JP3483732B2 - Color imaging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates to a complementary color checkerboard color filter.
Color imaging for obtaining color signals using a filter image sensor
It concerns the device. [0002] 2. Description of the Related Art There are various types of color imaging devices.
However, one example of a complementary color single-plate system having good sensitivity is disclosed in Japanese Patent Laid-Open No. 7-773.
No. 3 and its outline is described below.
You. Provided on the imaging surface of a solid-state imaging device such as a CCD
For example, as shown in FIG.
A first row in which row (Ye) and cyan (Cy) repeat in order
Inn, magenta (Mg), green (G)
The second line to return and the yellow as in the first line above
-, A third line in which cyan repeats in order, and the second line
Green and magenta, which are the reverse of the line, repeat in order.
The arrangement with the fourth line to be returned repeats in the same manner thereafter.
Is to be returned. An image pickup device having such an array of color filters
Example of NTSC system in signal processing using elements
First, the color signal processing will be described. N fee
In the field, the corner Ye + Mg is added first in the image sensor.
Cy + G is calculated at the next timing in the image sensor.
Is added. When processing as a color signal,
Subtract these in the n lines of the   (Ye + Mg)-(Cy + G) = R + G + B + R- (B + G + G)                               = 2R-G And a color difference signal containing a red component is obtained. The calculation
Approximate calculation is performed on the way. The result is N + 1
Can be obtained in the same way on the n-line
Is 1 vertically in N and N + 1 fields.
This is because the pixel is shifted. Next, in the n + 1 line of the N field,
The Ye + G and Cy + Mg read from the pixel
Subtract   (Ye + G)-(Cy + Mg) = R + G + G- (B + G + B + R)                               =-(2B-G) As a result, a color difference signal including a blue component is obtained. What
Note that the same approximate calculation is performed during the calculation. This
Results in the n + 1 line of the N + 1 field
A beam is obtained as well. Thus, in a certain N field,
2R-G and-(2B-G) are output every other line
It becomes intermittent in line-sequential form. It should be noted that
Of pixels, that is, the addition of Ye and Mg or the addition of Cy and
While the addition of G is performed in the image sensor,
After subtraction, that is, (Ye + Mg)-(Cy
+ G) subtraction between left and right adjacent ones is sample
After the hold, a subtraction circuit 46 (see FIG. 12) described later.
Is being done. Next, an image pickup device having the color filters arranged as described above.
Among the signal processing using the elements, we will explain about the luminance signal generation.
I will tell. The luminance signal rises when read from the image sensor.
As described above, the output of the upper and lower adjacent pixels
Add neighbors or sample pixel output
Frequency which is much lower than the
Low-pass fill up to about 1/4 of the ring rate
Data obtained by limiting the band. When a luminance signal is generated by an addition operation,
The above filter outputs Ye + Mg and Cy + G
, And on the n-th line, Ye + Mg + CyG = 2R + G + B + B + 2G = 2B + 3G + 2R Is obtained. Also, in the next n + 1 line
Is the sum of Ye + G and Cy + Mg,
The result is G + Cy + Mg = 2B + 3G + 2R. Thus, Ye, G, Cy and Mg are always
A luminance signal is generated by adding as a set. This
At the time, the spectral sensitivity characteristics of a human as shown in FIG.
Approximate the visibility characteristics by 2R + 3G + 2B,
It can be handled as this (equivalent to Y). Next, with reference to FIG.
Image processing device that generates signal and luminance signal
I do. The subject light image is captured by the solid-state imaging
It is input to the CCD 42, which is an image element, where it is photoelectrically converted.
After that, a correlated double sampling circuit (hereinafter abbreviated as CDS)
Write. ) 43 to reduce random noise
U. The output of the CDS 43 is divided into two, and the first sample
To the hold circuit 44 and the second sample and hold circuit 45
Input and perform sample hold. That is, as shown in FIG.
g, Cy + G, etc., plus two vertically adjacent pixels
The output of D42 is connected to these two sample and hold circuits 4
Sample hold pulse for color separation according to 4, 45
Sample and hold every other pixel with 1 and 2
Swelling. More specifically, a first sample hold circuit
At 44, the sample and hold pulse 1 as shown in FIG.
Sample and hold the first Ye + Mg,
Skips Cy + G and sums third Ye + Mg
And skip the fourth Cy + G again
Swelling. On the other hand, the second sample hold
In the circuit 45, the first sample-and-hold pulse 2
Skip the second Ye + Mg and skip the second Cy + G
Pull hold, skip third Ye + Mg again
Sample and hold the fourth Cy + G
ing. To generate the above-described color signal, the first
From the output of the sample hold circuit 44 to the second sample hole
The output of the circuit 45 is subtracted by the subtractor 46, that is,
An output is obtained by subtracting Cy + G from Ye + Mg.
ing. The output is a low-pass filter (LP in the figure)
Abbreviated as F. ) Is input to 47 to perform band control.
You. The output C0 of the low-pass filter 47 is divided into two.
One is input to the 1H delay 48, and the other is
The signal is input to a multiplexer 49 which is a switch circuit. In the 1H delay 48, the above
The calculation results 2R-G and 2B-G are as shown in FIG.
Obtained in chronological order. That is, the low-pass filter 47
When the first pulse of the output signal C0 is 2R-G
The output signal C1 of the 1H delay 48 is one time earlier
(That is, the 0th) 2BG. Next time, 1
The second 2R-G appears in the signal C1 and the signal C0 at this time
Becomes the first 2B-G. In the same manner,
In time, the first 2B-G appears in the signal C1,
Signal C0 becomes the second 2R-G. [0013] In this way, the two shifted one by one
The two signals C0 and C1 are input to the multiplexer 49.
Then, by switching there, only 2R-G
Output signal CR and output signal of 2B-G only
And CB. That is, the output to the signal CR is first of C0
Select the first 2R-G, then 2H delayed by 1H
Select C1 which is a copy of R-G, and then C2
The second 2R-G of C1, and the second 2R-G of C1
Is selected in the same manner, and similarly, 2R-G
Is selected only. Thus,
The signal CR repeats the first 2R-G output twice,
Repeat the second 2R-G output twice, and so on.
The 2R-G output is repeated twice. Similarly, in the signal CB, C
From each signal of 0 and C1, only 2BG is sequentially selected, and
The same output is repeatedly output twice. Thus, the signal CR or the signal CB is simply
Looking at Germany, the same output is repeated twice each.
Therefore, the reproducible vertical frequency is
The upper limit is の of the frequency, and the color resolution is the horizontal scanning line.
１ ／ or less. Also, the same output is not repeated twice.
Interpolation using two 1H delays (2R-G
In the line, interpolate from 2B-G before and after and simultaneously with 2R-G
There is also a method of obtaining a simplified 2B-G output).
Abbreviate. If the above contents are expressed two-dimensionally,
FIG. 15 shows an example. In FIG. 15,
Indicates that the direction from the top to the bottom of the number indicates the traveling direction of the scan line.
And it almost corresponds to the time axis. Therefore, laterally
For those that are complete, output at the same time
Become. Referring to FIG. 15, the operation as described above is performed.
Is explained in correspondence with the scanning line of the television signal.
The first line of the color filter of the CCD 42 shown in FIG.
Signal from Ye of the second line and Mg from the second line
By processing, C0 outputs the first 2R-G
You. By selecting the next two lines of the CCD 42,
Therefore, as the second scanning line, C0 is the first 2B-G
Is output. Select the next two lines of the CCD 42
As a result, as the second scanning line, C0 is the first scanning line.
2B-G is output. In this way, the second
2R-G and the second 2B-G are selected line-sequentially. Next, the output of C1 is that C0 is lower by one horizontal time.
, The first 2R-G is the second
Output to line. And the first 2B-G is the third
Line, and the second 2R-G appears on the fourth line.
Is forced. In this manner, the multiples are obtained from these C0 and C1.
Lexa 49 selected 2R-G only, CR
What only BG is selected is output to CB
I have. [0022] What has been described above is a complementary color single plate.
The upper and lower pixels are added within the image sensor using the image sensor.
Interlaced scanning (also called interlaced scanning)
It is an example of a signal processing method. In this case, the signal processing circuit
Only the interlace drive output of the complementary color single-chip image sensor.
Processed. In recent years, there has been a growing demand for image input devices for personal computers.
And the scanning of personal computer monitors
Progressive scanning (also called progressive scanning)
A corresponding signal processing method is required. Also, signal processing
Even if the road is the conventional method (use to output video to TV monitor)
Of course, because it is used, it is not only for progressive scanning,
Compatible with both interlaced and progressive
Versatile and desirable. The present invention solves such a conventional problem.
And both interlaced and progressive
Color shooting with a signal processing circuit that can handle
It is an object to provide an imaging device. [0025] [MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In addition, the present invention relates to an imaging element provided with a complementary color checkerboard color filter.
Scanning with interlaced scanning
Luminance / color signal generation
The interlaced scanning or the
Depending on whether it is a logarithmic scan, the luminance / color signal generation means
It is equipped with a means for switching the processing method.
The signal processing circuit can be shared regardless of the scanning method.
There are advantages. [0026] DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention
Uses an image sensor with complementary color checkerboard color filters.
Color imaging device,Calculate the difference between adjacent pixels
1st subtraction means and 1 for delaying the output of the image sensor by 1H
H delay and adjacent pixels of the output signal of the 1H delay
Second subtraction means for calculating a difference, and the first subtraction means
And the difference between the output of the second subtraction means and the output of
Third subtraction means, an output of the first subtraction means,
First adding means for calculating the sum of the output of the second subtracting means and the output of the second adding means
And second addition means for calculating the sum of the upper and lower pixels;
Third addition for calculating the sum of the upper and lower pixels adjacent to the upper and lower pixels
Means, the output of the second adding means and the third adding means.
Fourth adding means for calculating the sum of the outputs of the stages;
The output of the subtraction means and the output of the first addition means are
When the driving method of the image sensor is interlaced scanning or progressive
Switching by drive status identification signal indicating whether it is sib scanning
A first switching unit, an output of the second subtraction unit,
And the output of the subtraction means is switched by the drive state identification signal.
Second switching means for switching, and an output of the second adding means
And the output of the fourth adding means, the driving state identification signal
Switching means for switching according toColor imaging with
It is a device and shares a signal processing circuit regardless of the scanning method.
Has the effect of being able to.In addition, conventional
Just add a simple circuit to the signal processing method of
Can realize a progressive signal processing method.
It has the action of: [0027] Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 relates to a first embodiment of the present invention.
Showing the configuration of an image processing device in a color imaging device
It is. In FIG. 1, 1 is an imaging optical system, 2 is a solid-state imaging
The elements CCD, 3 are CDS, 4 is interlaced
5 is a luminance / color generation circuit for an inspection signal, and 5 is a progressive scanning signal.
Signal luminance / color generation circuit, 6 is two luminance / color generation circuits 4
And 5 that switch between # 5 and # 5. Next, the operation in this embodiment will be described.
explain. The subject light image is solid-state through the imaging optical system 1.
The signal is input to the CCD2, which is the image sensor, and then is correlated double sampled.
Input to CDS3 for pulling. CDS3
The output signal is a driving state identification signal indicating the driving state of the CCD 2.
Signal, the luminance / color generation time for the interlaced scanning signal
Path 4 or luminance / color generation circuit 5 for progressive scanning signal?
Is selected by the multiplexer 6 according to the scanning method.
Perform signal processing. As described above, according to the first embodiment of the present invention.
Then, the interlaced scanning signal luminance / color generation circuit 4
A luminance / color signal generation circuit 5 for a progressive scanning signal is provided.
In response to a drive state identification signal indicating the drive state of the CCD 2,
Thus, the signal generation method for the CDS output signal is
By switching with KUSA 6, the correctness according to the scanning method
Signal generation, and is independent of the scanning method.
The signal processing circuit can be shared. (Embodiment 2) FIG. 2 shows a second embodiment of the present invention.
The image processing device in the color imaging device according to the embodiment
FIG. 3 is a diagram illustrating a configuration, and illustrates an interface according to the first embodiment.
-Lase / Signal Luminance / Color Generation Circuit 4 and Progression
Of the luminance / color generation circuit 5 for scanning signals and the multiplexer 6
It shows details. In FIG. 2, reference numeral 10 denotes imaging optics
System, 11 is a CCD which is a solid-state image sensor, 12 is a CDS,
13 is a 1H delay for delaying the output signal of the CDS 12 by 1H.
Ray 14 is a first sample and hold circuit (first SH in the figure).
Abbreviated. ) And 15 are the second sample and hold circuits (FIG.
Abbreviated as middle second SH. ), 16 is the third sample hole
Circuit (abbreviated as third SH in the figure), and 17 is the fourth sun.
Pull-hold circuit (abbreviated as fourth SH in the figure), 18
Is the second sample from the output of the first sample and hold circuit 14.
First subtraction circuit for subtracting the output of the
Reference numeral 9 denotes a third sampler in which the output signal of the CDS 12 is delayed by 1H.
From the output of the sample hold circuit 16
A second subtraction circuit for subtracting the output of the path 17;
The output of the second subtraction circuit 19 is subtracted from the output of the circuit 18
A third subtraction circuit 21 outputs the output of the first subtraction circuit 18 and the second subtraction.
A first adding circuit for adding the output of the arithmetic circuit 19,
The output of the one sample hold circuit 14 and the second sample hold
A second addition circuit for adding the output of the field circuit 15;
DS12 output signal delayed by 1H
The output of the hold circuit 16 and the output of the fourth sample and hold circuit 17
A third addition circuit for adding the output to the second addition circuit 24;
4 to add the output of the second adder 2 and the output of the third adder 23.
The arithmetic circuit 25 performs a first subtraction operation based on the drive state identification signal.
Either the output of the path 18 or the output of the first adder 21
First multiplexer to be selected (abbreviated as first MPX in the figure)
You. ) And 26 are the second subtraction times based on the drive state identification signal.
Either the output of the path 19 or the output of the third subtraction circuit 20
Second multiplexer to be selected (abbreviated as second MPX in the figure)
You. ) And 27 are the output of the first multiplexer 25 and the second
A third key for selecting one of the outputs of the
A multiplexer (abbreviated as 3rd MPX in the figure), 28
The output of the second addition circuit 22 is determined based on the drive state identification signal.
A fourth key for selecting one of the outputs of the fourth adder circuit 24
This is a multiplexer (abbreviated as fourth MPX in the figure). Next, the operation of this embodiment will be described.
You. The subject light image is solid-state imaged through the imaging optical system 10.
Input to the CCD 11 of the device, and then correlated double sampling
Input to the CDS 12 for performing Exit CDS12
The force signal is divided into a system that passes through the 1H delay and a system that does not.
You. Thereafter, the interlaced scanning and the progress
A description will be given of each time of the sib scanning. First, interleave
This is a process at the time of source scanning. The output signal of CDS12 is bisection
The first sample and hold circuit 14 and the second sample and hold circuit 14
Sampled and held by the
U. That is, as shown in FIG. 3, Ye + Mg, Cy + G
The output of CCD 11 which adds two vertically adjacent pixels such as
By the two sample and hold circuits 14 and 15
And hold pulses SHP1 and SHP for color separation
2 to sample and hold every other pixel
Has become. More specifically, the NTSC N field n
In the line, the first sample hold circuit 14
The sample hold pulse SHP1 shown in FIG.
Sample and hold the second Ye + Mg and the second Cy
+ G is skipped and the third sample Ye + Mg is sampled.
And skip the fourth Cy + G again.
ing. On the other hand, the second sample hold circuit 1
5, the sample hold pulse SHP2 causes the first
Skip the second Ye + Mg and skip the second Cy + G
Pull hold, skip third Ye + Mg again
Sample and hold the fourth Cy + G
ing. To generate the above-described color signal, the first
From the output of the sample hold circuit 14
The output of the circuit 15 is subtracted by the first subtraction circuit 18.
With the above, an output is obtained by subtracting Cy + G from Ye + Mg.
Swelling. Therefore, N field n + 1 line
In the same manner, Cy + Mg was subtracted from Ye + G.
Get the output. The output signal of the first subtraction circuit 18 is
The subtraction results 2R-G and 2B-G are as shown in FIG.
Can be obtained in time series.
The color difference signals are 2R-G and 2B-G
I will treat it. ). The third sample-and-hold circuit 16
Is an n-1 line of N fields as an input signal.
The first hold pulse SHP1
Ye + G is sampled and held, and the second Cy + Mg is
Skip and sample and hold the third Ye + G,
The fourth Cy + Mg is skipped again
You. On the other hand, the fourth sample and hold circuit 17
Is the first by the sample hold pulse SHP2.
Skip Ye + G and sample the second Cy + Mg
Hold, skip the third Ye + G again and go to No.4
Cy + Mg of the eye is sampled and held
You. Then, in order to generate the above-described color signal, the third sump is used.
From the output of the sample hold circuit 16
Subtraction of the output of the path 17 by the second subtraction circuit 19
To obtain an output obtained by subtracting Cy + Mg from Ye + G.
It has become. Therefore, for N fields and n lines
Similarly, the output obtained by subtracting Cy + G from Ye + Mg is
I am getting it. The output signal of the second subtraction circuit 19 is
The subtraction results 2R-G and 2B-G are as shown in FIG.
Can be obtained in time series.
The color difference signals are 2R-G and 2B-G
I will treat it. ). Next, the driving method of the image sensor is interlaced.
Drive status indicating whether the scan is a scan or a progressive scan
The first and second multiplexers 2 according to the state identification signal.
5 and 26 are a first subtraction circuit 18 and a second subtraction circuit, respectively.
19, and the third multiplexer 2
7, the color signal CR includes a 2R-G signal and a color signal CB.
Outputs a 2BG signal as a color difference signal. For the luminance signal, the first sample hole
Circuit 14 and the second sample-and-hold circuit 15 in the second addition
The sum is added by the circuit 22, and the driving method of the
Drive indicating whether scanning is scan or progressive scan
In response to the state identification signal, the fourth multiplexer 28 performs the second addition.
Arithmetic circuit 22Output signal is selected and output as a luminance signal.
It is. The above is the processing at the time of interlace scanning. Next, the processing at the time of progressive scanning will be described.
You. The output signal during progressive scanning is
The upper and lower additions inside the image sensor, such as during scanning, are not performed.
Ye, Cy, Mg, and G are each read as a signal of one pixel.
Is spilled out. And the output signal of CDS12 is divided into two
The first sample hold circuit 14 and the second sample hold
Input to the hold circuit 15 and performs sample hold.
That is, as shown in FIG.
1 output from these two sample-and-hold circuits 14, 1
5, sample hold pulse SHP1 for color separation,
SHP2 samples and holds every other pixel
It has become. More specifically, in the n-th line, the first sun
In the pull hold circuit 14, a sample hold as shown in FIG.
The first pulse Ye is sampled by the hold pulse SHP1.
And skip the second Cy and skip the third Ye
Sample hold and skip the fourth Cy again
It has become. On the other hand, the second sample hole
Circuit 15 uses the sample and hold pulse SHP2.
Skip the first Ye and sample the second Cy
Hold, skip the third Ye again and fourth
Is sampled and held. Soshi
From the output of the first sample and hold circuit 14
The output of the pull hold circuit 15 is output by the first subtraction circuit 18
By subtracting, you can get the output which subtracted Cy from Ye.
Swelling. The output signal in this case is Ye-Cy = R + GBG = RB Can be approximated. Therefore, similarly, in the (n + 1) th line,
To obtain an output obtained by subtracting G from Mg.
You. The output signal in this case is Mg-G = B + RG Can be approximated. In the n + 2 line, similarly,
An output obtained by subtracting Cy from Ye is obtained,
The output signal in this case is Ye-Cy = R + GBG = RB Can be approximated. In the n + 3 line, similarly,
An output obtained by subtracting MgG from G is obtained,
The output signal in this case is G-Mg = GBR Can be approximated. The output signal of the first subtraction circuit 18 is
The subtraction result is obtained in a time series as shown in FIG. The third sample and hold circuit 16 and the fourth sample
The output of the pull hold circuit 17 is the first sample hold
Circuit 14 and the output of the second sample and hold circuit 15
The signal is delayed by 1H. Similarly, the third sample
Output of hold circuit 16 and fourth sample hold circuit 1
7 is subtracted from the output of the second subtraction circuit 19.
Also, the first subtraction circuit 18 is a signal delayed by 1H. example
If the output of the first subtraction circuit 18 is Ye-Cy = RG (n
+3 lines), the output of the second subtraction circuit 19 is GM
g = GBR (n + 2 lines). The above second subtraction
The output signal of the circuit 19 is such that the result of the subtraction is as shown in FIG.
Time series. Next, the output of the first subtraction circuit 18 and the second subtraction
The addition and subtraction with the output of the path 19 are performed by the first addition circuit 21 and the third addition circuit.
This is performed by the subtraction circuit 20. This calculation result is shown in FIG.
This is shown in the Mining chart. Thus, the color difference signal 2
An RGB signal and a 2BG signal are obtained. Next, the driving method of the image sensor is interlaced.
Drive status indicating whether the scan is a scan or a progressive scan
According to the state identification signal, the first and second multiplexers 25,
26 is a first addition circuit 21 and a third subtraction circuit, respectively.
20 output signals, and the third multiplexer 2
7, the color signal CR includes a 2R-G signal and a color signal CB.
Outputs a 2BG signal as a color difference signal. For the luminance signal, the sum of the four pixels,
(Ye + Mg + G + Cy), the first sample
Output circuit 14 and the second sample-and-hold circuit 15
Force, output of third sample hold circuit 16 and fourth sample
A second adder circuit performs addition with the output of the hold circuit 17
22, a third addition circuit 23, and a fourth addition circuit 24,
Whether the drive method of the image sensor is interlaced scanning or not
A drive state identification signal indicating whether the scan is a progressive scan is performed.
The output of the fourth adder circuit 24 is output by the fourth multiplexer 28.
A signal is selected and output as a luminance signal Y. As described above, the complementary color checkerboard color filter
Progressive scanning using an image sensor with a filter
When generating a color difference signal in the case of
A first subtraction circuit 18 for calculating and an image sensor output is delayed by 1H
1H delay 13 and the output of this 1H delay 13
A second subtraction circuit 19 for calculating an adjacent pixel difference between the force signals,
Of the output of the first subtraction circuit 18 and the output of the second subtraction circuit 19
A third subtraction circuit 20 for calculating the difference and a first subtraction circuit 18
To calculate the sum of the output of the second subtraction circuit 19 and the output of
By using the adder circuit 21, the color difference can be
A signal can be generated. The basic circuit configuration is
-Shared with processing used in signal processing method during race scanning
Interlaced, progressive, etc.
A circuit independent of the scanning method can be easily constructed. [0048] As described above, the present invention provides a complementary color filter.
Output by driving the image sensor having progressive scanning
Can generate a luminance signal and a color difference signal with a simple circuit.
And share with interlaced processing
Scans such as interlaced and progressive
We can provide a color imaging device that is independent of the system
You.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an image processing apparatus according to Embodiment 1 of the present invention. FIG. 2 is a block diagram showing an image processing apparatus according to Embodiment 2 of the present invention. FIG. 4 is a timing chart for explaining the operation of the image processing apparatus according to the second embodiment of the present invention; FIG. 4 is a timing chart for explaining the operation of the image processing apparatus according to the second embodiment of the present invention; FIG. 6 is a timing chart for explaining the operation of the image processing apparatus according to the second embodiment. FIG. 6 is a timing chart for explaining the operation of the image processing apparatus according to the second embodiment of the present invention. FIG. 8 is a timing chart for explaining the operation of the processing apparatus. FIG. 8 is a timing chart for explaining the operation of the image processing apparatus according to the second embodiment of the present invention. FIG. 10 is a schematic diagram showing an arrangement of color filters provided in a complementary color single-plate CCD. FIG. 11 is a characteristic diagram showing human luminosity characteristics. FIG. 12 is a conventional image processing. FIG. 13 is a timing chart showing each output of the conventional image processing apparatus. FIG. 14 is a timing chart showing each signal component processed by the conventional image processing apparatus. Schematic diagram expressed two-dimensionally corresponding to the scanning line of a television signal [Description of reference numerals] 1, 10, 41 Imaging optical system 2, 11, 42 CCD 3, 12, 43 CDS 4 Luminance / color for interlace scanning signal Generating circuit 5 Progressive scanning signal luminance / color generating circuit 13, 48 1H delay 21, 22, 23, 24, 50 Addition circuits 18, 19, 20, 46 Subtraction circuits 6, 25, 26, 27, 28 49 MPX (multiplexer) 14 Chapter 1SH (sample and hold) 15 second 2SH (sample and hold) 16 Chapter 3SH (sample and hold) 17 second 4SH (sample and hold) 47 LPF

Claims (1)

(57) [Claims] [Claim 1] An imaging element provided with a complementary color checkerboard color filter
A first subtraction means for calculating the difference between adjacent pixels, a 1H delay for delaying the output of the image sensor by 1H, and a second subtraction means for calculating the adjacent pixel difference of the output signal of the 1H delay in the color imaging device using the child . Subtraction means, and the first
A third subtraction means for calculating a difference between an output of the subtraction means and an output of the second subtraction means, and a sum of an output of the first subtraction means and an output of the second subtraction means. First adding means and second adding means for calculating the sum of upper and lower pixels
Calculating the sum of the upper and lower pixels adjacent to the upper and lower pixels
3 and the output of the second adding means and the third adding means.
A fourth adding means for calculating the sum of the outputs of the adding means of
The output of the first subtraction means and the output of the first addition means
The driving method of the image sensor is interlaced scanning or
It is switched off by the drive status identification signal indicating whether it is a logarithmic scan.
First switching means for switching and an output of the second subtracting means
And the output of the third subtracting means, the driving state identification signal
Switching means for switching by means of
The output of the stage and the output of the fourth adding means in the driving state
A third switching means for switching according to the identification signal.
And a color image pickup device.