JP2004135206A - Pixel signal color mixture reduction apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color mixture reduction apparatus for reducing pixel-like non-uniformity caused by color mixture trouble of imaging device output pixel signals in a primary color single plate digital camera. <P>SOLUTION: The pixel signal color mixture reduction apparatus is provided with a correction processing means (103) for subtracting signal components of a fixed ratio which is calculated from pixel signals except for a specific color transversely adjacent with specific color pixel signals from the specific color pixel signals, and a processing stop instruction means (104) for instructing stop of adjacent pixel signal leakage reduction correction processing to the specific color pixel signals when the specific color pixel signals reach a saturation level. Even in the case of a pixel signal transversely adjacent to a correction target pixel signal and the correction target pixel signal, when its signal level is saturated, a correction target pixel signal which is not corrected by the correction processing means (103) is selectively outputted and when the signal level of the correction target pixel signal is not saturated, a corrected pixel signal which is corrected by the correction processing means (103) is selectively outputted, thereby reducing pixel signal level non-uniformity (dispersion) and suppressing occurrence of trouble in the correction processing means (103) when the pixel signal level is saturated. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a process for suppressing a color mixing problem of an image sensor output pixel signal in a single-color digital camera with primary colors. More specifically, the pixel size of the pixel signal is reduced due to the mixture of colors due to leakage of signals to adjacent pixels due to the miniaturization of the pixel size accompanying the increase in the number of pixels of the image sensor, and the color mixture due to leakage of horizontal transfer especially due to the high-speed drive accompanying the increase of the pixels of the image sensor. The present invention relates to a process for suppressing color mixing defects that reduces unevenness (variation) in signal levels.
[0002]
[Prior art]
The basic structure of a CCD image sensor (image sensor) will be described using an example of an IT-CCD (Interline Transfer Charge-Coupled-Device).
[0003]
In the IT-CCD, photodiodes (hereinafter, referred to as PDs) that photoelectrically convert light information of a subject into charge information (image signals) are arranged in a matrix, and a vertical CCD is provided between PDs in each row. Are arranged. A horizontal CCD is arranged at one end of the vertical CCD, and a charge detection unit and an output circuit (signal output terminal) are provided at an end of the horizontal CCD.
[0004]
The CCD image sensor sequentially performs four basic operations of photoelectric conversion, charge accumulation, charge transfer, and charge detection, and converts a two-dimensional image into an electric signal and outputs the electric signal.
That is, the incident light is converted into charges (electrons) by the PD and stored. The signal charges stored in the PD are simultaneously transferred to the vertical CCD. The signal charges transferred to the vertical CCD are transferred to the horizontal CCD sequentially from the side (line) closer to the horizontal CCD. The signal charges for each line are sent to the charge detection unit one pixel at a time from the side (pixels) closer to the charge detection unit by the horizontal CCD, converted into a voltage, and appear at the signal output terminal. By repeating these basic operations, all lines are output to form an image of one screen.
[0005]
As described above, after the charge detection of all the pixels of one line transferred to the horizontal CCD is performed, the vertical transfer is performed only for one line. Therefore, the horizontal transfer / charge detection processing (charge detection After discarding the completed signal charge, the next signal charge is transferred to the charge detection unit to perform charge detection. Such processing is performed for each pixel.) The cycle is much shorter and the processing is faster. .
[0006]
Further, on the PD that performs photoelectric conversion, color filters that perform color separation of optical information are arranged in a matrix as shown in FIG. FIG. 33 shows an example of an RGB Bayer array color filter.
[0007]
After transmitting the light information through the color filter, the light enters the PD and is converted into signal charges, so that the color information can be identified at the same time as the brightness of the light.
These conventional techniques are described in, for example, (Non-Patent Document 1).
[0008]
[Non-patent document 1]
"Introduction to CCD Camera Technology" by Hiroo Takemura Publisher: Corona
First published December 1997, pages 23-35
[0009]
[Problems to be solved by the invention]
With the recent increase in the number of pixels in the CCD image pickup device, the pixel size has been reduced in order to make the optical system (lens) more compact, and the driving speed has been increased to increase the surface update rate.
[0010]
A problem in miniaturizing the pixel size accompanying the increase in the number of pixels will be described.
34 (a) and 34 (b) are schematic cross-sectional views in the horizontal direction of the pixel portion (composed of a PD and a vertical CCD) of the CCD image sensor. 34 (a) and 34 (b) use the same numbers. Reference numeral 10 denotes a microlens for increasing the light collection rate, 12 denotes a color filter, 13 denotes a light-shielding film for preventing light from entering when signal charges are vertically transferred by a vertical transfer CCD, and 14 denotes a vertical light-shielding film. A transfer electrode / signal charge readout electrode, 15 is a vertical CCD, 16 is a signal charge readout unit, 17 is a PD, and 18 is incident light.
[0011]
FIG. 34B shows a state in which the pixel size is becoming finer with the increase in the number of pixels as compared to FIG. As can be seen from FIG. 34B, the pitch between the pixels is narrowed, and light condensed by the microlens 10 and passing through the color filter 12 is likely to leak to the vertical CCD 15 on both sides horizontally and the PD 17 on both sides vertically.
[0012]
Next, a description will be given of a problem in driving a CCD image pickup device at a high speed with an increase in the number of pixels.
FIG. 35A shows that the RGB signal charges stored in the PD2 are read out to the VCCD 1 at the same time. FIG. 35B shows that the RGB signal charges transferred to the VCCD 1 are vertically transferred line by line and FIG. 36 (a) shows that the signal charge of the nearest line is transferred to the horizontal CCD 3, and FIG. 36 (a) shows that the signal charge of the pixel near the charge detection unit 4 is transferred to the charge detection unit 4 one pixel at a time. FIG. 37 (b) shows that the pixel signals of the line closest to the horizontal CCD 3 are converted into voltages and outputs them. FIG. 37 (a) shows that all the pixel signals of the line closest to the horizontal CCD 3 are converted and output as voltages. Then, the VCCD 1 is vertically transferred one line at a time, and the signal charges of the line closest to the horizontal CCD 3 are transferred to the horizontal CCD. FIG. 37 (b) is similar to FIG. 36 (a). FIG. 37 (c) shows that the signal charge of the pixel closest to the load detection unit is sent to the charge detection unit 4 one pixel at a time. I am doing it.
[0013]
If the RGB signal charges are ideally read, no problem occurs. However, as described above, horizontal transfer and signal charge detection, particularly signal charge detection, perform signal charge detection and voltage conversion one pixel at a time as compared with vertical transfer. After the signal charge detection and voltage conversion, the signal charge is discharged by the reset pulse signal, and then the next signal charge detection and voltage conversion processing is performed. With the driving, the signal charges after the signal charge detection and voltage conversion processing cannot be completely discharged, and the signal charges easily remain. The remaining signal charge remaining and the next signal charge are mixed, and the RGB pixel signal actually read from the CCD image pickup device is in a state where the signal charge has laterally leaked.
[0014]
As described above, under the influence of the leakage of the R signal and the B signal, pixel unevenness occurs due to a signal level difference between the G signal of the RG line and the G signal of the BG line.
Since both the R signal and the B signal are affected by the leakage of the G signal and are not pure R and B signals, there is degradation in spectral characteristics, but no pixel unevenness (line level difference) occurs.
[0015]
Next, the effect of light leakage and signal charge leakage on image quality will be described.
Generally, the signal level of the R component and the signal level of the B component mixed with the G signal are different due to the difference in transmittance between the R and B color filters. Therefore, the G signal and the BG of the RG line are used for a white / yellow / cyan object. Pixel unevenness (line level difference) occurs due to a signal level difference from the G signal of the line.
[0016]
If there is no difference between the transmittances of the R and B color filters, for a white subject, the R signal component and the B signal component leak to the G signal side in the same manner, so that pixel unevenness does not occur. In the subject, there is no leakage of the B signal component on the G signal side and only the R signal component leaks to the G signal side, and in the cyan subject, there is no leakage of the R signal component on the G signal side and only the B signal component is on the G signal side. , And pixel unevenness occurs.
[0017]
To increase the number of pixels in the CCD image sensor or downsize the CCD to make the optical system (lens) more compact, the pixel size has been reduced, and the high-speed driving has been promoted to increase the surface renewal rate as the number of pixels has increased. If this is the case, the above described defect of the image quality of the lattice pattern becomes remarkable. It is difficult to avoid the defect of the pixel-like unevenness image quality only by improving the characteristics of the CCD image pickup device.
[0018]
The present invention has been made in view of the above problems, and has as its object to provide a pixel signal color mixture reduction device capable of reducing pixel-like unevenness in a CCD camera system.
[0019]
[Means for Solving the Problems]
The pixel signal color mixture reduction device of the present invention performs a process of suppressing color mixture failure of a pixel signal having three primary colors of R (red), G (green), and B (blue) and in which a specific color is arranged in a checkered pattern. A pixel signal color mixture reduction device to be executed, comprising: a correction processing means for subtracting, from a specific color pixel signal, a fixed percentage of signal components calculated from pixel signals other than the specific color adjacent to the specific color pixel signal in the horizontal direction; A process stop command unit for commanding to stop the adjacent pixel signal leakage reduction correction processing for the specific color pixel signal when the color pixel signal reaches the saturation level.
[0020]
According to this configuration, for example, when the correction target image pixel signal is a G signal, leakage of the adjacent pixel signal component of the G signal or the R signal / B signal which causes a pixel unevenness (pixel signal level unevenness) is reduced. In addition, when the signal level of the G signal or the R signal / B signal is saturated, or when one of the G signal of the RG line and the G signal of the BG line is saturated, the adjacent pixel signal component The adverse effects of the leakage reduction correction are suppressed.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
(Embodiment 1)
FIGS. 1, 2 (a) and 2 (b), and FIGS. 3 to 8 show (Embodiment 1) of the present invention.
[0022]
FIG. 1 shows a pixel signal color mixture reduction apparatus according to the first embodiment of the present invention.
This configuration diagram is a diagram in the case where the driving clock cycle is the same as one pixel rate.
[0023]
Reference numerals 101 and 102 denote D flip-flops, which generate a pixel signal delayed by one pixel and a pixel signal delayed by two pixels from an original pixel signal (pixel signal without delay).
Reference numeral 103 denotes a correction processing means which is a pixel signal having three primary colors of R (red), G (green), and B (blue), of which specific colors are arranged in a checkered pattern. If not saturated, a certain percentage of signal components calculated from pixel signals other than the specific color, which are horizontally adjacent to the specific color pixel signal, are subtracted from the specific color pixel signal.
[0024]
Specifically, the correction processing unit 103 includes an average value calculation circuit 103a, a first signal switching circuit 103b, a leak signal component calculation circuit 103c, and a subtraction processing circuit 103d.
[0025]
The average value calculation circuit 103a receives the original pixel signal S0 and the pixel signal S2 delayed by two pixels by the D flip-flops 101 and 102 as input signals and a pixel to be corrected (a pixel signal delayed by one pixel in this configuration diagram). Of the pixel signals adjacent in the horizontal direction are calculated.
[0026]
The first signal switching circuit 103b uses the RG line / BG line discrimination signal CO1 as a switching signal, and sets the leakage ratio setting value N1 of the RG line R signal on the RG line G signal side and the BG line G signal side of the BG line B signal. Is switched and output.
[0027]
FIG. 2A shows a pixel G to be corrected when the pixel signal line to be corrected is an RG line. FIG. 2B shows a pixel G to be corrected when the pixel signal line to be corrected is a BG line.
[0028]
The leakage signal component calculation circuit 103c calculates the average value of the pixel signals adjacent in the horizontal direction of the correction target pixel calculated by the average value calculation circuit 103a and the leakage of the G signal output from the first signal switching circuit 103b. The leak signal component is calculated from the ratio setting value. Specifically, for example, when the register setting value of the leakage ratio is 8-bit data, the leakage signal component calculation circuit 103c calculates the average value of the pixel signals adjacent in the horizontal direction of the correction target pixel and the register setting value of the leakage ratio. After multiplying by the multiplication circuit, the bit shift down is performed to 1/256.
[0029]
The subtraction processing circuit 103d subtracts the leakage signal component on the G signal side calculated by the leakage signal component calculation circuit 103c from the correction target pixel signal (pixel signal delayed by one pixel in this configuration diagram).
[0030]
In this way, the correction processing unit 103 converts the leaked signal component into the horizontally adjacent pixel signal calculated inside the block of the correction processing unit 103 from the pixel signal (correction target pixel signal) delayed by one pixel. Subtract.
[0031]
Reference numeral 104 denotes processing stop command means for stopping the adjacent pixel signal leakage reduction correction processing for the specific color pixel signal when the specific color pixel signal reaches the saturation level. More specifically, the processing stop instruction means 104 includes a saturation / unsaturation determination circuit 104a and an OR circuit 104b. To the input of the OR circuit 104b, the output of the saturation / unsaturation determination circuit 104a and the output of the exclusive OR circuit 105b are input. The output of the drive clock divided by 2 signal generation circuit 105a and the line discrimination signal CO1 are input to the input of the exclusive OR circuit 105b.
[0032]
More specifically, since whether the G signal is an odd-numbered pixel signal or an even-numbered pixel signal changes depending on whether the G signal is an RG line or a BG line, the exclusive OR circuit 105b outputs the drive clock divided by 2 signal and the RG line signal. The exclusive OR of the BG line discrimination signal is used to obtain an “L” when the pixel signal delayed by one pixel on both the RG line and the BG line is a G signal. The pixel signal delayed by one pixel is an R signal on the RG line or BG. In the case of the B signal of the line, the signal of "H", that is, the G signal discrimination signal is output.
[0033]
When the pixel signal S1 delayed by one pixel is saturated (when the signal level is 1023), the saturation / non-saturation determination circuit 104a outputs 'H', and the pixel signal delayed by one pixel is not saturated. In this case (when the signal level is smaller than 1023), “L” is output.
[0034]
The OR circuit 104b outputs “H” when the pixel signal delayed by one pixel is the R signal of the RG line or the B signal of the BG line, or when both the RG line and the BG line are saturated with the G signal, the other 1 is output. When the pixel signal delayed by the pixel is a G signal (when the G signal is not saturated) on both the RG line and the BG line, the logical sum of the G signal discrimination signal and the output of the saturation / unsaturation discrimination circuit 104a is output so as to output "L". Take.
[0035]
In this way, the processing stop command means 104 acts as a switching signal generation block of the signal switching circuit 106, and when the pixel signal delayed by one pixel is the R signal on the RG line or the B signal on the BG line, or When the G signal is saturated in both the line and the BG line, “H” is output. When the other pixel signals delayed by one pixel are G signals in the non-saturated state, the output is “L”. .
[0036]
The signal switching circuit 106 is switched to output the pixel signal S1 delayed by one pixel when the phase of the switching signal generated by the processing stop instruction means 104 is "H", and the switching generated by the processing stop instruction means 104 is performed. When the phase of the signal is “L”, the correction processing unit 103 switches to the corrected pixel signal SS obtained by subtracting and correcting the leak signal component from the pixel signal S1 delayed by one pixel. As a result, in the case of the R signal / B signal and the G signal at the time of saturation, a pixel signal delayed by one pixel is output, and in the case of the G signal at the time of non-saturation, a pixel signal obtained by subtracting and correcting a leak signal component is output.
[0037]
The operation of the pixel signal color mixture reduction device configured as shown in FIG. 1 will be described with reference to FIGS.
An image sensor having a three-primary color filter array (Bayer array) as shown in FIG. 4 and having a signal level of 50% white, a signal level of 50% yellow, a signal level of 50% cyan, a signal level of 100% white, and a signal as shown in FIG. FIG. 5 shows the original ideal image sensor output when an image of a 100% yellow and 100% cyan signal level image is taken.
[0038]
3 to 8, the output of the image pickup device is shown in the form of a decimal number of 10-bit data.
R signal level = G signal level = B signal level
In this way, it is an ideal signal with color balance.
[0039]
For example, a 1/32 signal component of the RG line R signal is horizontally adjacent to the RG line G signal side, and a 1/16 signal component of the RG line G signal is horizontally adjacent to the RG line R signal side. A 1/16 signal component of the BG line G signal leaks into the BG line B signal side adjacent in the horizontal direction, and a 1/64 signal component of the BG line B signal leaks into the BG line G signal side adjacent in the horizontal direction. The signal data at this time is shown in FIG.
[0040]
Particularly problematic is the level difference between the G signal on the RG line and the G signal on the BG line when the G signal is not saturated (in FIG. 5 to FIG. 8, the R signal component of the RG line is adjacent in the horizontal direction). RG line G signal component, RG line G signal component horizontally adjacent to RG line R signal side, BG line G signal component is horizontally adjacent to BG line B signal side, BG line B signal Is described in the case where the amounts of the signal components leaking to the BG line G signal side adjacent in the horizontal direction are different. However, even if the amounts of leaking are the same, the R signal, the G signal, and the B signal In a white subject where all three primary colors exist, there is no level difference between the G signal of the RG line and the G signal of the BG line. For example, a G signal / B signal for a cyan subject and an R signal for a yellow subject・ Only G signal exists Then, a level difference occurs between the G signal on the RG line and the G signal on the BG line.When the G signal is saturated, even if there is leakage of an adjacent pixel signal, the saturation level cannot exceed the saturation level. No level difference occurs in the G signal of the BG line). In the correction processing unit 103 according to the first embodiment, for example, the register setting value of the leakage ratio is 8-bit data and the horizontal adjacent pixel signal of the correction target pixel is After multiplying the average value and the register setting value of the leakage ratio by the multiplication circuit, if the bit shift down is 1/256, the leak ratio register setting value on the G signal side of the RG line R signal is set to 8 (8/8 / 256 = 1/32). When the leakage ratio register setting value on the G signal side of the BG line B signal is 4 (4/256), the RG line G signal is The 1/32 signal component of the adjacent RG line R signal is obtained by subtracting the 1/64 signal component of the horizontally adjacent BG line B signal of the BG line G signal from the BG line G signal. FIG. 7 shows the results.
[0041]
As can be seen from FIG. 7, when the G signal is not saturated, the level difference between the G signal on the RG line and the G signal on the BG line is eliminated by the above-described leak signal component subtraction processing on the G signal side. When the signal is saturated, the above-mentioned leakage signal component subtraction processing on the G signal side has an adverse effect, and a level difference between the G signal of the RG line and the G signal of the BG line, which is not in the G signal saturated portion, occurs.
[0042]
Therefore, in the pixel signal color mixture reduction apparatus of the first embodiment, the saturation / unsaturation determination circuit 104a in the processing stop command unit 104 shown in FIG. 1 determines whether the G signal is saturated, and determines whether the G signal is saturated. Is to select and output a pixel signal that has not been subjected to the leakage signal component subtraction processing, and the leakage signal component subtraction processing is limited to the case where the G signal is not saturated.
[0043]
As a result, when the G signal is not saturated as shown in FIG. 8, the level difference between the G signal on the RG line and the G signal on the BG line due to the horizontal leakage signal component of the adjacent pixel signal is reduced, and the G signal is reduced. No adverse effect of the leak signal component subtraction process occurs in the saturated portion.
[0044]
(Embodiment 2)
FIG. 9 shows a pixel signal color mixture reduction device according to Embodiment 2 of the present invention.
Reference numerals 101 and 102 denote D flip-flops, which generate pixel signals S1 and S2 delayed by one pixel with respect to the original pixel signal S0 (pixel signal without delay).
[0045]
The correction processing unit 303 receives the original pixel signal S0 and the pixel signal S2 delayed by two pixels by the D flip-flops 101 and 102 as input signals and outputs a pixel to be corrected (a pixel signal delayed by one pixel in this configuration diagram). An average value of pixel signals adjacent in the horizontal direction is calculated. An average value calculation circuit 303a and first correction processing means for subtracting a fixed percentage of signal components calculated from pixel signals other than the specific color and adjacent to the specific color pixel signal in the horizontal direction by using the output of the average value calculation circuit 303a as an input. And secondly subtracting, from the pixel signal other than the specific color, a fixed percentage of the signal component calculated from the pixel signal other than the specific color and the specific color pixel signal horizontally adjacent to the pixel signal other than the specific color by using the output of the average value calculation circuit 303a as an input. Correction processing means.
[0046]
Specifically, the first correction processing means includes a first signal switching circuit 303b, a first leakage signal component calculation circuit 303c, and a subtraction processing circuit 303g.
[0047]
The first signal switching circuit 303b uses the RG line / BG line discrimination signal CO1 as a switching signal and sets the leakage ratio setting value N1 of the RG line R signal on the RG line G signal side and the BG line G signal side of the BG line B signal. Of the leak rate setting value N2 of the first embodiment.
[0048]
The second correction processing means includes a second signal switching circuit 303d, a second leak signal component calculation circuit 303e, and the subtraction processing circuit 303g.
The second signal switching circuit 303d uses the RG line / BG line discrimination signal CO1 as a switching signal, and sets the leakage ratio setting value N3 of the RG line G signal on the RG line R signal side to the BG line B signal side of the BG line G signal. Of the leakage ratio setting value N4 of the first embodiment.
[0049]
The first leak signal component calculation circuit 303c calculates the average value of the pixel signals adjacent to the correction target pixel in the horizontal direction calculated by the average value calculation circuit 303a and the leak ratio setting value on the G signal side output from the switching circuit 303b. Calculate the leak signal component from
[0050]
The second leakage signal component calculation circuit 303e calculates the average value of the pixel signals adjacent in the horizontal direction of the correction target pixel calculated by the average value calculation circuit 303a and the R signal or B signal output from the second signal switching circuit 303d. The leak signal component is calculated from the leak ratio setting value on the signal side. For example, when the register setting value of the leakage ratio is 8-bit data, the average value of the pixel signals adjacent in the horizontal direction of the correction target pixel and the register setting value of the leakage ratio are multiplied by a multiplication circuit, and then the bit shift down is 1/256. Constitution.
[0051]
In the exclusive OR circuit 304a, whether the G signal is an odd-numbered pixel signal or an even-numbered pixel signal changes depending on whether the G signal is an RG line or a BG line. The exclusive OR of the BG line discrimination signal CO1 is taken, and when the pixel signal delayed by one pixel on both the RG line and the BG line is the G signal, the signal is “L”, and the pixel signal delayed by one pixel is the R signal on the RG line or In the case of the B signal of the BG line, it outputs “H”, that is, a G signal discrimination signal.
[0052]
In the third signal switching circuit 303f, the output signal (G signal discrimination signal) of the exclusive OR circuit 304a is used as a switching signal, and the switching signal of the first leaked signal component calculating circuit 303c or the second leaked signal component calculating circuit 303e is used. Switches the output.
[0053]
The subtraction processing circuit 303g outputs the G signal side leakage due to the G signal adjacent R signal or the B signal of the circuit output of the third signal switching circuit 303f from the correction target pixel signal (the pixel signal S1 delayed by one pixel in this configuration diagram). A subtraction process is performed on the R signal or B signal side leakage signal component due to the R signal or the B signal adjacent G signal.
[0054]
Accordingly, the correction processing unit 303 subtracts a leak signal component to a horizontally adjacent pixel signal calculated inside the block of the 303 from the pixel signal (correction target pixel signal) delayed by one pixel.
[0055]
When the pixel signal S1 delayed by one pixel is saturated, the signal "H" is set in the saturation / non-saturation discriminating circuit 305 as a processing stop instruction means for instructing the first and second correction processing means to stop the correction processing. When the pixel signal delayed by one pixel is not saturated, “L” is output.
[0056]
In the fourth signal switching circuit 306, when the phase of the switching signal generated by the saturation / unsaturation determination circuit 305 is “H”, the pixel signal delayed by one pixel is added to the switching signal generated by the saturation / unsaturation determination circuit 305. When the phase is “L”, the leakage signal component subtraction processing block 303 switches the pixel signal delayed by one pixel to a corrected pixel signal obtained by subtracting and correcting the leakage signal component.
[0057]
Accordingly, in the case of the R signal, the G signal, and the B signal at the time of saturation, the pixel signal delayed by one pixel (the leak signal component subtraction processing is not performed), and in the case of the R signal, the G signal, and the B signal at the time of non-saturation, A pixel signal obtained by subtracting and correcting the leak signal component is output.
[0058]
With such a configuration, the level difference between the G signal on the RG line and the G signal on the BG line and the leakage of the G signal component of the R and B signals due to the horizontal leakage signal component of the adjacent pixel signal are reduced, In addition, no adverse effect of the leakage signal component subtraction process occurs in the R signal, G signal, and B signal saturated portions.
[0059]
In FIG. 9, the output of the first leak signal component calculating circuit 303c and the output of the second leak signal component calculating circuit 303e are switched by the third signal switching circuit 303f to the subtraction processing circuit 303g. Since the correction signal to be selectively subtracted is supplied, the fourth signal switching circuit 306 is switched by the single saturation / unsaturation determination circuit 305 to instruct the stop of the signal leakage reduction correction processing. The first processing stop instruction for instructing the stop of the signal leakage reduction correction processing for the specific color pixel signal when the specific color pixel (G) signal reaches the saturation level at the output of the leakage signal component calculation circuit 303c Means is provided, and when the pixel (R, B) signal other than the specific color reaches the saturation level, the pixel signal other than the specific color is output to the output of the second leak signal component calculation circuit 303e. It may be constructed by providing a second processing stop instruction means for instructing the stopping of the adjacent pixel signal leakage included reduction correction process.
[0060]
(Embodiment 3)
FIGS. 10, 11A and 11B show (Embodiment 3) of the present invention.
FIG. 10 shows a pixel signal color mixture reduction device according to Embodiment 3 of the present invention.
[0061]
This configuration diagram is a diagram in the case where the driving clock cycle is the same as one pixel rate.
The configuration of the correction processing unit 504 itself is the same as that of the correction processing unit 103 of the first embodiment, and includes an average value calculation circuit 504a, a first signal switching circuit 504b, a leakage signal component calculation circuit 504c, The subtraction processing circuit 504d is the same as the average value calculation circuit 103a, the first signal switching circuit 103b, the leak signal component calculation circuit 103c, and the subtraction processing circuit 103d, respectively.
[0062]
Reference numerals 501, 502, and 503 denote D flip-flops, each of which delays a pixel signal line to be corrected, a pixel signal line adjacent above the pixel signal line to be corrected, and a pixel signal line adjacent below the pixel signal line to be corrected by one pixel. The three lines of pixel signals thus generated are generated.
[0063]
Here, the outputs of the D flip-flops 502 and 503 are supplied to the input of the average value calculation circuit 504a, and the output of the D flip-flop 501 is supplied to the input of the subtraction processing circuit 504d.
[0064]
The average value calculation circuit 504a delays a pixel signal generated by delaying a pixel signal line adjacent above the correction target pixel signal line by one pixel and a pixel signal line adjacent below the correction target pixel signal line by one pixel. The pixel signal generated by this is input and the average value of the pixel signals adjacent in the vertical direction to the correction target pixel (in this configuration diagram, the pixel signal generated by delaying the correction target pixel signal line signal by one pixel) is calculated. .
[0065]
The first signal switching circuit 504b uses the RG line / BG line discrimination signal CO1 as a switching signal and sets the leakage ratio setting value N5 of the BG line B signal on the RG line G signal side and the BG line G signal side of the RG line R signal. Is switched to the leakage ratio setting value N6.
[0066]
FIG. 11A shows a pixel G to be corrected when the pixel signal line to be corrected is an RG line. FIG. 11B shows a pixel G to be corrected when the pixel signal line to be corrected is a BG line.
[0067]
The leak signal component calculation circuit 504c sets the average value of the pixel signals adjacent to the correction target pixel in the vertical direction calculated by the average value calculation circuit 504a and the leak ratio of the G signal output from the first switching circuit 504b. Calculate the leak signal component from the value (for example, when the register setting value of the leak rate is 8-bit data, multiply the average value of the pixel signal adjacent in the horizontal direction of the correction target pixel and the register setting value of the leak rate by a multiplication circuit) After that, a configuration of 1/256 by bit shift down).
[0068]
In the subtraction processing circuit 504d, the leakage on the G signal side calculated by the leakage signal component calculation circuit 504c from the correction target pixel signal (in this configuration diagram, a pixel signal generated by delaying the correction target pixel signal line signal by one pixel) Subtract signal components.
[0069]
Accordingly, the correction processing unit 504 converts a pixel signal (correction target pixel signal) generated by delaying the correction target pixel signal line signal by one pixel to a vertically adjacent pixel signal calculated inside the block 504. The subtracted signal component is subtracted.
[0070]
The processing stop instruction means 505 is the same as the processing stop instruction means 104 of the first embodiment, and the saturated / unsaturated determination circuit 505a and the OR circuit 505b are respectively a saturated / unsaturated determination circuit 104a and a logical OR circuit 104b. Is the same as The input of the OR circuit 505b receives the output of the saturation / non-saturation determination circuit 505a and the output of the exclusive OR circuit 506b. The output of the drive clock divided-by-2 signal generation circuit 506a and the line discrimination signal CO1 are input to the input of the exclusive OR circuit 506b.
[0071]
More specifically, whether the G signal becomes an odd-numbered pixel signal or an even-numbered pixel signal changes depending on whether it is an RG line or a BG line. Therefore, the exclusive OR of the drive clock divided by 2 signal and the RG line / BG line discrimination signal is obtained. The exclusive-OR circuit 506b calculates “L” when the pixel signal generated by delaying the correction target pixel signal line signal by one pixel for both the RG line and the BG line is a G signal, and sets the correction target pixel signal line to “L”. If the pixel signal generated by delaying the signal by one pixel is the R signal on the RG line or the B signal on the BG line, it outputs 'H', that is, a G signal discrimination signal.
[0072]
In the saturation / unsaturation determination circuit 505a, when the pixel signal generated by delaying the pixel signal line signal to be corrected by one pixel is saturated, the pixel signal delayed by 'H' by one pixel is not saturated. 'L' is output.
[0073]
In the OR circuit 505b, when the correction target pixel (pixel signal generated by delaying the correction target pixel signal line signal by one pixel) is the R signal of the RG line or the B signal of the BG line, or both the RG line and the BG line When the signal is saturated, “H” is set, and for the other correction target pixels (pixel signals generated by delaying the correction target pixel signal line signal by one pixel), both the RG line and the BG line are G signals (when the G signal is not saturated). In the case of, the logical sum of the G signal discrimination signal and the output of the saturation / non-saturation discrimination circuit 505a is calculated so as to output "L".
[0074]
Accordingly, in the processing stop command unit 505, the correction target pixel (a pixel signal generated by delaying the correction target pixel signal line signal by one pixel) in the block where the second switching signal 507 is generated is the R signal of the RG line or the BG line. In the case of the B signal, or when the G signal is saturated in both the RG line and the BG line, “H” is set, and the other correction target pixel (pixel signal generated by delaying the correction target pixel signal line signal by one pixel) pixel signal Outputs “L” when both the RG line and the BG line are G signals.
[0075]
When the phase of the switching signal generated by the processing stop command means 505 is “H”, the second switching signal 507 is transmitted to the pixel to be corrected (a pixel signal generated by delaying the pixel signal line signal to be corrected by one pixel). When the phase of the switching signal generated by the processing stop command means 505 is "L", leakage occurs from the correction target pixel of the correction processing means 504 (a pixel signal generated by delaying the correction target pixel signal line signal by one pixel). The output is switched to a corrected pixel signal obtained by subtracting and correcting the signal component.
[0076]
Accordingly, the correction target pixel (a pixel signal generated by delaying the correction target pixel signal line signal by one pixel) is leaked in the case of the R signal / B signal and the G signal in the saturation state, and leaked in the case of the G signal in the non-saturation state. A pixel signal obtained by subtracting and correcting the embedded signal component is output.
[0077]
According to this configuration, when the G signal is not saturated, the level difference between the G signal of the RG line and the G signal of the BG line due to the vertical leakage signal component of the adjacent pixel signal is reduced, and the G signal is saturated. The adverse effect of the leak signal component subtraction processing does not occur.
[0078]
(Embodiment 4)
FIG. 12 shows (Embodiment 4) of the present invention. FIGS. 11A and 11B are explanatory diagrams of the correction target pixel when the correction target pixel signal line is the RG line and the BG line.
[0079]
FIG. 12 shows a pixel signal color mixture reduction device according to (Embodiment 4) of the present invention.
This configuration diagram is a diagram in the case where the driving clock cycle is the same as one pixel rate.
[0080]
The configuration of the correction processing unit 704 itself is the same as that of the correction processing unit 303 of the second embodiment, and the average value calculation circuit 704a, the first signal switching circuit 704b, and the first leakage signal component calculation The circuit 704c, the second signal switching circuit 704d, the second leakage signal component calculation circuit 704e, the third signal switching circuit 704f, and the subtraction processing circuit 704g are an average value calculation circuit 303a and a first signal switching circuit 303b, respectively. , A first leak signal component calculating circuit 303c, a second signal switching circuit 303d, a second leak signal component calculating circuit 303e, a third signal switching circuit 703f, and a subtraction processing circuit 703g.
[0081]
Reference numerals 501, 502, and 503 denote D flip-flops, each of which delays a pixel signal line to be corrected, a pixel signal line adjacent above the pixel signal line to be corrected, and a pixel signal line adjacent below the pixel signal line to be corrected by one pixel. The three lines of pixel signals thus generated are generated.
[0082]
In the average value calculation circuit 704a of the correction processing means 704, a pixel signal generated by delaying a pixel signal line adjacent above the pixel signal line to be corrected by one pixel and a pixel signal line adjacent below the pixel signal line to be corrected Is input by inputting a pixel signal generated by delaying the pixel signal by one pixel, and a pixel signal vertically adjacent to the pixel to be corrected (a pixel signal generated by delaying the correction target pixel signal line signal by one pixel in this configuration diagram) is input. Calculate the average value.
[0083]
The first signal switching circuit 704b uses the RG line / BG line discrimination signal CO1 as a switching signal, and sets the leakage ratio setting value N5 of the BG line B signal on the RG line G signal side and the BG line G signal of the RG line R signal. Is switched to the leakage ratio setting value N6 on the side.
[0084]
The first leakage signal component calculation circuit 704c calculates the average value of the pixel signals adjacent in the vertical direction of the correction target pixel calculated by the average value calculation circuit 704a and the leakage of the G signal output from the first signal switching circuit 704b. A leak signal component is calculated from the set value of the leak ratio. For example, when the register setting value of the leakage ratio is 8-bit data, the average value of the pixel signals adjacent in the horizontal direction of the correction target pixel and the register setting value of the leakage ratio are multiplied by a multiplication circuit, and then the bit shift down is 1/256. Constitution.
[0085]
The second signal switching circuit 704d uses the RG line / BG line discrimination signal CO1 as a switching signal and sets a leakage ratio setting value N7 on the RG line R signal side of the BG line G signal and a BG line B signal of the RG line G signal. Is switched to the leakage ratio setting value N8 on the side.
[0086]
The second leakage signal component calculation circuit 704e calculates the average value of the pixel signals adjacent to the correction target pixel in the vertical direction calculated by the average value calculation circuit 704a and the R signal side or B signal output from the second signal switching circuit 704d. The leak signal component is calculated from the leak ratio setting value on the signal side. For example, when the register setting value of the leakage ratio is 8-bit data, the average value of the pixel signals adjacent to the correction target pixel in the vertical direction and the register setting value of the leakage ratio are multiplied by a multiplication circuit, and the bit shift down is 1/256. Constitution.
[0087]
The exclusive OR circuit 705a determines whether the G signal is an odd-numbered pixel signal or an even-numbered pixel signal depending on whether the G signal is an RG line or a BG line. The exclusive OR of the line / BG line discrimination signal CO1 is taken, and when the pixel signal delayed by one pixel is a G signal for both the RG line and the BG line, the signal is “L”, and the pixel signal delayed by one pixel is the RG line. In the case of the R signal or the B signal of the BG line, it outputs 'H', that is, a G signal discrimination signal.
[0088]
The third signal switching circuit 704f uses the output signal (G signal discrimination signal) of the exclusive OR circuit 705a as a switching signal and sets the leakage ratio setting value of the RG line R signal on the BG line G signal side / the BG line B signal. RG line G signal side leakage ratio setting value (704b output R signal component or B signal component G side leakage ratio setting value) and BG line G signal RG line R signal side leakage ratio setting value Switching of the leak rate setting value of the RG line G signal on the BG line B signal side (the leak rate setting value of the G signal component of the 704d output on the R signal side or the B signal side) (that is, the leak rate setting on the G side) The value and the set value of the leakage ratio on the R signal side or the B signal side are switched by the G signal discrimination signal).
[0089]
In the subtraction processing circuit 704g, the G signal output from the third signal switching circuit 704f is vertically adjacent to the correction target pixel signal (in this configuration diagram, a pixel signal generated by delaying the correction target pixel signal line signal by one pixel). A leak signal component on the G signal side due to the R signal or the B signal or a leak signal component on the R signal or the B signal side due to a vertically adjacent G signal of the R signal or the B signal is subtracted.
[0090]
Accordingly, the correction processing unit 704 converts the pixel signal line signal to be corrected (pixel signal to be corrected) generated by delaying the pixel signal line signal by one pixel from a pixel signal that is calculated in the correction processing unit 704 to a vertically adjacent pixel signal. Is subtracted.
[0091]
The saturation / non-saturation determination circuit 706 outputs “H” when the pixel signal generated by delaying the correction target pixel signal line signal by one pixel is saturated, and delays the correction target pixel signal line signal by one pixel. When the pixel signal thus generated is not saturated, “L” is output.
[0092]
The fourth signal switching circuit 707 uses the output signal of the saturation / non-saturation determination circuit 706 as a switching signal, and generates a pixel generated by delaying the correction target pixel signal line signal by one pixel when the phase of the switching signal is “H”. A signal is output as an output pixel signal. When the phase of the switching signal is “L”, the output signal of the subtraction processing circuit 704g is output as an output pixel signal.
[0093]
As a result, in the case of the R signal, G signal, and B signal at the time of saturation, the pixel signal generated by delaying the pixel signal line signal to be corrected by one pixel (no subtraction processing of the leakage signal component) is performed. In the case of the R signal / B signal / G signal, a pixel signal obtained by subtracting and correcting the leak signal component is output.
[0094]
With this configuration, the level difference between the G signal on the RG line and the G signal on the BG line and the leakage of the G signal component of the R signal and B signal due to the vertical leakage signal component of the adjacent pixel signal are reduced, and the R signal and G signal are reduced. In the signal / B signal saturated portion, the adverse effect of the leak signal component subtraction processing does not occur.
[0095]
In FIG. 12, the output of the first leakage signal component calculation circuit 704c and the output of the second leakage signal component calculation circuit 704e are switched by the third signal switching circuit 704f to the subtraction processing circuit 704g. Since the correction signal to be selectively subtracted was supplied, the fourth signal switching circuit 707 was switched by the single saturation / unsaturation determination circuit 706 to instruct the stop of the signal leakage reduction correction processing. The first process instructs the output of the leak signal component calculation circuit 704c to stop the signal leak reduction correction process for the specific color pixel signal when, for example, the (G) signal of the specific color pixel reaches the saturation level. A stop command unit is provided, and when the (R, B) signal of a pixel other than the specific color reaches the saturation level, the output of the second leak signal component calculation circuit 704e is provided. It may be constructed by providing a second processing stop instruction means for instructing the stopping of the adjacent pixel signal leakage included reduction correction processing on the pixel signal.
[0096]
(Embodiment 5)
FIG. 13 shows (Embodiment 5) of the present invention. FIGS. 11A and 11B are explanatory diagrams of the correction target pixel when the correction target pixel signal line is the RG line and the BG line.
[0097]
FIG. 10 shows a pixel signal color mixture reduction device according to (Embodiment 5) of the present invention.
This configuration diagram is a diagram in the case where the driving clock cycle is the same as one pixel rate.
[0098]
Reference numerals 101, 502, 503, and 104 denote D flip-flops, each of which is a pixel signal line to be corrected, a pixel signal line adjacent above the pixel signal line to be corrected, and a pixel signal line adjacent below the pixel signal line to be corrected. A pixel signal of three lines delayed by a pixel and a signal delayed by two pixels of the correction target pixel signal line and the correction target pixel signal line are generated.
[0099]
The first correction processing unit 905 has the same configuration as the correction processing unit 103 in FIG. 1, and performs the first correction from a pixel signal (correction target pixel signal) generated by delaying the correction target line signal by one pixel. The leak signal component to the horizontally adjacent pixel signal calculated inside the processing unit 905 is subtracted.
[0100]
The second correction processing unit 906 has the same configuration as the correction processing unit 504 in FIG. 10, and is further calculated inside the block 906 from the pixel signal (correction target pixel signal) processed by the first correction processing unit 905. A leak signal component to a pixel signal adjacent in the vertical direction is subtracted.
[0101]
The signal switching circuit 908 has the same configuration as the signal switching circuit 106 in FIG. 1, and the processing stop instruction means 907 for generating a switching signal has the same configuration as the processing stop instruction means 104 in FIG. The portion composed of the driving clock divided signal generating circuit 105a and the exclusive OR circuit 105b has the same configuration as that of FIG.
[0102]
Accordingly, the processing stop command unit 907 determines whether the pixel signal (correction target pixel signal) generated by delaying the correction target line signal by one pixel is the R signal of the RG line or the B signal of the BG line, or the RG line / BG When the G signal is saturated in both lines, the signal is set to “H”. When the pixel signal (correction target pixel signal) generated by delaying the other correction target line signals by one pixel is the G signal for both the RG line and the BG line, “H” is set. L ′ is output. The signal switching circuit 908 outputs a pixel signal (correction target pixel signal) generated by delaying the correction target line signal by one pixel when the phase of the switching signal generated by the processing stop instruction means 907 is “H”, When the phase of the switching signal generated by the processing stop instruction means 907 is “L”, the signal is switched to the corrected pixel signal output from the second correction processing means 906 and output.
[0103]
As a result, a pixel signal (correction target pixel signal) generated by delaying the correction target line signal by one pixel in the case of the R signal / B signal and the G signal at the time of saturation is output to the output of the signal switching circuit 908. In the case of the G signal at the time of non-saturation, a pixel signal obtained by subtracting and correcting the leak signal component is output.
[0104]
With this configuration, the level difference between the G signal of the RG line and the G signal of the BG line due to the horizontal and vertical leakage signal components of the adjacent pixel signal is reduced, and the leakage signal component subtraction process is performed on the G signal saturated portion. No harm will occur.
[0105]
(Embodiment 6)
FIG. 14 shows (Embodiment 6) of the present invention. FIGS. 11A and 11B are explanatory diagrams of the correction target pixel when the correction target pixel signal line is the RG line and the BG line.
[0106]
FIG. 14 shows a pixel signal color mixture reduction device according to (Embodiment 6) of the present invention.
This configuration diagram is a diagram in the case where the driving clock cycle is the same as one pixel rate.
[0107]
Reference numerals 101, 102, 502, and 503 denote D flip-flops, and the D flip-flops 101, 502, and 503 denote correction target pixel signal lines, pixel signal lines adjacent above the correction target pixel signal line, and below the correction target pixel signal line. Are generated, three pixel signals are generated by delaying the pixel signal lines adjacent to. The D flip-flop 102 generates a correction target pixel signal line and a signal delayed by two pixels of the correction target pixel signal line.
[0108]
The first correction processing unit 1105 has the same configuration as the correction processing unit 303 in FIG. 9, and calculates a fourteenth correction from a pixel signal (correction target pixel signal) generated by delaying the correction target line signal by one pixel. The leakage signal component to the horizontally adjacent pixel signal calculated inside the processing unit 1105 is subtracted.
[0109]
The second correction processing unit 1106 has the same configuration as the correction processing unit 704 in FIG. 12, and further includes a pixel signal (correction target pixel signal) subjected to the horizontal adjacent pixel signal leakage subtraction processing by the first correction processing unit 1105. Then, the leak signal component to the vertically adjacent pixel signal calculated inside the second correction processing unit 1106 is subtracted.
[0110]
The saturation / unsaturation determination circuit 1107 has the same configuration as the saturation / unsaturation determination circuit 706 of FIG. 12, and is “H” when a pixel signal (correction target pixel signal) generated by delaying the correction target line signal by one pixel is saturated. When a pixel signal (correction target pixel signal) generated by delaying the correction target line signal by one pixel (non-saturation) is output, “L” is output.
[0111]
The signal switching circuit 1108 outputs the output signal of the D flip-flop 101 when the phase of the switching signal generated by the saturation / unsaturation determination circuit 1107 is “H”, using the output signal of the saturation / unsaturation determination circuit 1107 as a switching signal. When the phase of the switching signal generated by the saturation / unsaturation determination circuit 1107 is “L”, the first and second correction processing means 1105 and 1106 switch to a corrected pixel signal obtained by subtracting and correcting a leak signal component. I do.
[0112]
Accordingly, a pixel signal (correction target pixel signal) generated by delaying the correction target line signal by one pixel in the case of the R signal / B signal and the G signal at the time of saturation is leaked in the case of the G signal at the time of non-saturation. A pixel signal obtained by subtracting and correcting the embedded signal component is output.
[0113]
With this configuration, the level difference between the G signal of the RG line and the G signal of the BG line due to the horizontal and vertical leakage signal components of the adjacent pixel signal is reduced, and the leakage signal component subtraction process is performed on the pixel signal saturated portion. No harm will occur.
[0114]
In FIG. 14, when the phase of the switching signal generated by the saturation / unsaturation determination circuit 1107 is “H”, the output signal of the D flip-flop 101 is output, and the correction by the first and second correction processing units 1105 and 1106 is performed. Although the processing has been stopped, this can also be configured as shown in FIG.
[0115]
In FIG. 15, it is divided into the following two systems. That is, a first correction processing unit 1105a for performing horizontal correction of a specific color, and a third correction process for performing vertical correction of a specific color using an output signal of the first correction processing unit 1105a as an input. One system is constituted by the unit 1106a and the first signal switching circuit 1108a for selecting and outputting the output of the third correction processing unit 1106a or the output signal of the D flip-flop 101, and the other system is specified. A second correction processing unit 1105b for performing a horizontal correction other than a color, and a fourth correction processing unit for performing a vertical correction other than a specific color by using an output signal of the second correction processing unit 1105b as an input. 1106b and a second signal switching circuit 1108b for selecting and outputting the output of the fourth correction processing means 1106b or the output signal of the D flip-flop 101. To have.
[0116]
The first and second signal switching circuits 1108a and 1108b are switched by the output of the saturation / unsaturation discrimination circuit 1107, and the output of the third correction processing means 1106a via the third signal switching circuit 1108c when the signal is not saturated. The signal or the fourth correction processing means 1106b is output as an output pixel signal.
[0117]
Note that the saturation / unsaturation determination circuits 1107a and 1107b stop the adjacent pixel signal leakage reduction correction processing for the specific color pixel signal when the specific color pixel signal reaches the saturation level, and the pixel signals other than the specific color are saturated. When the level reaches the level, the correction processing of the adjacent pixel signal leakage reduction for the pixel signal other than the specific color is stopped.
[0118]
(Embodiment 7)
16 to 23 show (Embodiment 7) of the present invention.
FIG. 16 shows a pixel signal color mixture reduction apparatus according to (Embodiment 7) of the present invention.
[0119]
This configuration diagram is a diagram in the case where the driving clock cycle is the same as one pixel rate. The pixel unevenness correction will be described for the case of signal lateral leakage.
The D flip-flops 101, 502, and 503 delay the correction target pixel signal line, the pixel signal line adjacent above the correction target pixel signal line, and the pixel signal line adjacent below the correction target pixel signal line by one pixel. Three pixel signal lines are generated.
[0120]
The D flip-flops 102, 1306, and 1307 delay the correction target pixel signal line, the pixel signal line adjacent above the correction target pixel signal line, and the pixel signal line adjacent below the correction target pixel signal line by two pixels, respectively. The three pixel signal lines thus generated are generated.
[0121]
The correction processing unit 1305 subtracts, from the pixel signal (correction target pixel signal) delayed by one pixel, the leakage signal component calculated in the correction processing unit 1305 to a horizontally adjacent pixel signal. The internal processing is the same as that of the correction processing unit 103 in FIG.
[0122]
The D flip-flop 1306 delays the pixel signal line signal adjacent to the correction target line by one pixel, and the diagonally upper right pixel signal of the correction target pixel, and the D flip-flop 1307 is adjacent below the correction target line. Since the pixel signal line signal is delayed by one pixel to generate a pixel signal diagonally lower right of the pixel to be corrected, and the pixel signal to be corrected is delayed by one pixel by the D flip-flop 101, the pixel signal to be corrected is A pixel signal line signal adjacent above the line is an obliquely upper left pixel signal of the correction target pixel, and a pixel signal line signal adjacent below the correction target pixel signal line is an oblique lower left pixel signal of the correction target pixel.
[0123]
The saturation / unsaturation determination circuit 1308 that switches the signal switching circuit 1310 includes first to fifth saturation / unsaturation determination circuits 1308a to 1308e.
The first saturation / unsaturation determination circuit 1308a outputs "H" when the pixel signal at the upper left of the correction target pixel is saturated, and outputs "L" when the pixel signal is unsaturated. The second saturation / unsaturation determination circuit 1308b outputs “H” when the pixel signal at the lower right of the pixel to be corrected is saturated, and outputs “L” when the pixel signal is not saturated. The third saturation / unsaturation determination circuit 1308c outputs “H” when the pixel signal at the lower left of the correction target pixel is saturated, and outputs “L” when the pixel signal is unsaturated. The fourth saturation / unsaturation determination circuit 1308d outputs “H” when the pixel signal at the upper right of the correction target pixel is saturated, and outputs “L” when the pixel signal is not saturated. The fifth saturation / unsaturation determination circuit 1308e outputs “H” when the correction target pixel is saturated, and outputs “L” when the correction target pixel is not saturated.
[0124]
The logical product circuit 1308f detects the logical product of the output of the first saturated / unsaturated determining circuit 1308a and the output of the second saturated / unsaturated determining circuit 1308b.
The logical product circuit 1308g detects the logical product of the output of the third saturation / non-saturation determination circuit 1308c and the output of the fourth saturation / non-saturation determination circuit 1308d.
[0125]
The logical product circuit 1308h detects a logical product of the output of the logical product circuit 1308f and the output of the logical product circuit 1308g.
The logical product circuit 1308i detects a logical product of the output of the logical product circuit 1308h and the output of the fifth saturation / unsaturation determination circuit 1308e. The output of the AND circuit 1308i is a switching signal of the signal switching circuit 1310 via the OR circuit 1309.
[0126]
That is, the saturation / unsaturation determination circuit 1308 calculates the pixel signal at the upper left of the pixel to be corrected, the pixel signal at the lower right of the pixel to be corrected, the pixel signal at the lower left of the pixel to be corrected, and the pixel signal at the lower left of the pixel to be corrected. The saturation / non-saturation determination circuit for the pixel signal to be corrected includes a pixel signal at the upper left of the pixel to be corrected, a pixel signal at the lower right of the pixel to be corrected, a pixel signal at the lower left of the pixel to be corrected, and a lower left pixel of the pixel to be corrected. 'H' is output when the pixel signal and the pixel signal to be corrected are simultaneously saturated, and 'L' is output in other cases.
[0127]
Reference numeral 304b denotes a drive clock divided signal generation circuit 304, and reference numeral 304a denotes an exclusive OR circuit. The drive clock is different because the G signal becomes an odd-numbered pixel signal or an even-numbered pixel signal depending on whether it is an RG line or a BG line. The exclusive OR of the divide-by-2 signal and the RG line / BG line discrimination signal is set to "L" when the correction target pixel signal is a G signal for both the RG line and the BG line, and the correction target pixel signal is set to the R signal of the RG line. Or, when the signal is a B signal on the BG line, it outputs “H”, that is, a G signal discrimination signal, and the OR circuit 1309 outputs a signal when the pixel signal to be corrected is the R signal on the RG line or the B signal on the BG line, or an AND circuit. If the output of 1308i is 'H', the output is 'H'; otherwise, the pixel signal to be corrected is a G signal for both the RG line and the BG line and the output of the AND circuit 1308i. There 'H' when the to output 'L', to detect the logical sum of the G signal discrimination signal.
[0128]
Accordingly, the output of the OR circuit 1309 includes, when the pixel signal to be corrected is the R signal of the RG line or the B signal of the BG line, or when the G signal is saturated in both the RG line and the BG line and the G signal to be corrected ( (Correction target pixel signal) Neighboring upper right, adjacent lower right, lower left, and upper left G signal is also “H” when the G signal is also not saturated or G signal of the correction target pixel signal. Is saturated, and when all of the G signals are not saturated, the output is 'L'.
[0129]
The signal switching circuit 1310 corrects the pixel signal of the correction target line delayed by one pixel when the output phase of the OR circuit 1309 is “H”, and corrects the pixel signal when the output phase of the OR circuit 1309 is “L”. The processing unit 1305 switches the pixel signal delayed by one pixel to a corrected pixel signal obtained by subtracting and correcting the leakage signal component, and outputs an output pixel signal.
[0130]
Thus, when the R signal / B signal or the G signal is saturated and the G signal adjacent diagonally upper right, the adjacent diagonally lower right, the adjacent diagonally lower left, and the adjacent diagonally upper left G signal are saturated, the correction target line pixel signal delayed by one pixel If the G signal is not saturated or the G signal is saturated and the G signal adjacent diagonally upper right, adjacent diagonally lower right, adjacent diagonally lower left, and adjacent diagonally upper left G signal are not saturated, the leakage signal component is subtracted. The corrected pixel signal is output.
[0131]
The operation of the pixel signal color mixture reduction device configured as shown in FIG. 16 will be described with reference to FIGS.
FIG. 20 shows an original ideal image sensor output when an image of a subject as shown in FIG. 18 is picked up by an image sensor having a three primary color filter array (Bayer array) as shown in FIG.
[0132]
18 to 23, the output of the image sensor is shown in the form of 10-bit data in decimal notation.
R signal level = G signal level = B signal level
In this way, it is an ideal signal with color balance.
[0133]
For example, 1/32 signal component of the R signal is on the G signal side adjacent to the horizontal direction, and 1/16 signal component of the G signal is on the R signal side or the B signal side adjacent to the horizontal direction. FIG. 21 shows signal data when the / 64 signal component leaks into the G signal side adjacent in the horizontal direction.
[0134]
Particularly problematic is the level difference between the G signal on the RG line and the G signal on the BG line when the G signal is not saturated (when the G signal is saturated, saturation occurs even if adjacent pixel signals leak. A level difference between the G signal of the RG line and the G signal of the BG line, which is unlikely to be higher than the level, does not occur.) The leak signal component subtraction processing block (FIG. 16) of the pixel signal color mixing reduction apparatus of the seventh embodiment. In 1305), for example, when the register setting value of the leakage ratio is 8-bit data, the multiplication circuit multiplies the average value of the horizontal adjacent pixel signal of the correction target pixel by the register setting value of the leakage ratio, and then performs bit shift down. In the case of the configuration of 1/256, the leakage ratio register value of the G signal side of the RG line R signal is set to 8 (8/256 = 1/32) · the leakage of the G signal side of the BG line B signal. When the ratio register setting value is 4 (4/256), the signal component of 1/32 of the R signal adjacent to the RG line G signal in the horizontal direction from the RG line G signal is converted from the BG line G signal to the horizontal component of the BG line G signal. This means that 1/64 signal component of the B signal adjacent in the direction is subtracted, and the processing result is shown in FIG. When the G signal is not saturated, the level difference between the G signal on the RG line and the G signal on the BG line is eliminated, but when the G signal is saturated, the leakage signal component subtraction processing on the G signal side is performed. An adverse effect appears, and a step occurs between the G signal of the RG line and the G signal of the BG line, which are not in the G signal saturated portion.
[0135]
Also, as shown in FIGS. 18 to 23, when only the G signal of the RG line is saturated out of the G signal of the RG line and the G signal of the BG line (the leakage amount of the R signal component on the adjacent G signal side is B In the case where the signal component is larger than the leakage amount on the adjacent G signal side), in the pixel signal color mixture reduction device having the configuration described in the first to sixth embodiments, signal leakage occurs when the G signal is saturated. Since the correction is not performed, the G signal of the RG line is not corrected, and the signal leakage correction is performed only for the G signal of the BG line. Therefore, the step between the G signal of the RG line and the G signal of the BG line is rather changed. Occurs.
[0136]
Therefore, in the pixel signal color mixture reduction apparatus of the seventh embodiment, when the correction target G signal is saturated, the correction target G signal is diagonally upper right, diagonally lower right, and diagonally lower by the saturation / unsaturation determination circuit 1308. It is determined whether the upper left and the lower left are saturated, and when the G signal to be corrected is saturated, the upper right, lower right, upper left, and lower left of the correction target G signal are saturated (the G signal of the RG line is also saturated). When the BG line G signal is also saturated, the signal switching circuit 1310 is switched to select and output a pixel signal that has not been subjected to the leakage signal component subtraction processing, and the correction target G signal is not saturated. Alternatively, even if the correction target G signal is saturated, if the diagonally upper right, diagonally lower right, diagonally upper left, or diagonally lower left of the correction target G signal is not saturated, the pixel signal subjected to the leakage signal component subtraction processing is used. Select to be output.
[0137]
As a result, when the G signal is not saturated as shown in FIG. 23, the level difference between the G signal on the RG line and the G signal on the BG line due to the leak signal component of the adjacent pixel signal is reduced, and the G signal is saturated. (When both the G signal of the RG line and the G signal of the BG line are saturated) or when only the G signal of the RG line is saturated out of the G signal of the RG line and the G signal of the BG line, the leakage signal component subtraction is performed. No adverse effects of processing occur.
[0138]
In this (Embodiment 7), the saturation / unsaturation discriminating circuit 1308 is implemented in (Embodiment 1), and the level of the specific color pixel signal to be corrected is saturated, and the diagonal right and diagonal right of the specific color pixel signal to be corrected are set. When the level of the specific color pixel signal to be corrected adjacent to the lower, diagonally upper left, and diagonally lower left pixels is saturated, an example in which the adjacent pixel signal leakage correction processing for the specific color pixel signal to be corrected is stopped has been described. Also in the second to sixth embodiments, the provision of the saturation / non-saturation determination circuit 1308 can be expected to improve the image quality unevenness.
[0139]
(Embodiment 8)
FIG. 24 shows (Embodiment 8) of the present invention. See FIG. 17 for an explanatory diagram of the correction target pixel when the correction target pixel signal line is the RG line.
[0140]
FIG. 24 shows a pixel signal color mixture reduction apparatus according to (Embodiment 8) of the present invention. The AND circuit 1308h of the saturation / unsaturation discriminating circuit 1308 of (Embodiment 7) is changed to an OR circuit 1508h to saturate non-saturation. The only difference is that a saturation determination circuit 1508 is used.
[0141]
According to this configuration, the level difference between the G signal on the RG line and the G signal on the BG line due to the leak signal component of the adjacent pixel signal is reduced, and the G signal is saturated (G signal on the RG line, G signal on the BG line). When both the G signal of the RG line and the G signal of the BG line are saturated, only the G signal of the RG line is saturated.
[0142]
In this (Embodiment 8), the saturation / non-saturation discrimination circuit 1508 is implemented in (Embodiment 1), and the level of the specific color pixel signal to be corrected is saturated and the upper right and lower left of the specific color pixel signal to be corrected are diagonally lower right and lower left. When the level of the peripheral specific color pixel signal to be corrected adjacent to the target is saturated, or when the level of the specific color pixel signal to be corrected is saturated and the level of the peripheral specific color pixel signal to be corrected adjacent to the lower right and diagonally upper left of the specific color pixel signal to be corrected is saturated. Or, when the level of the specific color pixel signal to be corrected is saturated and the level of the specific color pixel signal adjacent to the correction target adjacent to the upper right, lower right, lower left, upper left, and lower left of the specific color pixel signal to be corrected is saturated, the specific color pixel signal is output. Has been described as an example in which the adjacent pixel signal leakage reduction correction processing is stopped, but in the second to sixth embodiments, the saturation / non-saturation discrimination processing is performed similarly. 1508 can be expected to improve the image quality non-uniformity by providing a.
[0143]
(Embodiment 9)
25 to 31 show (Embodiment 9) of the present invention. See FIG. 17 for an explanatory diagram of the correction target pixel when the correction target pixel signal line is the RG line.
[0144]
FIG. 25 shows a pixel signal color mixture reduction device according to Embodiment 9 of the present invention.
This configuration diagram is a diagram in the case where the driving clock cycle is the same as one pixel rate. The pixel unevenness correction will be described for the case of signal lateral leakage.
[0145]
1701, 1702, 1703, 1706, 1707, 1712, and 1713 are D flip-flops. The D flip-flops 1701, 1706, and 1712 respectively delay the pixel signal line to be corrected, the pixel signal line adjacent above the pixel signal line to be corrected, and the pixel signal line adjacent below the pixel signal line to be corrected by one pixel. Three pixel signal lines are generated.
[0146]
The D flip-flops 1702, 1707, and 1713 respectively delay the pixel signal line to be corrected, the pixel signal line adjacent above the pixel signal line to be corrected, and the pixel signal line adjacent below the pixel signal line to be corrected by two pixels. Three pixel signal lines are generated.
[0147]
The D flip-flop 1703 generates a pixel signal obtained by delaying the pixel signal line signal to be corrected by three pixels.
Reference numerals 1704, 1708, and 1714 denote correction processing means. The internal processing is the same as that of the correction processing means 103 in FIG.
[0148]
The correction processing unit 1704, as a horizontal leakage signal component subtraction processing block, calculates a horizontally adjacent pixel signal calculated inside the correction processing unit 1704 from a pixel signal (correction target line pixel signal) delayed by one pixel. Of the signal component leaking into the circuit.
[0149]
Correction processing means 1708 and 1714 are also horizontal leakage signal component subtraction processing blocks having the same configuration as 1704, and the correction processing means 1708 performs a horizontal leakage signal on a signal of an adjacent pixel signal line above the line signal to be corrected. The component subtraction / correction processing unit 1714 performs a horizontal leakage signal component subtraction process on a signal of a pixel signal line adjacent below the correction target line signal.
[0150]
As can be seen from FIG. 25, the pixel signal input to the correction processing unit 1704 has a larger delay amount by one pixel than the pixel signals input to the correction processing units 1708 and 1714. When the leakage signal component subtraction processing is being performed, the correction processing unit 1708 outputs the horizontal leakage signal of the pixel signal one pixel after the correction target G signal on the pixel signal line adjacent to the correction target G signal. The component subtraction processing, that is, the horizontal leakage signal component subtraction processing of the G signal obliquely upper left of the G signal to be corrected, and similarly, the correction processing unit 1714 determines the horizontal leakage signal component of the G signal diagonally lower left of the G signal to be corrected. Subtraction processing will be performed.
[0151]
Therefore, the signal obtained through the D flip-flops 1710 and 1711 at the output of the correction processing unit 1708 is the result of the horizontal leakage signal component subtraction processing of the G signal at the upper right of the G signal to be corrected. The signals obtained through the D flip-flops 1715 and 1716 at the output of the correction processing unit 1714 are the results of the horizontal leakage signal component subtraction processing of the G signal at the lower right of the G signal to be corrected.
[0152]
Reference numeral 1705 denotes a saturation / non-saturation determination circuit for the correction target pixel (correction target G signal), which outputs “H” when the correction target pixel is saturated and outputs “L” when the correction target pixel is not saturated.
Reference numeral 1717 denotes an average value calculation circuit that calculates an average value of the result of the horizontal leakage signal component subtraction processing of the pixel signals (G signals) at the upper right, lower right, lower left, and lower left of the pixel signal to be corrected.
[0153]
Reference numeral 1718 denotes a magnitude comparison circuit which is a diagonally upper right, diagonally lower right, diagonally upper left, and diagonally lower left pixel signal of the correction target pixel signal (correction target G signal) in the horizontal direction and the correction target pixel signal. Compare the average value of the result of the horizontal leakage signal component subtraction processing of the diagonally upper right, diagonally lower right, diagonally upper left, and diagonally lower left G signals, and subtract the horizontal leakage signal component of the correction target pixel. If the processing result is smaller than the average value of the horizontal leakage signal component subtraction processing result of the pixel signals at the obliquely upper right, obliquely lower right, obliquely upper left, and obliquely lower left of the pixel signal to be corrected, 'H' is set. When the result of the direction leakage signal component subtraction processing is greater than the average value of the result of the horizontal leakage signal component subtraction processing of the pixel signals at the obliquely upper right, lower right, lower left, and lower left of the pixel signal to be corrected, 'L' is set. Output.
[0154]
The logical product circuit 1719 outputs the logical product of the output of the saturation / unsaturation determination circuit 1705 and the output of the magnitude comparison circuit 1718.
The signal switching circuit 1720 using the output of the AND circuit 1719 as a selection signal is used to calculate the result of the horizontal leakage signal component subtraction processing of the correction target pixel and the diagonally upper right, diagonally lower right, diagonally upper left, and diagonally lower left pixels of the correction target pixel signal. The average value of the result of the subtraction processing of the signal in the horizontal direction is switched and output.
[0155]
That is, when the correction target pixel is saturated and the horizontal leakage signal component subtraction processing result of the correction target pixel is obtained, the horizontal leakage signal component subtraction of the diagonally upper right, diagonally lower right, diagonally upper left, and diagonally lower left pixel signals of the correction target pixel signal is performed. When the processing result is smaller than the average value, the selection signal becomes “H”, and the horizontal leakage signal component subtraction processing result average value of the oblique upper right, oblique lower right, oblique upper left, and oblique lower left pixel signals of the pixel signal to be corrected is calculated as Select and output, and when the correction target pixel is not saturated or the correction target pixel is saturated and the horizontal leakage signal component subtraction processing result of the correction target pixel is obtained, the diagonal upper right, diagonally lower right, diagonally upper left, diagonally lower left of the correction target pixel signal is obtained. When the selected signal is larger than the average value of the result of the horizontal leakage signal component subtraction processing of the pixel signal, the selection signal becomes “L”, and the result of the horizontal leakage signal component subtraction processing of the pixel to be corrected is selectively output.
[0156]
Reference numeral 1709 denotes a saturation / non-saturation determination circuit which determines a pixel signal (a diagonally upper left G signal of a G signal to be corrected) obtained by delaying a pixel signal adjacent to a correction target line (a correction target pixel) by one pixel, and determines a saturation state. Outputs a determination result of "H" and "L" when it is not saturated.
[0157]
Further, the output of the saturation / unsaturation determination circuit 1709 is passed through the two-stage D flip-flops 1721 and 1722 to obtain a saturation / unsaturation determination result for the obliquely upper right G signal of the G signal to be corrected.
[0158]
Reference numeral 1723 denotes a saturation / non-saturation determination circuit which determines a pixel signal (a lower left G signal of the correction target G signal) delayed by one pixel of an adjacent pixel signal below the correction target line (correction target pixel), and determines whether the pixel signal is saturated. Outputs a determination result of "H" and "L" when it is not saturated.
[0159]
Further, the output of the saturation / unsaturation determination circuit 1723 is passed through two stages of D flip-flops 1724 and 1725 to obtain a saturation / unsaturation determination result for the diagonally lower right G signal of the G signal to be corrected.
[0160]
The logical product circuit 1726 detects the logical product of the output of the saturation / unsaturation determination circuit 1709 and the output of the D flip-flop 1722.
The logical product circuit 1727 detects the logical product of the output of the saturation / unsaturation determination circuit 1723 and the output of the D flip-flop 1725.
[0161]
The logical product circuit 1728 detects the logical product of the outputs of the logical product circuits 1726 and 1727. In other words, the pixel signals at the oblique upper right, oblique lower right, oblique upper left, and oblique lower left of the pixel to be corrected (the oblique upper right, oblique lower right, oblique upper left, and oblique lower left G signals of the amendment target G signal) are When all are saturated, 'H' is set to the diagonally upper right, diagonally lower right, diagonally upper left, diagonally lower left of the pixel to be corrected when the pixel signal is not saturated or diagonally upper right, diagonally lower right, diagonally upper left, diagonally lower left of the pixel to be corrected. When all are not saturated, 'L' is output.
[0162]
The logical product circuit 1729 detects the logical product of the output of the logical product circuit 1728 and the output of the saturation / unsaturation determination circuit 1705. That is, the output is “H” only when the pixel signals at the obliquely upper right, obliquely lower right, obliquely upper left, and obliquely lower left of the pixel to be corrected are saturated and the pixel to be corrected is saturated. Otherwise, “L” is output.
[0163]
Reference numeral 1730 denotes a G signal discrimination signal generation circuit which outputs "L" for a G signal and "H" for an R signal or a B signal. The internal circuit is constituted in the same manner by the processing stop command means 104 of FIG. 1, the drive clock divided-by-2 signal generation circuit 105a and the exclusive OR circuit 105b.
[0164]
The logical sum circuit 1731 detects the logical sum of the output of the G signal determination signal generation circuit 1730 and the output of the logical product circuit 1729.
The signal switching circuit 1732 using the output of the OR circuit 1731 as a switching signal is a G signal when the R signal / B signal or the G signal is saturated and the G signal is adjacent diagonally upper right, adjacent diagonally lower right, adjacent diagonally lower left, and adjacent diagonally upper left G signal. When the G signal is saturated, a correction target line pixel signal is output which is delayed by one pixel. When the G signal is saturated and the G signal leakage signal component subtraction correction result is obtained, the G signal adjacent upper right, the adjacent lower right, the adjacent lower left, and the upper left When the signal component subtraction correction result of the G signal is larger, the correction target G signal leakage signal component subtraction correction result and the correction target G signal adjacent diagonally upper right, adjacent diagonally lower right, adjacent diagonally lower left, and adjacent diagonally upper left G signal. To correct the signal difference of the component subtraction correction result, the correction target G signal leakage signal component subtraction correction result is corrected to the correction target G signal adjacent diagonally upper right, adjacent diagonally lower right, adjacent diagonally lower left, adjacent diagonal. The signal is subtracted from the signal component subtraction correction result of the upper left G signal, and is output when the G signal is not saturated or the G signal is saturated and the G signal leakage signal component subtraction correction result is obtained. If the signal component subtraction correction result of the lower left diagonal and the adjacent upper left diagonal G signal is smaller, the correction target G signal leakage signal component subtraction correction result is output.
[0165]
The operation of the pixel signal color mixture reduction device configured as shown in FIG. 25 will be described with reference to FIGS.
FIG. 28 shows an original ideal image sensor output when an image of a subject as shown in FIG. 26 is captured by an image sensor having a three primary color filter array (Bayer array) as shown in FIG. 26 to 31, the output of the image sensor is shown in the form of 10-bit data in decimal notation.
R signal level = G signal level = B signal level
In this way, it is an ideal signal with color balance.
[0166]
For example, 1/32 signal component of the R signal is on the G signal side adjacent to the horizontal direction, and 1/16 signal component of the G signal is on the R signal side or the B signal side adjacent to the horizontal direction. FIG. 29 shows signal data when the / 64 signal component leaks into the G signal side adjacent in the horizontal direction.
[0167]
Particularly problematic is the level difference between the G signal on the RG line and the G signal on the BG line when the G signal is not saturated (when the G signal is saturated, saturation occurs even if adjacent pixel signals leak. A level difference between the G signal of the RG line and the G signal of the BG line, which cannot be equal to or higher than the level, does not occur.) The leak signal component subtraction processing block (FIG. 25) of the pixel signal color mixture reduction apparatus of the ninth embodiment. 1704, 1708, and 1714), for example, when the register setting value of the leakage ratio is 8-bit data, the average value of the horizontal adjacent pixel signal of the correction target pixel and the register setting value of the leakage ratio are multiplied by a multiplication circuit. In the case of a configuration of 1/256 with the subsequent bit shift down, the leakage ratio register set value on the G signal side of the RG line R signal is set to 8 (8/256 = 1/32) · BG line B signal. Is set to 4 (4/256), the 1/32 signal component of the R signal adjacent to the RG line G signal in the horizontal direction is converted from the RG line G signal to the BG line G signal. , A 1/64 signal component of the B signal adjacent to the BG line G signal in the horizontal direction is subtracted, and the processing result is shown in FIG. When the G signal is not saturated, the level difference between the G signal on the RG line and the G signal on the BG line is eliminated, but when the G signal is saturated, the leakage signal component subtraction processing on the G signal side is performed. An adverse effect appears, and a step occurs between the G signal of the RG line and the G signal of the BG line, which are not in the G signal saturated portion.
[0168]
26 to 31, when only the G signal of the RG line is saturated out of the G signal of the RG line and the G signal of the BG line (the leakage amount of the R signal component on the adjacent G signal side is B When the signal component is larger than the leakage amount on the adjacent G signal side), in the pixel signal color mixture reduction device having the configuration according to the first to sixth embodiments of the present invention, the signal is reduced when the G signal is saturated. Since the leak correction is not performed, the G signal of the RG line is not corrected, and the signal leak correction is performed only for the G signal of the BG line. Thus, the G signal of the RG line and the G signal of the BG line are rather changed. Step occurs.
[0169]
Therefore, in the pixel signal color mixing reduction apparatus of the ninth embodiment, when the G signal to be corrected is saturated, the AND circuit 1729 in FIG. It is determined whether the upper left and the lower left are saturated, and when the G signal to be corrected is saturated, the upper right, lower right, upper left, and lower left of the correction target G signal are saturated (the G signal of the RG line is also saturated). If the BG line G signal is also saturated, the signal switching circuit 1732 selects and outputs a pixel signal that has not been subjected to the leak signal component subtraction processing. If the correction target G signal is not saturated or the correction target G signal is Even in the case of saturation, if the diagonally upper right, diagonally lower right, diagonally upper left, and diagonally lower left of the G signal to be corrected are not saturated, the pixel signal subjected to the leakage signal component subtraction processing is selectively output at 1732. The configuration is the same as the configuration of the (Embodiment 7).
[0170]
Furthermore, when only the G signal of the RG line is saturated out of the G signal of the RG line and the G signal of the BG line (the leakage amount of the R signal component on the adjacent G signal side is smaller than that of the B signal component on the adjacent G signal side). In order to reduce the adverse effect of the leakage signal component subtraction processing on the G signal side (when the leakage amount is larger than the leakage amount), when the correction target G signal is saturated and the correction target G signal is at the upper left, lower left, lower right, lower right, and lower right When the adjacent G signal is not saturated, the magnitude comparison circuit 1718 of FIG. 25 subtracts the leakage signal component subtraction processing result on the G signal side of the G to be corrected and the diagonally upper left, diagonally lower left, diagonally upper right, and diagonally of the G signal to be corrected. The processing result of the leakage signal component subtraction on the G signal side of the lower right adjacent G signal is compared in magnitude, and if the processing result of the leakage signal component subtraction on the G signal side of the correction target G is large, the G signal of the correction target G is large. Side signal component subtraction The processing result is output. If the processing result of the leakage signal component subtraction on the G signal side of the G signal to be corrected is small, the processing result of the leakage signal component subtraction on the G signal side of the G to be corrected and the diagonally upper left of the G signal to be corrected In order to eliminate the signal level difference of the processing result of the leakage signal component subtraction on the G signal side of the diagonally lower left, diagonally upper right and diagonally lower right adjacent G signals, in the configuration diagram of FIG. The signal is output instead of the result of subtracting the leakage signal component on the G signal side of the G signal on the upper left, lower left, upper right, and lower right sides of the G signal to be corrected.
[0171]
As a result, when the G signal is not saturated as shown in FIG. 31, the level difference between the G signal on the RG line and the G signal on the BG line due to the leak signal component of the adjacent pixel signal is reduced, and the G signal is saturated. In the case (the G signal on the RG line and the G signal on the BG line are both saturated) or when only the G signal on the RG line out of the G signal on the RG line and the G signal on the BG line are saturated, the leakage signal component subtraction processing is performed. No adverse effects occur.
[0172]
In this (Embodiment 9), at 1710, 1711, 1715, 1716, 1717, 1718, 1720, etc., the level of the specific color pixel signal to be corrected is saturated, and the diagonal right and diagonal right of the specific color pixel signal to be corrected are set. Correction processing obtained when the correction target peripheral specific color pixel signal level adjacent to the lower, diagonally upper left, and diagonally lower left is not saturated, and obtained by performing the adjacent pixel signal leakage reduction correction processing on the correction target specific color pixel signal When the signal level of the pixel signal of the specific color to be corrected later is diagonally upper right, diagonally lower right, diagonally upper left, or diagonally lower left of the specific color pixel signal to be corrected, the adjacent pixel signal leakage reduction is reduced for the peripheral specific color pixel signal to be corrected. If the signal level of the peripheral specific color pixel signal to be corrected after the correction processing obtained by the correction processing is lower, the signal level of the pixel signal of the specific color to be corrected is changed. Level adjustment means 1733 to be the same as the positive processed to be corrected around the specific color pixel signal the signal level is configured.
[0173]
Also, at 1705, 1709, 1721, 1722, 1723, 1724, 1725, 1726, 1727, 1728, 1729, 1730, 1731, etc., when the correction target specific color pixel signal level is saturated, and at the diagonally upper right of the correction target specific color pixel signal, When the specific color pixel signal level around the correction target adjacent to the diagonally lower right, diagonally upper left, and diagonally lower left is saturated, the processing stop command means 1734 for commanding to stop the adjacent pixel signal leakage reduction processing for the correction target specific color pixel signal is performed. It is configured.
[0174]
In this (Embodiment 9), the case where the level adjusting means 1733 and the processing stop instruction means 1734 are implemented in (Embodiment 1) has been described as an example, but (Embodiment 2) to (Embodiment 2) In the embodiment 6) as well, by providing the level adjusting means 1733 and the processing stop command means 1734, improvement in image quality unevenness can be expected.
[0175]
(Embodiment 10)
FIG. 32 shows (Embodiment 10) of the present invention. FIG. 17 is an explanatory diagram of the correction target pixels when the correction target pixel signal line is an RG line and a BG line.
[0176]
The configuration diagram of FIG. 32 is a diagram in the case where the drive clock cycle is the same as one pixel rate. The pixel unevenness correction will be described for the case of signal lateral leakage. The same components as those in FIG. 25 are described with the same reference numerals.
[0177]
Reference numeral 1918 denotes an average value calculation circuit that calculates an average value of processing results of horizontal leakage signal component subtraction of a correction target peripheral pixel signal (G signal) adjacent to the lower right and upper left of the correction target pixel signal.
[0178]
Reference numeral 1919 denotes an average value calculation circuit that calculates the average value of the processing results of the horizontal leakage signal component subtraction of the correction target peripheral pixel signals (G signals) adjacent to the upper right and lower left of the correction target pixel signal.
[0179]
Reference numeral 1920 denotes a magnitude comparison circuit, which is a processing result of the horizontal leakage signal component subtraction of the correction target pixel (correction target G signal) and a correction target peripheral pixel signal (correction target peripheral pixel signal) adjacent to the lower right and upper left of the correction target pixel signal. The average values of the horizontal leakage signal component subtraction processing of the lower right and upper left pixels of the G signal are compared, and the processing result of the horizontal leakage signal component subtraction of the pixel to be corrected is the value of the correction target pixel signal. If the result of the horizontal leakage signal component subtraction of the neighboring pixel signals to be corrected adjacent to the diagonally lower right and upper left corners is smaller than the average value of the processing result of the horizontal leakage signal component subtraction, 'H' is set, and the horizontal leakage signal component subtraction processing of the correction target pixel is performed. If the result is larger than the processing result average value of the horizontal leakage signal component subtraction of the correction target peripheral pixel signals adjacent to the obliquely lower right and upper left of the correction target pixel signal, “L” is output.
[0180]
Reference numeral 1921 denotes a magnitude comparison circuit, which is a processing result of a horizontal leakage signal component subtraction of a correction target pixel (correction target G signal) and a correction target peripheral pixel signal (correction target G signal) adjacent to the diagonally upper right and lower left of the correction target pixel signal. The average value of the horizontal leakage signal component subtraction processing of the upper right and lower left signals of the signal is compared, and the processing result of the horizontal leakage signal component subtraction of the correction target pixel is the upper right diagonal of the correction target pixel signal. When the processing result of the horizontal leakage signal component subtraction of the peripheral pixel signal to be corrected adjacent to the lower left is smaller than the average value of the processing result of the horizontal leakage signal component subtraction, the processing result of the horizontal leakage signal component subtraction of the correction target pixel is corrected. If it is larger than the average value of the result of the horizontal leakage signal component subtraction of the peripheral pixel signals to be corrected adjacent to the oblique upper right and lower left of the target pixel signal, “L” is output.
[0181]
In this (Embodiment 10), the average value calculation circuit 1918 and the size comparison circuit 1920 constitute a first level adjustment unit, and the average value calculation circuit 1919 and the size comparison circuit 1921 perform the second level adjustment. Means are configured.
[0182]
In this (Embodiment 10), processing stop command means corresponding to the processing stop command means 1734 in FIG. 25 showing (Embodiment 9) is constituted by 1934, 1935, 1936, 1938, 1730, 1731. ing.
[0183]
Reference numeral 1922 denotes a signal switching circuit that uses the output signal of the magnitude comparison circuit 1920 as a switching signal. When the output signal of the magnitude comparison circuit 1920 is “H”, the output signal of the average value calculation circuit 1918 is selected and output. When the output signal of 1920 is “L”, the output signal of the average value calculation circuit 1919 is selected and output.
[0184]
The logical product circuit 1923 detects a logical product of the output signal of the size comparison circuit 1920 and the output signal of the size comparison circuit 1921. That is, when both the output signal of the magnitude comparison circuit 1920 and the output signal of the magnitude comparison circuit 1921 are “H”, “H” is output; otherwise, “L” is output.
[0185]
When the output signal of the AND circuit 1923 is “H”, the signal switching circuit 1924 using the output signal of the AND circuit 1923 as a switching signal selects and outputs the output signal of the average value calculating circuit 1917 and outputs the average value. When the output signal of the calculation circuit 1923 is “L”, the output signal of the signal switching circuit 1922 is selected and output.
[0186]
The logical sum circuit 1925 detects the logical sum of the output signal of the magnitude comparison circuit 1920 and the output signal of the magnitude comparison circuit 1921. That is, when both the output signal of the magnitude comparison circuit 1920 and the output signal of the magnitude comparison circuit 1921 are “H”, or when one of the output signal of the magnitude comparison circuit 1920 and the output signal of the magnitude comparison circuit 1921 is “H”, Outputs “H” and outputs “L” when both the output signal of the magnitude comparison circuit 1920 and the output signal of the magnitude comparison circuit 1921 are “L”.
[0187]
Here, the logical product circuit 1719 detects the logical product of the output of the logical sum circuit 1925 and the output of the saturation / non-saturation determination circuit 1705 (when both the output signal of 1925 and the output signal of 1905 are “H”, the logical product becomes “H”). ', Otherwise output' L ').
[0188]
When the output signal of the AND circuit 1719 is "H", the magnitude comparison circuit 1920 using the output signal of the AND circuit 1719 as a switching signal selects and outputs the output signal of the signal switching circuit 1924, and outputs the signal. When the output signal of 1719 is “L”, the output signal of the correction processing unit 1704 is selected and output.
[0189]
The logical product circuit 1934 detects the logical product of the output signal of the D flip-flop 1722 and the output signal of the saturation / non-saturation determination circuit 1723 (“H” when both the output signal of 1722 and the output signal of 1723 are “H”). Is output, otherwise, 'L' is output).
[0190]
The AND circuit 1935 detects the logical product of the output signal of the saturation / unsaturation determination circuit 1709 and the output signal of the D flip-flop 1725 (“H” when both the output signal of 1709 and the output signal of 1725 are “H”). Is output, otherwise, 'L' is output).
[0191]
The OR circuit 1936 detects the logical sum of the output signals of the AND circuits 1934 and 1935 (the output signal of 1934 and the output signal of 1935 are both “H” or one of the output signal of 1934 and the output signal of 1935). Is 'H', 'H' is output, and when both the output signal of 1934 and the output signal of 1935 are 'L', 'L' is output).
[0192]
The logical product circuit 1938 detects the logical product of the output signal of the logical sum circuit 1936 and the output signal of the saturation / non-saturation discriminating circuit 1705 (“H” when both the output signal of 1936 and the output signal of 1705 are “H”). Is output, otherwise, 'L' is output).
[0193]
Here, the logical sum circuit 1731 detects the logical sum of the output signal of the logical product circuit 1938 and the output signal of the G signal discrimination signal generation circuit 1730 (both the output signal of 1938 and the output signal of 1730 are “H” or 1938). If one of the output signal and the output signal of 1730 is “H”, “H” is output, and if the output signal of 1938 and the output signal of 1730 are both “L”, “L” is output).
[0194]
Here, the signal switching circuit 1732 selects and outputs the output signal of the D flip-flop 1902 when the output signal of the OR circuit 1731 is “H”, and outputs the signal when the output signal of the OR circuit 1731 is “L”. , And selectively outputs the output signal of the signal switching circuit 1720.
[0195]
According to this configuration, the level difference between the G signal on the RG line and the G signal on the BG line due to the leak signal component of the adjacent pixel signal is reduced, and the G signal is saturated (G signal on the RG line, G signal on the BG line). If both of the G signal of the RG line and the G signal of the BG line are saturated, only the G signal of the RG line or the G signal of the BG line is saturated. No longer occurs.
[0196]
【The invention's effect】
As described above, according to the first, fourth, and seventh aspects of the present invention, a signal component having a fixed ratio calculated from a specific color pixel signal and a pixel signal other than the specific color adjacent to the specific color pixel signal. Is subtracted, and when the correction target image pixel signal reaches the saturation level, the correction process is stopped. For example, when the correction target image pixel signal is a G signal, the correction target image pixel signal is adjacent to the G signal in the horizontal direction. Signal mixing failure due to leakage from the R signal or B signal to the G signal side, and the level difference between the G signal of the RG line and the G signal of the BG line due to the signal mixing, and at the same time, adjacent pixel signal component leakage when the G signal is saturated The adverse effects of the correction processing can be suppressed.
[0197]
According to the second and third, fifth, sixth, eighth, and ninth aspects of the present invention, a signal of a fixed ratio calculated from a specific color pixel signal and a pixel signal other than the specific color adjacent to the specific color pixel signal is used. In addition to subtracting the components, when the specific color pixel signal reaches the saturation level, a command is issued to stop the signal leakage reduction correction processing for the specific color pixel signal. In addition to subtracting a fixed percentage of signal components calculated from the pixel signal of the specific color and the adjacent specific color pixel signal, when the pixel signal of the non-specific color reaches the saturation level, leakage of the adjacent pixel signal to the pixel signal of the non-specific color occurs Stop the reduction correction processing.
[0198]
For example, when a correction target image pixel signal is a G signal, a signal color mixing problem due to leakage of an R signal or a B signal adjacent to the G signal to the G signal side, and a G signal and a BG line of an RG line due to a signal color mixture. A step of a G signal and an adjacent pixel signal at the time of saturation of an R, G, and B signal at the same time as being adjacent to an R signal or a B signal, reducing a signal color mixing problem caused by leakage from the G signal to the R or B signal side. The adverse effect of the component leakage correction processing can be suppressed.
[0199]
According to a tenth aspect of the present invention, there is provided a pixel signal color mixture reduction apparatus according to any one of the first to ninth aspects, wherein the correction target specific color pixel signal level is saturated and the correction target specific color pixel signal is obliquely upper right, lower oblique lower right, When the level of the target specific color pixel signal adjacent to the obliquely upper left and diagonally lower left is saturated, a saturation / non-saturation determination circuit that stops the adjacent pixel signal leakage correction processing for the specific color pixel signal to be corrected is provided. When the target image pixel signal is a G signal, when the signal level of the correction target G signal is not saturated, or when the correction target G signal level is saturated, the signal level of the correction target peripheral G signal adjacent to the correction target G signal is reduced. Adjacent pixel signal component leakage that subtracts a certain percentage of signal components calculated from R or B signals adjacent to the G signal to be corrected from the G signal to be corrected when the signal is not saturated When the correction target G signal level is saturated and the correction target peripheral G signal level adjacent to the correction target G signal is saturated, the adjacent pixel signal component leakage correction processing for the correction target G signal is stopped, so that the adjacent correction is performed. Of the color mixing problem caused by leaking into the pixel signal to be leaked, and at the same time, the adjacent pixel signal component leak correction processing when either one of the G signal of the RG line or the G signal of the BG line is saturated. The adverse effects can be suppressed.
[0200]
The pixel signal color mixture reduction device according to claim 12 and claim 13 of the present invention is characterized in that, in any one of claims 1 to 9, the correction target specific color pixel signal level is saturated and adjacent to the correction target specific color pixel signal. The signal level of the correction target specific color pixel signal obtained by performing the correction process on the adjacent pixel signal leakage reduction for the correction target specific color pixel signal when the correction target peripheral specific color pixel signal level is not saturated. Is lower than the signal level of the pixel signal of the correction target peripheral specific color after the correction processing obtained by performing the adjacent pixel signal leakage reduction correction processing on the correction target peripheral specific color pixel signal adjacent to the pixel signal of the correction target specific color. If the signal level is smaller, a level adjusting means for making the signal level of the correction target specific color pixel signal equal to the signal level of the correction target peripheral specific color pixel signal after the correction processing; When the level of the fixed color pixel signal is saturated and when the level of the peripheral specific color pixel signal to be corrected adjacent to the specific color pixel signal to be corrected is saturated, the processing stop commanding to stop the adjacent pixel signal leakage reduction processing for the specific color pixel signal to be corrected is stopped. Since the command means is provided, for example, when a G pixel is used as a correction target image pixel signal, it is possible to reduce a signal color mixing problem caused by leaking into an adjacent pixel signal, and at the same time, to reduce a G signal of an RG line or a G signal of a BG line. When one of the G signals is saturated, the adverse effect of the adjacent pixel signal component leakage correction processing can be suppressed.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a first embodiment of a pixel signal color mixture reduction device according to the present invention;
FIG. 2 is an explanatory diagram when the device signal line is an RG line and the device signal line is a BG line according to the embodiment;
FIG. 3 is an explanatory diagram of an adjacent pixel signal component leakage correction processing operation according to the embodiment;
FIG. 4 is an explanatory diagram of an adjacent pixel signal component leakage correction processing operation according to the embodiment;
FIG. 5 is an explanatory diagram of an adjacent pixel signal component leakage correction processing operation according to the embodiment;
FIG. 6 is an explanatory diagram of an adjacent pixel signal component leakage correction processing operation according to the embodiment;
FIG. 7 is an explanatory diagram of an adjacent pixel signal component leakage correction processing operation according to the embodiment;
FIG. 8 is an explanatory diagram of an adjacent pixel signal component leakage correction processing operation according to the embodiment;
FIG. 9 is a configuration diagram of a pixel signal color mixture reduction device according to a second embodiment of the present invention;
FIG. 10 is a configuration diagram of a pixel signal color mixture reduction device according to a third embodiment of the present invention;
FIG. 11 is an explanatory diagram of a case where a device signal line is an RG line and a device signal line of a correction is a BG line according to the embodiment;
FIG. 12 is a configuration diagram of a pixel signal color mixture reduction device (Embodiment 4) of the present invention.
FIG. 13 is a configuration diagram of a pixel signal color mixture reduction device (Embodiment 5) of the present invention.
FIG. 14 is a configuration diagram of a pixel signal color mixture reduction device (Embodiment 6) of the present invention.
FIG. 15 is a configuration diagram of another example of the embodiment.
FIG. 16 is a configuration diagram of a pixel signal color mixture reduction device according to a seventh embodiment of the present invention;
FIG. 17 is an explanatory diagram of a case where a device signal line is an RG line according to the embodiment;
FIG. 18 is an explanatory diagram of the adjacent pixel signal component leak correction processing operation of the embodiment.
FIG. 19 is an explanatory diagram of the adjacent pixel signal component leakage correction processing operation of the embodiment.
FIG. 20 is an explanatory diagram of an adjacent pixel signal component leakage correction processing operation according to the embodiment;
FIG. 21 is an explanatory diagram of an adjacent pixel signal component leakage correction processing operation according to the embodiment;
FIG. 22 is an explanatory diagram of an adjacent pixel signal component leakage correction processing operation according to the embodiment;
FIG. 23 is an explanatory diagram of an adjacent pixel signal component leakage correction processing operation according to the embodiment;
FIG. 24 is a configuration diagram of a pixel signal color mixture reduction device (Embodiment 8) of the present invention.
FIG. 25 is a configuration diagram of a ninth embodiment of a pixel signal color mixture reduction device of the present invention.
FIG. 26 is an explanatory diagram of the adjacent pixel signal component leak correction processing operation of the embodiment.
FIG. 27 is an explanatory diagram of the adjacent pixel signal component leak correction processing operation of the embodiment.
FIG. 28 is an explanatory diagram of the adjacent pixel signal component leak correction processing operation of the embodiment.
FIG. 29 is an explanatory diagram of the adjacent pixel signal component leakage correction processing operation of the embodiment.
FIG. 30 is an explanatory diagram of an adjacent pixel signal component leakage correction processing operation according to the embodiment;
FIG. 31 is an explanatory diagram of the adjacent pixel signal component leakage correction processing operation of the embodiment.
FIG. 32 is a configuration diagram of a pixel signal color mixture reduction device (Embodiment 10) of the present invention.
FIG. 33 is an explanatory diagram of a color filter array of an image sensor.
FIG. 34 is an explanatory diagram of a problem due to miniaturization accompanying an increase in the number of pixels of an image sensor.
FIG. 35 is an explanatory diagram of a problem caused by a high-speed drive accompanying an increase in the number of pixels of an image sensor.
FIG. 36 is an explanatory diagram of a problem caused by a high-speed drive accompanying an increase in the number of pixels of an image sensor.
FIG. 37 is an explanatory diagram of a problem caused by a high-speed drive accompanying an increase in the number of pixels of an image sensor.
[Explanation of symbols]
101,102 D flip-flop
103 Correction processing means
104 Correction G Signal / Uncorrected R Signal B Signal Discrimination and Correction Target G Signal Saturation / Unsaturation Discrimination Signal Generation Block
106 signal switching circuit
301, 302 D flip-flop
303 Correction processing means
304 Saturation / unsaturation discrimination circuit of signal level of pixel signal to be corrected
305 Signal switching circuit
501,502 D flip-flop
503 D flip-flop
504 vertical direction correction processing means
505 Processing stop instruction means
506 Signal switching circuit
704 Correction processing means
706 Signal switching circuit
901 and 902 D flip-flop
903,904 D flip-flop
905 Correction processing means
906 Vertical direction correction processing means
907 Processing stop instruction means
908 Signal switching circuit
1105 First correction processing means
1106 Second correction processing means
1107 Saturation / unsaturation discrimination circuit
1108 Signal switching circuit
1305 Correction processing means
1306, 1307 D flip-flop
1308 Saturation / unsaturation determination circuit determination circuit
1309 OR circuit
1310 Signal switching circuit
1508 Saturation / unsaturation discrimination circuit
1510 Signal switching circuit
1701, 1702, 1703 D flip-flop
1704 Correction processing means
1705 Correction target pixel signal saturation / unsaturation determination signal generation block
1706, 1707 D flip-flop
1708 Correction processing means
1709 Saturation / unsaturation discrimination circuit
1710, 1711 D flip-flop
1712, 1713 D flip-flop
1714 Correction processing means
1715, 1716 D flip-flop
1717 Average value calculation circuit
1718 comparison circuit
1719 AND circuit
1720 Signal switching circuit
1721, 1722 D flip-flop
1723 Pixel signal saturation / unsaturation discrimination signal generation block
1724, 1725 D flip-flop
1726,1727 AND circuit
1728, 1729 AND circuit
1730 G signal discrimination signal generation circuit
1731 OR circuit
1732 Signal switching circuit
1928 Pixel signal saturation / unsaturation discrimination signal generation block
1918, 1919 Average value calculation circuit
1920, 1921 Size comparison circuit
1922 Signal switching circuit
1923 AND circuit
1924 Signal switching circuit
1925 OR circuit
1927 Signal switching circuit
1934, 1935 AND circuit
1936 OR circuit
1938 AND circuit

Claims (13)

What is claimed is: 1. A pixel signal color mixing reduction device which has a primary color of R (red), G (green), and B (blue) and executes a color mixing defect suppressing process for a pixel signal in which specific colors are arranged in a checkered pattern. ,
Correction processing means for subtracting, from the specific color pixel signal, a fixed percentage of signal components calculated from pixel signals other than the specific color adjacent to the specific color pixel signal in the horizontal direction;
A pixel signal color mixture reduction device, comprising: processing stop command means for commanding stop of adjacent pixel signal leakage reduction correction processing for a specific color pixel signal when the specific color pixel signal reaches a saturation level. What is claimed is: 1. A pixel signal color mixing reduction device which has a primary color of R (red), G (green), and B (blue) and executes a color mixing defect suppressing process for a pixel signal in which specific colors are arranged in a checkered pattern. ,
First correction processing means for subtracting, from the specific color pixel signal, a fixed percentage of signal components calculated from pixel signals other than the specific color adjacent to the specific color pixel signal in the horizontal direction;
First processing stop instruction means for instructing stop of the signal leakage reduction correction processing for the specific color pixel signal when the specific color pixel signal reaches the saturation level;
Second correction processing means for subtracting, from the pixel signals other than the specific color, a fixed percentage of signal components calculated from the pixel signals other than the specific color and the specific color pixel signals horizontally adjacent thereto,
And a second processing stop command means for stopping the adjacent pixel signal leakage reduction correction processing for the pixel signal other than the specific color when the pixel signal other than the specific color reaches the saturation level. Color mixing reduction device. What is claimed is: 1. A pixel signal color mixing reduction device which has a primary color of R (red), G (green), and B (blue) and executes a color mixing defect suppressing process for a pixel signal in which specific colors are arranged in a checkered pattern. ,
First correction processing means for subtracting, from the specific color pixel signal, a fixed percentage of signal components calculated from pixel signals other than the specific color adjacent to the specific color pixel signal in the horizontal direction;
Second correction processing means for subtracting, from the pixel signals other than the specific color, a fixed percentage of signal components calculated from the pixel signals other than the specific color and the specific color pixel signals horizontally adjacent thereto,
A pixel signal color reduction device, comprising: a process stop command unit that commands a stop of the signal leakage reduction correction process by the first and second correction processing units when the pixel signal reaches a saturation level. What is claimed is: 1. A pixel signal color mixing reduction device which has a primary color of R (red), G (green), and B (blue) and executes a color mixing defect suppressing process for a pixel signal in which specific colors are arranged in a checkered pattern. ,
Correction processing means for subtracting, from the specific color pixel signal, a fixed percentage of signal components calculated from pixel signals other than the specific color vertically adjacent to the specific color pixel signal;
A pixel signal color mixing reduction device, comprising: a process stop instruction unit for stopping the adjacent pixel signal leakage reduction correction process for the specific color pixel signal when the specific color pixel signal is saturated. What is claimed is: 1. A pixel signal color mixing reduction device which has a primary color of R (red), G (green), and B (blue) and executes a color mixing defect suppressing process for a pixel signal in which specific colors are arranged in a checkered pattern. ,
First correction processing means for subtracting, from the specific color pixel signal, a fixed percentage of signal components calculated from pixel signals other than the specific color that are vertically adjacent to the specific color pixel signal;
First processing stop instruction means for instructing stop of the adjacent pixel signal leakage reduction correction processing for the specific color pixel signal when the specific color pixel signal is saturated;
Second correction processing means for subtracting, from the pixel signals other than the specific color, a fixed percentage of signal components calculated from the specific color pixel signals vertically adjacent to the pixel signals other than the specific color,
And a second process stop command means for commanding stop of the adjacent pixel signal leakage reduction correction process for the pixel signal other than the specific color when the pixel signal other than the specific color is saturated. Color mixing reduction device. What is claimed is: 1. A pixel signal color mixing reduction device which has a primary color of R (red), G (green), and B (blue) and executes a color mixing defect suppressing process for a pixel signal in which specific colors are arranged in a checkered pattern. ,
First correction processing means for subtracting, from the specific color pixel signal, a fixed percentage of signal components calculated from pixel signals other than the specific color that are vertically adjacent to the specific color pixel signal;
Second correction processing means for subtracting, from the pixel signals other than the specific color, a fixed percentage of signal components calculated from the specific color pixel signals vertically adjacent to the pixel signals other than the specific color,
A pixel signal color mixture reduction device, comprising: processing stop command means for commanding stop of the signal leakage reduction correction processing by the first and second correction processing means when the pixel signal is saturated. What is claimed is: 1. A pixel signal color mixing reduction device which has a primary color of R (red), G (green), and B (blue) and executes a color mixing defect suppressing process for a pixel signal in which specific colors are arranged in a checkered pattern. ,
First correction processing means for subtracting, from the specific color pixel signal, a fixed percentage of signal components calculated from pixel signals other than the specific color adjacent to the specific color pixel signal in the horizontal direction;
Second correction processing means for subtracting a fixed percentage of signal components calculated from pixel signals other than the specific color vertically adjacent to the specific color pixel signal from the specific color pixel signal,
A process stop command unit for commanding a stop of the signal leakage reduction correction process by the first and second correction process units when the specific color pixel signal reaches a saturation level. Reduction device. What is claimed is: 1. A pixel signal color mixing reduction device which has a primary color of R (red), G (green), and B (blue) and executes a color mixing defect suppressing process for a pixel signal in which specific colors are arranged in a checkered pattern. ,
First correction processing means for subtracting from the specific color pixel signal a signal component of a fixed ratio calculated from pixel signals other than the specific color adjacent to the specific color pixel signal in the horizontal direction;
Second correction processing means for subtracting, from the pixel signals other than the specific color, a fixed percentage of signal components calculated from the pixel signals other than the specific color and the specific color pixel signals adjacent in the horizontal direction;
A third correction process of subtracting, from an output signal of the first correction processing means as an input signal, a specific proportion of a signal component calculated from a pixel signal of a specific color pixel signal other than a specific color vertically adjacent to the specific color pixel signal from the specific color pixel signal; Means,
Fourth, a signal component of a fixed ratio calculated from a specific color pixel signal vertically adjacent to a pixel signal other than the specific color is subtracted from a pixel signal other than the specific color from an output signal of the second correction processing unit as an input signal. Correction processing means;
A first saturation / unsaturation determination circuit that stops the adjacent pixel signal leakage reduction correction processing for the specific color pixel signal when the specific color pixel signal reaches the saturation level;
And a second saturation / non-saturation discriminating circuit for stopping the adjacent pixel signal leakage reduction correction processing for the pixel signal other than the specific color when the pixel signal other than the specific color reaches the saturation level. Signal color reduction device. What is claimed is: 1. A pixel signal color mixing reduction device which has a primary color of R (red), G (green), and B (blue) and executes a color mixing defect suppressing process for a pixel signal in which specific colors are arranged in a checkered pattern. ,
First correction processing means for subtracting, from the specific color pixel signal, a fixed percentage of signal components calculated from pixel signals horizontally adjacent to the specific color pixel signal;
Second correction processing means for subtracting a fixed percentage of signal components calculated from pixel signals vertically adjacent to the specific color pixel signal from the specific color pixel signal using the output signal of the first correction processing means as an input signal;
A pixel signal color mixing reduction apparatus, comprising: a processing stop command unit for commanding the first and second correction processing units to stop the signal leakage reduction correction process when the correction target pixel signal is saturated. The correction target specific color pixel signal level is saturated and the correction target peripheral specific color pixel signal level adjacent to the diagonally upper right, diagonally lower right, diagonally upper left, and diagonally lower left of the correction target specific color pixel signal is saturated. The pixel signal color mixture reduction device according to any one of claims 1 to 9, further comprising a saturation / non-saturation determination circuit that stops the adjacent pixel signal leakage correction processing. The correction target specific color pixel signal level is saturated and the correction target specific color pixel signal adjacent to the diagonally upper right and lower left of the correction target specific color pixel signal is saturated, or the correction target specific color pixel signal level is saturated and the correction target specific color pixel When the level of the correction target peripheral specific color pixel signal adjacent to the diagonally lower right and diagonally upper left of the signal is saturated, or when the level of the correction target specific color pixel signal is saturated and the level of the specific color pixel signal to be corrected is diagonally upper right, diagonally lower right, diagonally upper left, 10. The circuit according to claim 1, further comprising a saturation / non-saturation determination circuit that stops the adjacent pixel signal leakage reduction correction processing for the specific color pixel signal when the level of the specific color pixel signal adjacent to the correction target neighboring diagonally lower left is saturated. 5. The pixel signal color mixing reduction device according to any one of the above items When the correction target specific color pixel signal level is saturated and the correction target peripheral specific color pixel signal level adjacent to the diagonally upper right, diagonally lower right, diagonally upper left, and diagonally lower left of the correction target specific color pixel signal is not saturated, The signal level of the correction target specific color pixel signal after the correction processing obtained by performing the adjacent pixel signal leakage reduction correction processing on the correction target specific color pixel signal is diagonally upper right, diagonally lower right, and diagonally upper left of the correction target specific color pixel signal. If the signal level of the correction target peripheral specific color pixel signal obtained by performing the adjacent pixel signal leakage reduction correction processing on the correction target peripheral specific color pixel signal adjacent diagonally to the lower left is lower than the correction target specific color pixel signal, Level adjusting means for making the signal level of the pixel signal the same as the signal level of the peripheral specific color pixel signal to be corrected after the correction processing;
When the correction target specific color pixel signal level is saturated and the correction target peripheral specific color pixel signal adjacent to the upper right, lower right, lower left, upper left, and lower left of the correction target specific color pixel signal is saturated, the correction target specific color pixel signal is 10. The pixel signal color mixture reduction device according to claim 1, further comprising a processing stop instruction unit for instructing the adjacent pixel signal leakage reduction processing to stop. The correction target specific color pixel signal level is saturated and the correction target peripheral specific color pixel signal adjacent to the upper right, lower left, lower right and lower left and upper left of the correction target specific color pixel signal is not saturated and the correction target The signal level of the correction target specific color pixel signal after the correction processing obtained by performing the adjacent pixel signal leakage reduction correction processing on the specific color pixel signal is in the vicinity of the correction target adjacent to the oblique upper right and lower left of the specific color pixel signal to be corrected After the correction processing obtained by performing the adjacent pixel signal leakage reduction correction processing on the specific color pixel signal, the adjacent pixel signal leakage reduction correction processing is performed on the correction target specific color pixel signal that is higher than the signal level of the correction target peripheral specific color pixel signal. After the correction process, the signal level of the correction target specific color pixel signal obtained from the correction target peripheral pixel adjacent to the diagonally lower right and diagonally upper left of the correction target specific color pixel signal is obtained. If the signal level of the peripheral specific color pixel signal to be corrected after the correction processing obtained by performing the adjacent pixel signal leakage reduction correction processing on the color pixel signal is smaller than the signal level of the specific color pixel signal to be corrected The first level which is the same as the signal level of the correction target surrounding specific color pixel signal obtained by performing the adjacent pixel signal leakage reduction correction processing on the specific color pixel signal adjacent to the diagonally lower right and diagonally upper left of the pixel signal Level adjusting means,
The correction target specific color pixel signal level is saturated and the correction target peripheral specific color pixel signal adjacent to the upper right, lower left, lower right and lower left and upper left of the correction target specific color pixel signal is not saturated and the correction target The signal level of the correction target specific color pixel signal after the correction processing obtained by performing the adjacent pixel signal leakage reduction correction processing on the specific color pixel signal is in the vicinity of the correction target adjacent to the oblique upper right and lower left of the specific color pixel signal to be corrected After the correction processing obtained by performing the adjacent pixel signal leakage reduction correction processing on the specific color pixel signal, the adjacent pixel signal leakage reduction correction processing is performed on the correction target specific color pixel signal that is smaller than the signal level of the correction target peripheral specific color pixel signal. The signal level of the correction target specific color pixel signal obtained after the correction processing is the specific color pixel signal adjacent to the oblique lower right and upper left of the correction target specific color pixel signal. If the signal level of the correction target peripheral specific color pixel signal after the correction processing obtained by the adjacent pixel signal leakage reduction correction processing is larger than the signal level of the correction target specific color pixel signal, Second level adjusting means for making the same as the signal level of the correction target peripheral specific color pixel signal obtained by performing signal leakage reduction correction processing on the correction target peripheral specific color pixel signal adjacent to the diagonally upper right and diagonally lower left. And the processing stop command means,
When the correction target specific color pixel signal level is saturated and the correction target peripheral specific color pixel signal level adjacent to the upper right and lower left of the correction target specific color pixel signal is saturated, or the diagonal of the correction target specific color pixel signal When the level of a specific color pixel signal adjacent to the correction target adjacent to the lower right and diagonally upper left is saturated or when the target color adjacent to the correction target specific color pixel signal is adjacent to the diagonally upper right, diagonally lower right, diagonally upper left, or lower left diagonally, 13. The pixel signal color mixing reduction device according to claim 12, wherein when the color pixel signal level is saturated, the adjacent pixel signal leakage correction processing for the correction target specific color pixel signal is stopped.

Images