JP3369713B2 - Video camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera,
In particular, for example, single-panel type
Color signal C given to solid-state image sensor through color filter
₁, C_TwoAnd C_ThreeSpecific pixels of solid-state image sensor based on
Color signal C corresponding to_1C, C_2CAnd C _3CGenerate the
Regarding video cameras. [0002] 2. Description of the Related Art Referring to FIG.
1 is a signal output from a CCD (Charge Coupled Device) 2.
The color signals RGRG ... and BGBG ...
The data is captured by the data 3 and 5 × 5 pixels are sampled. So
Then, the sampled pixels are those shown in FIG.
, Is shown in FIGS. 35 (B), (C) and (D).
Center by linear approximation using a filter of tap coefficients
Output signal R corresponding to the pixel_out, G_outAnd B_outTo
Had been created. At this time, the output signal R_out, G_{ou t}And
And B_outCan be expressed by Equation 4. [0003] [Equation 4] R_out= R_C G_out= G_L B_out= B_L R_C: Color signal R at the center pixel G_L: Average value of color signal G in peripheral pixels B_L: Average value of color signal B in peripheral pixels [0004] However, such a problem is not solved.
In the conventional video camera 1, V shown in FIG. 36 and FIG.
G in direction and H_outSignal, R_outSignal and
And B_outAs can be seen from the frequency characteristics of the signal, R_outFaith
No. and B_outThe sampling frequency of the signal is G_{ou t}signal
1 / 2N (Hz) (N: Nike
Above), all are folded by the sampling theorem.
I will return. Also, it can be seen from the phase characteristics shown in FIG.
So, R_outSignal and B_outSignal phase is 1 / 2N
(Hz) or more. Of this frequency characteristic
Color moiré appears on the screen due to differences and differences in phase characteristics.
There was a problem of tying. Make this color moiré stand out
As shown in FIG. 39, the lens 4 and the CCD
2, the cut-off frequency is about 1.2 N (Hz)
Consider placing a crystal filter 5 (curve A in FIG. 40).
However, in this case, in addition to aliasing components, correct signal
The problem is that some parts are cut and the resolution becomes worse.
there were. Therefore, the main object of the present invention is to provide a solution.
Color moiré can be improved without reducing image resolution
To provide a video camera. [0006] According to the present invention, a pixel is provided.
Through a single-plate color filter with different spectral characteristics
Color signal C given to the image element₁, C_Two, And C_ThreeBased on
Output color signal C corresponding to a specific pixel of the solid-state imaging device
_1OUT, C_2OUTAnd C_3OUTVideo camera
And the color signal C₁Given C_1LLes
If the bell is larger than a predetermined value, the output color signal C_1OUT, C
_2OUTAnd C_3OUTIs calculated according to Equation 3, and C_1LLevel is
If it is smaller than the fixed value, the output color signal C_1OUT, C_2OUTand
C_3OUTIs a video camera that obtains according to Equation 4. (Equation 3) C_1OUT= C₁ C_2OUT= C_2L・ C₁/ C_1L C_3OUT= C_3L・ C₁/ C_1L (Equation 4) C_1OUT= K₁・ C₁+ K_Two・ C₁ C_2OUT= K₁・ C_2L・ C₁/ C_1L+ K_Two・ C_2L C_3OUT= K₁・ C_3L・ C₁/ C_1L+ K_Two・ C_3L C_1L: C at specific pixel and peripheral pixels₁Two-dimensional file
Filter output C_2L: C in peripheral pixels_TwoTwo-dimensional filter output C_3L: C in peripheral pixels_ThreeTwo-dimensional filter output K₁, K_Two:C _1L levelCoefficient that changes according to [0007] [0008] [Effect] For example, a green checkerboard RB line sequentially passes through a pattern color filter.
For example, R, G and B signals given to the CCD
Are, for example, a GBGB signal and an RGRG signal.
Output through a plurality of 1H delay circuits.
For example, it is input to a two-dimensional filter. Two-dimensional filter smell
For example, R, G and B signals in 5 × 5 pixels
Is sampled. And the sampling pattern
Is a low-pass signal according to the tap coefficient corresponding to
R_L, G_LAnd B_LWhen the signal is calculated and output
Then, the color signal at a specific pixel of the sampling pattern is
Output as is. And the color signal at the specific pixel
Is RNumber 5According to the center image of the specific pixel
Output color signal R corresponding to the element_OUT, G_OUTAnd B_OUTSought
Can be [0009](Equation 5) R_OUT= R G_OUT= G_L・ R / R_L B_OUT= B_L・ R / R_L [0010] 【The invention's effect】theseAccording to the invention ofBased on a given formula
FollowColor signal C_1OUT, C_2OUTAnd C_3OUTIs created
Therefore, the sampling frequency is reduced in a pseudo manner compared to the linear approximation.
Color, which reduces color without loss of resolution.
Moire can be improved. [0011] The above and other objects and features of the present invention are described below.
The features and advantages are described in detail in the following examples, with reference to the drawings.
The detailed explanation will become more apparent. [0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG.
10 includes a lens 12 and is captured by the lens 12
The captured image is a PSCCD (Progressive Scan Charge)
Coupled Device) 16. To PSCCD16
Is a green checkered R on which color filters are arranged as shown in FIG.
A B-line sequential pattern color filter 18 is provided, and the lens 12 is
The passed image passes through the PSCCD through the color filter 18.
16 photosensitive sections. The image is given to the photosensitive unit
The accumulated charge is used to generate a timing pulse.
The horizontal and vertical transfer pulses output from the circuit 18
2 lines are output simultaneously by the drive circuit 20 operating
Is done. The horizontal and vertical transfer pulses will be described later.
The horizontal and vertical synchronizing signals supplied from the synchronizing signal
It is created based on the period signal. In addition, about PSCCD
, The Journal of the Institute of Television Engineers of Japan Vol.48, No.2, pp178
-183 (1994), "1/2 inch all-pixel readout"
And a CCD imaging device. The output GBGB signal and RGRG
... The signals pass through the CDS / AGC circuits 22a and 22b.
After that, the digital signals are output by the A / D converters 24a and 24b.
Is converted to a number. Of these, conversion is performed by the A / D converter 24a.
The color signal obtained is directly supplied to the two-dimensional filter 26.
And one of the 1H delay filters 27a and 27b
And a two-dimensional filter (FIR filter) 2 through both
6 given. Also, it is converted by the A / D converter 24b.
When the color signal is directly applied to the two-dimensional filter 26,
One of the 1H delay filters 27c and 27d and
And the signal is supplied to the two-dimensional filter 26 through both. 2D
In the filter 26, among the input color signals,
6 (A), FIG. 13 (A), FIG. 20 (A) or FIG.
The color signal at the pixel shown in FIG.
6 (B) to (D), FIGS. 13 (B) to (D), and FIGS.
20 (B) to (D) or FIGS. 27 (B) to (D)
Filter by tap coefficient. Therefore, 2
From the dimensional filter 26, a low-pass signal R_Lsignal,
G_LSignal and B_LA signal is output. 2D filter
From the sampled color signal,
Color signal (center data) at the center pixel of the ring pattern
T) R_C, G_COr B_CIs output as is. FIG. 6B, FIG. 13B, FIG.
(B) and FIG. 27 (B) show G_LTo create the signal
6 (C), FIG. 13 (C), and FIG.
FIG. 20C and FIG._LCreate a signal
FIG. 6D and FIG.
(D), FIG. 20 (D) and FIG._LSignal
This represents a tap coefficient to be created. The R output from the two-dimensional filter 26_LFaith
The signals are multipliers 28a and 38b and selector 32b and
32c and the arithmetic circuit 30 and G_LThe signal is a multiplier
28b and 38d and selectors 32a and 32c
To the arithmetic circuit 30. Also, B_LThe signal is multiplier 2
8c and 38f, selectors 32a and 32b, and operation
Circuit 30 and the center data R_C, G_COr
B_CAre multipliers 28a, 28b and 28c and selector 3
6a, 36b and 36c and the arithmetic circuit 30
You. In the arithmetic circuit 30, the same color as the center data
Low-pass signal R _L, G_LOr B_LBased on the level of
And the coefficient K according to the graph shown in FIG.₁And K_TwoIs calculated
Will be issued. Then, the calculated coefficient K₁Is the multiplier 38
a, 38c and 38e, the coefficient K_TwoIs a multiplier
38b, 38d and 38f. Selector 3
The center data is shown in FIG.
Output from the synchronizing signal generation circuit 42 when
The signals shown in FIGS. 4B to 4D are the select signals.
As shown in FIG. 5A.
When the signal changes, the signals shown in FIGS.
This is provided as an event signal. FIG. 4B and FIG.
(C) and select signals shown in FIGS. 5 (C) and (D).
May change as shown by the dotted line. According to this select signal, selector 32
The signals output from a, 32b and 32c are respectively
Divided dividers 34a, 34b and 34c.
According to these signals, the multipliers 28a, 28b and 28c
These output signals are divided. Dividers 34a, 34b and
Output signals from the selectors 36a, 3c
6b and 36c. Selectors 36a, 36
b and 36c also output from the synchronization signal generation circuit 42.
FIG. 4 (E)-(G) or FIG. 5 (E)-(G)
Is input as a select signal,
Then, the selected signal is multiplied by multipliers 38a and 38c and
38e. And multipliers 38a and 38
b is added by the adder 40a, and the adder 40a
From the color signal R corresponding to the central pixel_outIs output. Ma
The output signals of the multipliers 38c and 38d are
b, and the color corresponding to the central pixel from the adder 40b
Signal G_outIs output. Further, a multiplier 38e and
The output signal of 38f is supplied to the adder 40c,
0c to the color signal B corresponding to the center pixel_outIs output
You. From this, the sampling is performed by the two-dimensional filter 26.
Of the sampling pattern of the
The color signal in the element is R_C, The output signal R_OUT, G
_OUTAnd B_OUTIsNumber 6It is represented by [0018](Equation 6) R_OUT= K₁・ R_C+ K_Two・ R_C G_OUT= K₁・ G_L・ R_C/ R_L+ K_Two・ G_L B_OUT= K₁・ B_L・ R_C/ R_L+ K_Two・ B_L Also, the color signal sampled by the two-dimensional filter 26
Color signal at the center pixel of the sampling pattern
Is G_C, The output signal R_OUT, G_OUTAnd B_OUT
IsNumber 7It is represented by [0019](Equation 7) R_OUT= K₁・ R_L・ G_C/ G_L+ K_Two・ R_L G_OUT= K₁・ G_C+ K_Two・ G_C B_OUT= K₁・ B_L・ G_C/ G_L+ K_Two・ B_L・ G_C/ G_L Further, the pixels sampled by the two-dimensional filter 26
Color signal at the center pixel of the sampling pattern
Is B_C, The output signal R_OUT, G_OUTAnd B_OUT
IsNumber 8It is represented by [0020](Equation 8) R_OUT= K₁・ R_L・ B_C/ B_L+ K_Two・ R_L G_OUT= K₁・ G_L・ B_C/ B_L+ K_Two・ G_L B_OUT= K₁・ B_C+ K_Two・ B_C Note that the coefficient K changes as shown in FIG.₁
And K_TwoAnd add each constant.
The reason is that if the level of the same color as the center data is small,Number 6
R in_C/ R_L,Number 7G in_C/ G_LandNumber 8To
B in_C/ B_LIs greatly affected by noise,
An appropriate output signal corresponding to the center pixel can be obtained.
Because it is gone. The color signal at the pixel shown in FIG.
G when sampled_outSignal, R_outSignal and B
_outThe frequency characteristics of the signal are shown in Figs.
11 and 12 show the phase characteristics with respect to the horizontal frequency and the horizontal frequency.
Show. 7 and 8 show K₁= 1 and K_Two= 0
Where the frequency characteristics in the V and H directions are
FIG. 11 shows K₁= 1 and K_Two= 0
The phase characteristic is shown. FIGS. 7B and 7C and FIG.
As can be seen from (B) and (C), R_{ou t}Signal characteristics
Sex and B_outIn signal characteristics, 2 / 3N to N (H
z), there is a folded component, which causes
In the phase characteristic shown in FIG. 11, from around 2 / 3N (Hz)
R_CSignal and B_CThe phase of the signal is shifted. On the other hand, FIG. 8 and FIG.₁= 0 and K_Two=
Frequency characteristics in V direction and H direction when 1
FIG. 12 shows K₁= 0 and K_Two= 1
3 shows the phase characteristics of FIG. In this case, FIGS. 9 and 10
As you can see from G_outSignal characteristics, R_outSignal characteristics and
And B_outIn any of the signal characteristics, ＮN to N
(Hz), an aliasing component occurs.
R shown in FIG._CSignal and B_CSignal phase characteristics
The phase shift of both signals from around 1 / 2N (Hz)
Has occurred. From this, R_outSignal, G_outSignal and
And B_outThe frequency characteristic of the signal is K₁And K_TwoDepending on the value of
7 and 9 were mixed in the V direction.
8 and 10 in the H direction.
Characteristics. Also, R_outSignal and G_outFaith
The phase characteristics of the signal
And sex. The R, G and B signals of the pixel shown in FIG.
R obtained by sampling_out, G_out
And B_outFIG. 14 shows the frequency characteristics and phase characteristics of a signal.
17 to FIG. 17, FIG. 18 and FIG. You
That is, K₁= 1 and K_TwoV direction when = 0 and
The frequency characteristics in the H direction are shown in FIGS.
I am now, K₁= 1 and K_TwoPhase characteristic when = 0
The characteristics are as shown in FIG. FIG. 14 (A) and
(C) and FIGS. 15 (A) and (C).
And G_outSignal characteristics and B_out2 / 3N of signal characteristics
The aliasing component occurs between N (Hz).
As can be seen, N (Hz) from around 2 / 3N (Hz)
G over_outSignal and B_outPhase shift with the signal
I have. Also, K₁= 0 and K_TwoV when = 1
16 and the frequency characteristics in the H direction are shown in FIGS.
As shown in FIG.₁= 0 and K_Two= 1
Are as shown in FIG. FIG. 16 and
As can be seen from FIG. _outSignal characteristics, R_outsignal
Characteristics and B_out1 / 2N in any of the signal characteristics
To N (Hz), a folded component is generated, and FIG.
As can be seen from FIG.
G over z)_outSignal and B_outPhase shift from signal
I am From this, R_out, G_outAnd B_outsignal
The frequency characteristic of₁And K_TwoDepending on the value of
In FIG. 14, the characteristics are obtained by mixing FIGS.
15 and 17 in the H direction.
Characteristics. G_outSignal and B_outSignal place
The phase characteristic is K₁And K_TwoFIG. 18 and FIG.
This is a characteristic obtained by mixing FIG. The R, G and the pixels in the pixel shown in FIG.
And R output by sampling the B signal_outsignal,
G_outSignal and B_outFIG. 21 to FIG. 21 show frequency characteristics of signals.
24 and FIG. 25 show the phase characteristics. This
21 and FIG.₁= 1 and K_Two= 0
The frequency characteristics in the V and H directions
Yes, G_outSignal characteristics and R_outIn signal characteristics
Is that the aliasing component occurs between 2 / 3N and N (Hz)
I have. 23 and FIG.₁= 0 and K_Two=
Frequency characteristics in V direction and H direction when 1
And G _outSignal characteristics, R_outSignal characteristics and
B_outIn any of the signal characteristics, ＮN to N (H
A folded component occurs between z). On the other hand, FIG.₁= 1 and K_Two= 0
R in case_outSignal and G_outThe phase characteristics of the signal,
Phase of both signals from 2 / 3N (Hz) to N (Hz)
Deviation has occurred. FIG. 26 shows K₁= 0 and K_Two=
R when it is 1_outSignal and G_outSignal place
Shows phase characteristics, from 1 / 2N (Hz) to N (Hz)
, The phase of both signals is shifted. Than this,
R_outSignal, G_outSignal and B_outSignal frequency characteristics
Is K₁And K_TwoIn the V direction according to the value of
21 and FIG. 23 in the H direction.
In this case, the characteristics are obtained by mixing FIGS.
You. Also, R_outSignal and G_outThe phase characteristic of the signal is
K₁And K_Two25 and 26 according to the value of
Characteristics. The R signal at the pixel shown in FIG.
Output by sampling the G and B signals.
R forced_outSignal, G_outSignal and B_outSignal circumference
The wave number characteristics and the phase characteristics are shown in FIGS.
And 33. That is, K₁= 1 and K_Two
= 0, frequency characteristics in the V and H directions.
The sex becomes as shown in FIG. 28 and FIG._Csignal
Characteristics and B_CBetween 2 / 3N and N (Hz) of signal characteristics
A folded component occurs. FIG. 30 and FIG.
K₁= 0 and K_Two= 1 in the V and H directions
Frequency characteristics in G_outSignal characteristics, R
_outSignal characteristics and B_outIn any of the signal characteristics
Also, aliasing components occur between 1 / 2N and N (Hz)
I have. On the other hand, FIG.₁= 1 and K_Two= 0
R in case_outSignal and B_outShow the phase characteristics of the signal
And the phase shift of both signals from around 2 / 3N (Hz)
Has occurred. FIG. 33 shows K₁= 0 and K_Two= 1
R when_outSignal and B _outShows the phase characteristics of the signal
And the phase shift of both signals around 1 / 2N (Hz)
Has occurred. From this, R_outSignal, G_outSignals and
B_outThe frequency characteristic of the signal is K₁And K_TwoDepending on the value of
28 and 30 in the V direction.
29 and 31 in the H direction.
It becomes a mixed characteristic. Also, R_outSignal and B
_outThe phase characteristic of the signal is K₁And K_TwoDepending on the value of
The characteristic is obtained by mixing FIG. 32 and FIG. In this embodiment,Equation 6, Equation 7 and Equation 8To
Therefore, the output signal R_OUT, G_OUTAnd B_OUTIs calculated
7 to 10, FIGS. 14 to 17, FIGS. 21 to 24
As can be seen from FIGS.
The ring frequency has been raised, which
Minute ratio is smaller than before. Also, around 1 / 2N
Of the frequency characteristic at the time is smaller than that of the related art.
12, 13, 18, 19, 25, and FIG.
26, FIG. 32 and FIG.
Is improved than before. Therefore, the center data and
When the level of the same color signal is large, the color moiré
The resolution can be increased at the same time
When the level of the same color signal as the
The effect of the above can be suppressed. In this embodiment, the lens 12 and the PS
Although nothing is arranged between the CCD 16 and the CCD 16, FIG.
As shown in the curve B, the cutoff frequency is 1.4N (H
By disposing a crystal filter of about z), FIG.
The conventional video camera 1 shown in FIG.
Color frequency as low as 1.2 N (Hz)).
Cracking can be improved, and at the same time,
Can also increase the resolution.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is an illustrative view showing a green checkered pattern sequential color filter; FIG. 3 is a graph showing a part of the operation of the embodiment in FIG. 1; FIG. 4A is an illustrative view showing center data;
(B) and (C) are waveform diagrams showing a _BL select signal, (D) is a waveform diagram showing a _GL select signal,
(E)-(G) are waveform diagrams showing a center data select signal. FIG. 5A is an illustrative view showing center data,
(B) and (C) are waveform diagrams showing a _BL select signal, (D) is a waveform diagram showing a _GL select signal,
(E)-(G) are waveform diagrams showing a center data select signal. 6A is an illustrative view showing a color signal of a pixel to be sampled, and FIGS. 6B to 6G are illustrative views showing tap coefficients of each pixel; FIG. 7 (A) is a waveform diagram showing a frequency characteristic of the G _out signal in the V direction, (B) R in V direction _out
It is a waveform diagram which shows the frequency characteristic of a signal, (C) is a waveform diagram which shows the frequency characteristic of a _Bout signal in a V direction. 8A is a waveform diagram showing a frequency characteristic of a G _out signal in an H direction, and FIG. 8B is a waveform diagram showing R _out in an H direction.
It is a waveform diagram which shows the frequency characteristic of a signal, (C) is a waveform diagram which shows the frequency characteristic of the _Bout signal in H direction. 9A is a waveform diagram illustrating a frequency characteristic of a G _out signal in a V direction, and FIG. 9B is a waveform diagram illustrating R _out in a V direction.
It is a waveform diagram which shows the frequency characteristic of a signal, (C) is a waveform diagram which shows the frequency characteristic of a _Bout signal in a V direction. 10A is a waveform diagram showing a frequency characteristic of a G _out signal in an H direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is H
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. FIG. 11 is a waveform chart showing phase characteristics of an R _out signal and a B _out signal. FIG. 12 is a waveform diagram showing phase characteristics of an R _out signal and a B _out signal. 13A is an illustrative view showing a color signal of a pixel to be sampled, and FIGS. 13B to 13G are illustrative views showing tap coefficients in each pixel. FIG. 14A is a waveform diagram showing a frequency characteristic of a G _out signal in a V direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is V
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. FIG. 15A is a waveform diagram showing a frequency characteristic of a G _out signal in the H direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is H
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. FIG. 16A is a waveform diagram showing a frequency characteristic of a G _out signal in a V direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is V
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. 17A is a waveform diagram illustrating a frequency characteristic of a G _out signal in the H direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is H
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. FIG. 18 is a waveform diagram showing phase characteristics of a G _out signal and a B _out signal. FIG. 19 is a waveform chart showing phase characteristics of a G _out signal and a B _out signal. 20A is an illustrative view showing a color signal of a pixel to be sampled, and FIGS. 20B to 20G are illustrative views showing tap coefficients of each pixel. FIG. FIG. 21A is a waveform diagram showing a frequency characteristic of a G _out signal in a V direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is V
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. FIG. 22A is a waveform diagram showing a frequency characteristic of a G _out signal in an H direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is H
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. 23A is a waveform diagram showing a frequency characteristic of a G _out signal in a V direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is V
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. 24A is a waveform diagram showing a frequency characteristic of a G _out signal in the H direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is H
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. FIG. 25 is a waveform chart showing the phase characteristics of the R _out signal and the G _out signal. FIG. 26 is a waveform chart showing the phase characteristics of the R _out signal and the G _out signal. 27A is an illustrative view showing a color signal of a pixel to be sampled, and FIGS. 27B to 27G are illustrative views showing tap coefficients in each pixel. FIG. FIG. _28A is a waveform diagram showing a frequency characteristic of a G _out signal in a V direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is V
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. FIG. 29A is a waveform diagram showing the frequency characteristics of a G _out signal in the H direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is H
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. FIG. _30A is a waveform diagram showing a frequency characteristic of a G _out signal in a V direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is V
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. FIG. 31A is a waveform diagram showing a frequency characteristic of a G _out signal in the H direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is H
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. FIG. 32 is a waveform chart showing phase characteristics of an R _out signal and a B _out signal. FIG. 33 is a waveform chart showing the phase characteristics of the R _out signal and the B _out signal. FIG. 34 is a block diagram showing a conventional technique. FIG. 35 (A) is an illustrative view showing a color signal of a pixel to be sampled, and (B) to (D) are illustrative views showing tap coefficients; FIG. _36A is a waveform diagram showing a frequency characteristic of a G _out signal in the H direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is H
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. FIG. 37 (A) is a waveform diagram showing a frequency characteristic of a G _out signal in a V direction, and FIG.
_It is a waveform diagram which shows the frequency characteristic of an _out signal, (C) is V
FIG. 7 is a waveform diagram illustrating frequency characteristics of a B _out signal in a direction. FIG. 38 is a waveform chart showing the phase characteristics of the R _out signal and the B _out signal. FIG. 39 is a block diagram showing another conventional technique. FIG. 40 is a graph showing frequency characteristics of a crystal filter. [Description of Signs] 16 CCD 26 Two-dimensional filters 28a to 28c, 38a to 38f Multipliers 34a to 34c Dividers 32a to 32c, 36a to 36c Selectors 40a to 40c Adder 30 Operation circuit 42 ... Synchronous signal generation circuit

Claims (1)

(1) A solid-state imaging device based on color signals C ₁ , C ₂ , and C _{3 applied} to a solid-state imaging device through a single-plate color filter having different spectral characteristics depending on pixels. Output color signals C _1OUT , C _2OUT and C 2 corresponding to specific pixels of the element
A video camera for generating _3Out, when the color signal C ₁ is supplied to the specific pixel, C _1L
If the level is larger than a predetermined value, the output color signals C _1OUT , C _2OUT and C _3OUT are obtained according to _Equation 1, and if the C _1L level is smaller than the predetermined value, the output color signals C _1OUT , C _2OUT and C _{3OUT are obtained.} According to Equation 2,
Video camera. ## _EQU1 ## C _1OUT = C ₁ C _2OUT = C _2L · C ₁ / C _1L C _3OUT = C _3L · C ₁ / C _1L C _1OUT = K ₁ · C ₁ + K ₂ · C ₁ C _2OUT = K ₁ · C _2L · C ₁ / C _1L + K ₂ · C _2L C _3OUT = K ₁ · C _3L · C ₁ / C _1L + K ₂ · C _3L C _1L : Two-dimensional of C ₁ in a specific pixel and peripheral pixels filter output C _2L: two-dimensional filter output C _3L of C ₂ in the peripheral pixels: the two-dimensional filter outputs K ₁ of C ₃ in the peripheral pixels, K _2: coefficient that varies according to C _1L level