proportions of green, blue, and red are calculated as a ₂ , b ₂ , and c _2.
Then, the calculation of a ₂ × A + b ₂ × B + c ₂ × C is executed, and the color difference output (red-luminance) at the positions of the addresses X ₁ and Y ₁ is performed.
Is set in the D _RY register <Next, in the flow 252, the mixing ratio of green, blue, and red is set as a ₃ , b ₃ , c ₃ and a ₃ × A
The operation of + b ₃ × B + c ₃ × C is executed, and the color difference output (blue-luminance) at the positions of the addresses X ₁ and Y ₁ is set in the D _BY register. The values of D _Y , D _RY and D _BY are transferred to the D / A converters 15, 16 and 17, respectively, as described above, and are output as analog outputs Y, _RY and _BY in accordance with a predetermined timing. Will be.

Subsequently, in flow 253, 1 is added to the value of the X ₁ register in which the address in the X direction of each field memory (in this case, green is standard) is set as shown in FIG. 4, and flow 254 At, it is determined whether the value of X ₁ is larger than t (the maximum value of the effective area in the X direction). If the value of X ₁ is not greater than t, then flow 210
Returning to, the above operation is executed for the next address.
When the value of X ₁ is larger than t in the flow 254, s (the minimum value of the effective area in the X direction) is set in the X ₁ register in the flow 255, and then the value of the Y ₁ register is set to 2 in the flow 256. Is added. 2 here in the Y ₁ register
The reason why the three values are added is to correspond to the interlacing (interlaced scanning) of the television. In flow 257, it is determined whether or not the value of the Y ₁ register is larger than q (the maximum value of the effective area in the Y direction). If the value of Y ₁ is not larger than q, the flow returns to flow 210 and the operation for the next address is performed. However, if the value of Y ₁ is larger than q, the value of p (the minimum value of the effective area in the Y direction) +1 is set in the Y ₁ register in flow 258. Next, in flow 259, 1 is added to the value of the I register for counting the number of fields, and subsequently in flow 260, it is determined whether or not the value of I has reached 2. If not, the next The calculation for the field is started again from the flow 210, but when I reaches 2, it is determined that the above calculation for one screen is completed, and the calculation for the next screen (1 screen for 2 fields) is performed. It will be started from the flow 200.

(Second Embodiment) A concrete method of the second embodiment of the present invention will be described with reference to the flowcharts of FIGS. 9 and 10. It should be noted that FIGS. 9 and 10 are obtained by modifying the portions corresponding to FIG. 7 of the first embodiment, and the portions of FIGS. 6 and 8 are exactly the same in the second embodiment as well, so the flow chart and description thereof will be omitted.

In the flows 300 to 303, exactly the same as the flows 210 to 213 in the first embodiment, the MG (X ₁ , Y ₁ ) of the G field memory 12 addressed by the X ₁ register and the Y ₁ register is first stored. The value is set in the A register. Next, in flow 301, the value of the C _X register is subtracted from the value of the X ₁ register, and the value of the aberration correction coefficient K _b (a, b) for blue light is set to that value of the register K ₁ By executing the division in step 1, the value of the X coordinate of the image forming position of the blue light on the CCD, which originally corresponds to the image forming position of the green light on the CCD, is set in the X ₂ register. The integer part of X ₂ registers the flow 302 is set to X ₃ register, flow 30
At 2, the value of the X ₃ register is subtracted from the value of the X ₂ register, and the result is set in the X ₂ register.

Therefore, similarly to the first embodiment, the integer part of the amount of deviation of the image forming position of blue light with respect to the image forming position of green light as a reference is stored in the X ₃ register, and the decimal part is stored in the X ₂ register. Will be set. Flow 304 in X ₂ when the value of the register is whether 0.75 or greater than the determination is carried out of the X ₂ register value is greater than 0.75 the flow 3
05 1 to the value of X ₃ registers are added, the further C _X value of the register is added, the after result is set to X ₃ registers, flow 310 at X ₃ value of the register is X ₄
It is also set in the register. If the value of the X ₂ register is not greater than 0.75 in flow 304, flow 30
The value of X ₂ register 6 is made a determination whether -0.75 smaller, when the value of X ₂ is -0.75 less than 1 from the value of X ₃ registers in the flow 307 is subtracted, further The values in the C _X register are added and the result is X ₃
It shall be set in the register and proceed to flow 310. Next, in flow 306, the value of the X ₂ register is −0.
When not less than 75, the value of X ₂ registers in the flow 308 a determination is made whether there between +0.25 from -0.25, where the value of X ₂ is from -0.25 +
If it is between 0.25, in flow 309, the value of the C _X register is added to the value of the X ₃ register and the result is X ₃
It is set in the register and the process proceeds to the flow 310. On the other hand, in flow 308, the value of the X ₂ register is −0.
When it is not between 25 and +0.25, X _{2 in} flow 311
If the positive / negative judgment of the register is made and the value of the X ₂ register is positive, the value of the X ₃ register and C _X are checked in flow 312.
The value of the register is added and the result is set in the X ₃ register, and then the result of adding 1 to the value of the X ₃ register in flow 313 is set in the X ₄ register. When the value of the X ₂ register is negative in the flow 311, the value of the X ₃ register and the value of the C _X register are added in the flow 314, the result is set in the X ₃ register, and then in the flow 315. The result of subtracting 1 from the value of the X ₃ register is set in the X ₄ register. Similarly, the vector calculation flows 316 to 330 in the Y direction are calculated by the same method as the flows 301 to 315. Here, an address closest to the vector-converted result is set in each of the X ₃ , X ₄ , Y ₃ , and Y ₄ registers. For example, a pixel and a pixel in which the converted result in each of the X and Y directions are almost present. When it comes to the middle of the adjacent pixel, both addresses are set to X ₃ , X _{4 for} the X direction and Y ₃ , Y ₄ for the Y direction, respectively, and the converted result is When it is included in almost one pixel, its address is X ₃ for the X direction, X ₄ for the X direction, and Y ₃ , Y ₄ for the Y direction.
It will be set in both registers. Therefore, in the flows 331 to 334, this register X ₃ , X ₄ , Y
Addressable by a combination of ₃ , Y ₄ M _B (X ₃ ,
Y ₃ ), M _B (X ₄ , Y ₃ ), M _B (X ₃ , Y ₄ ), M
The addition result of _B (X ₄ , Y ₄ ) is set in the B register, and the average value thereof is obtained in flow 335 and set in the B register.

The vector operation for red light is calculated in the same manner as in the flows 301 to 335 in the flows 336 to 370 in FIG.

In this way, the color information of the blue light and the red light corresponding to the image forming position is effectively stored in each of the A, B and C registers with the image forming position of the green light on the CCD 2 as a reference. It is calculated.

(Third Embodiment) A specific method of the third embodiment of the present invention will be described with reference to the flowcharts of FIGS. 11 and 12. 11 and 12 are the portions corresponding to FIG. 7 of the first embodiment, and the portions corresponding to FIGS. 6 and 8 of the first embodiment are exactly the same, so the flow chart and description will be omitted.

In the flows 400 to 402, as in the flows 210 to 212 of the first embodiment, the X ₁ register and the Y ₁ register (addressed G field memory 1) are registered.
The value of M _G (X ₁ , Y ₁ ) of 2 is set in the A register. Next, in flow 401, the value of the X ₁ register is changed to C _X.
The value of the register is subtracted, and the value of the aberration correction coefficient K _B (a, b) for blue light is set to the value to perform division by the value of the register K _1. The X coordinate value of the image forming position of the blue light on the CCD corresponding to the above image forming position is set in the X ₂ register.

The integer part of the flow 402 X ₂ register is set to X ₃ register, the next flow 403 is performed the negative determination, but if the value of X ₂ is negative the process proceeds to the flow 411, X ₂ If the value of is positive, the flow advances to step 404 to add 1 to the value of the X ₃ register and the result is set in the X ₄ register.

Therefore, in the X ₃ and X ₄ registers, the pixel M at the position indicated by the coordinates of X ₁ and Y _{1 after} being vector-converted
Addresses in the X direction of two consecutive pixels on the coordinate axis of the blue component closest to _G (X ₁ , Y ₁ ) are set.

Next, in flow 405, 0.5 as 0.5 pixel is added to the X ₃ register, the result is multiplied by the value of the register K ₁ described above, and then the result is set to the X ₅ register. . Subsequently, in flow 406, the value of the C _X register is subtracted from the value of the X ₁ register, 0.5 is further added, and then the value is set in the X ₂ register.

In the flow 407, the value of the X ₅ register is compared with the value of the X ₂ register, and when the value of the X ₅ register is larger than the value of the X ₂ register, the data value in the X ₄ register. It is determined that there is no ratio included in the X-direction address portion indicated by, and the value of the T _X4 register is reset to 0 in flow 408. When the value of the X ₅ register is smaller than the value of the X ₂ register, the ratio included in the X direction address portion indicated by the data value in the X ₄ register in the flow 409 is calculated from the value of the X ₂ register to X ₅ register.
The value in the register is subtracted and set in the T _X4 register. In the flow 410, as a ratio included in the X-direction address portion indicated by the data value in the X ₃ register,
The value in the T _X4 register is subtracted from 1 and the result is T _X3
Set in register.

On the other hand, when the value of the X ₂ register is negative, 1 is subtracted from the value of the X ₃ register in flow 411 to obtain X ₄
Since it is set in the register, the blue component closest to the pixel _MG (X ₁ , Y ₁ ) at the position indicated by the coordinates X ₁ , Y ₁ after being vector-converted to the X ₃ , X ₄ registers Addresses in the X direction of two consecutive pixels on the coordinate axis of are set. Next, in flow 412, 0.5 as 0.5 pixel is subtracted from the X ₃ register, the result is multiplied by the value of the register K ₂ described above, and then the result is set in the X ₅ register. Subsequently, in a flow 413, the value of the C _Y register is subtracted from the value of the X ₁ register, 0.5 is further subtracted, and then the value is set in the X ₂ register.
In the flow 414, the value of the X ₅ register is compared with the value of the X ₂ register, and when the value of the X ₅ register is smaller than the value of the X ₂ register, X indicated by the data value in the X ₄ register is shown. It is determined that there is no ratio included in the direction address portion, and the value of the T _X4 register is reset to 0 in flow 415. When the value of the X ₅ register is smaller than the value of the X ₂ register, as a ratio included in the X direction address portion indicated by the data value in the X ₄ register in the flow 416, the value of the X ₅ register is changed to the value of the X ₂ register. The value is subtracted and set in the T _X4 register. Flow 4
In 17, the value of the T _X4 register is subtracted from 1 as the ratio contained in the X-direction address portion indicated by the data value in the X ₃ register, and the result is set in the T _X3 register.

Similarly, in Flows 418 to 434, the vector operation in the Y direction is performed, and the method is Flow 401.
The description is omitted because it is exactly the same as ˜417.

Therefore, the X ₃ , X ₄ , Y ₃ , and Y ₄ registers are subjected to vector conversion for chromatic aberration correction, and then are indicated by the coordinates of the values of X ₁ and Y ₁ in the green component. Addresses of consecutive pixels in the blue component closest to the pixel M _G (X ₁ , Y ₁ ) at the different positions are set, and further, T _X3 ,
The ratios contained in consecutive pixels in the X and Y directions are set in the T _X4 , T _Y3 , and T _Y4 registers, respectively. Therefore, in the flows 435 to 438, M _B
As a result of multiplying (X ₃ , Y ₃ ) by the content rates T _X3 , T _Y3 , M
As a result of multiplying _B (X ₄ , Y ₃ ) by the content rates T _X4 and T _Y3 ,
As a result of multiplying M _B (X ₃ , Y ₄ ) by the content ratios T _X3 , T _Y4 , all of the results of multiplying M _B (X ₄ , Y ₄ ) by the content ratios T _X4 , T _Y4 are added. It is set in the B register.

The vector operation for the red light is also calculated in the flows 439 to 476 of FIG. 12 in exactly the same manner as the flows 401 to 438, and the explanation thereof will be omitted.

In this way, the color information of the blue light and the red light corresponding to the image forming position is accurately calculated in each of the A, B and C registers with the image forming position of the green light on the CCD 2 as a reference. It

[0046]

As described above, in a video camera equipped with a zoom lens or the like, the chromatic aberration of the taking lens, which changes depending on the focal length, AF, etc., is corrected by R, G, and R in the signal processing circuit on the video camera side. By executing the vector operation for each color information of B, it is possible to remove the color information, and it is possible to realize a good-quality video camera device with no color shift.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a video camera device according to the present invention.

FIG. 2 is a diagram for explaining chromatic aberration due to a photographing lens.

FIG. 3 is a diagram showing an image formed on an image pickup element through a taking lens, the image being separated for each wavelength of each color.

FIG. 4 is a diagram showing a pixel array of a CCD.

FIG. 5 is a diagram showing a relative relationship between pieces of pixel information formed on an image pickup screen of a CCD.

FIG. 6 is a diagram showing a flowchart for explaining a chromatic aberration correction operation in the present invention and a table for selecting an aberration correction coefficient.

FIG. 7 is a flowchart for explaining a chromatic aberration correction operation in the present invention.

FIG. 8 is a flow chart for explaining a chromatic aberration correction operation in the present invention.

FIG. 9 is a flow chart for explaining a second embodiment of the chromatic aberration correction operation in the present invention.

FIG. 10 is a flow chart for explaining a second embodiment of the chromatic aberration correction operation in the present invention.

FIG. 11 is a flow chart for explaining a third embodiment of the chromatic aberration correction operation in the present invention.

FIG. 12 is a flow chart for explaining a third embodiment of the chromatic aberration correction operation in the present invention.

Claims (7)

[Claims] 1. A photographic lens, an image pickup means for converting subject information passed through the photographic lens into an electric signal, and a color inputted with a signal from the image pickup means and converted into a plurality of color signal information for each pixel. A signal conversion unit, a detection unit that detects a driving state of the photographing lens, and a control unit that changes a color signal conversion coefficient by the color signal conversion unit according to an output of the detection unit. Video camera device. 2. The detecting means according to claim 1, further comprising: a focus position detecting means for detecting a focus position of the photographing lens; and a zoom focal length detecting means for detecting a zoom focal length of the photographing lens. A video camera device characterized in that 3. The video camera device according to claim 2, wherein the color signal conversion means includes an A / D conversion means for converting each pixel signal output from the image pickup means into a digital value. 4. The video according to claim 2, wherein the color signal conversion means comprises memory means for digitally storing signal output for each color and each pixel from the image pickup means. Camera device. 5. The memory device according to claim 4, wherein the memory means is provided with 2 pixels depending on a position of each pixel included in the image pickup means.
A video camera device characterized in that data is arranged three-dimensionally. 6. The color signal conversion means according to claim 2, wherein the two-dimensional array of the signal data for each color and each pixel from the image pickup means is changed in both X and Y directions. A video camera device, characterized in that it is provided with a vector moving means. 7. The color signal converting means according to claim 2, wherein the color signal converting means includes a matrix calculating means for performing a calculation by combining the signal data for each color and each pixel from the image pickup means with each other. Video camera device.