JPH05153509A - Color image pickup recorder - Google Patents

Abstract

PURPOSE:To improve the vertical resolution and the color reproducibility even for moving picture or a still picture by implementing field storage processing when the moving picture is recorded and implementing frame storage processing when the still picture is recorded. CONSTITUTION:Prescribed processing such as pre-amplifying, white balance, gamma correction is implemented to a signal read from a color solid-state image pickup element CCD 1 by a pre-processing section 3. Then the processed signal is converted into a digital signal by an A/D converter 4 and the result is inputted to a field storage processing section 5 and a frame storage processing section 6. The video signal and a still picture output obtained respectively by the processing sections 5, 6 are fed to a recording medium 7, in which the signals are stored therein. A CCD 1 has the field storage mode and the frame storage mode, and the mode changeover is implemented by a drive pulse of a drive circuit 2. Thus, excellent picture quality is obtained for both a moving picture and a still picture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image pickup recording apparatus using a solid-state image pickup device.

[0002]

2. Description of the Related Art In video cameras, especially video cameras having a built-in VTR section (hereinafter, simply referred to as "video camera"), digitalization of signal processing is being promoted in order to reduce size, increase functionality, and improve image quality. .. Along with this, a video camera having a still image recording mode using digital signal processing has been commercialized. However, recording a still image with a video camera has the following problems.

A color solid-state image pickup device is used in the image pickup system of this type of video camera, and the color filter array is suitable for image pickup of moving images such as Ye, Cy, G, and M as shown in FIG.
A g-mosaic array (Array K) is used. With such a filter arrangement, only a field image can be obtained when recording a still image, so the vertical resolution is poor. In addition, the color reproducibility is poor because the color filters are complementary colors.

On the other hand, an electronic still camera has been developed as a system for recording still images. There are two types of electronic still cameras, one for analog recording using a floppy disk or the like as a recording medium and the other for digital recording using a semiconductor memory (RAM or the like). For still images, color S /
In order to place importance on N and color reproducibility, R, G, B primary color arrays are generally used for color filters of color solid-state imaging devices. There are field recording and frame recording as recording modes, but there is no color filter array that satisfies the image quality in both modes, and it is unavoidable that either mode is emphasized. Color filter arrays (arrays L and M) suitable for frame recording are shown in FIGS.
(B) shows color filter arrays (arrays N and O) suitable for field recording.

In the case of field recording, since it is necessary to generate a regular color image signal with a signal every other line, the arrangement of the color filters is inevitably arranged in the vertical direction at an interval of 2 pixels. Therefore, when trying to obtain a frame image with this color filter array, the vertical color resolution becomes poor. On the other hand, in frame recording, since color filters can be arranged at intervals of one pixel in the vertical direction as shown in FIG. 17, it is possible to increase the vertical color resolution. However, if an attempt is made to obtain a field image with this color filter array for frame recording, for example,
Only the R and G signals are output in the field, and only the B and G signals are output in the second field, and a normal color image signal cannot be obtained.

As a color filter array that can be used in both field recording and frame recording modes, there is an RGB stripe array (array P) shown in FIG. 19. In this array, the horizontal color filter array is 3 pixels. Since the pitch is used, there is a drawback that the horizontal resolution is poor.

On the other hand, among digital still cameras, a digital recording electronic still camera using a semiconductor memory as a recording medium digitally processes an image signal, so that there is no image quality deterioration due to signal processing and a high quality still image can be obtained. In addition, since the digital image data is recorded in the semiconductor memory, a rotating mechanism is not required, which reduces power consumption, downsizes the camera body, and improves reliability. It is superior to the analog recording still camera used. In addition, connection with a personal computer or communication device is simple, and image processing and data compression are possible by digital signal processing.

FIG. 42 shows a basic configuration diagram of a conventional digital recording electronic still camera. In the case of consumer use, the solid-state image sensor 81 may be a single plate.
The color filters of R are R (red), G (green), and B (blue). The R signal, the G signal, and the B signal obtained by these color filters are amplified by the preamplifier 82, and before being digitized by the A / D converter 85, the white balance correction circuit 83 at the stage of the analog signal. In general, the gamma correction circuit 84 performs a correction process. However, when performing these correction processes by analog processing, downsizing in terms of the size of circuit components and the number of adjustment points,
It is disadvantageous for cost reduction.

By the way, the FIT used for moving images
When a frame type (frame interline transfer type) solid-state image sensor is applied to an electronic still camera that is a system for recording still images, and a frame image is to be obtained by using it, it is time-consuming to read the first field and the second field. Such a difference causes a level difference between fields, resulting in deterioration of image quality.

This problem will be described with reference to FIG. Figure 4
3 is a schematic view of a FIT type solid-state image pickup device, in which a vertical transfer unit 92 is provided adjacent to a column of pixel light receiving units 91 having a photoelectric conversion function such as a photodiode. The charge of each pixel light receiving portion 91 is transferred to the corresponding vertical transfer portion 92 by the field shift pulse φV1, and is transferred to the charge storage portion 94 which is an analog memory by the pulse φT via the transfer gate 93. The signal charge of the charge storage section 94 is output to the output terminal OUT as an electric signal from the output circuit 96 by the pulse φH via the horizontal transfer section 95 by the pulse φV2.

In actual photographing, after the signal charges are stored in the pixel light receiving portion 91 for a time period corresponding to the shutter speed, first, the signal charges are transferred to the vertical transfer portion 92 in the first field. The signal of the first field is transferred at high speed to the charge storage section 94, and then the signal of the second field is transferred to the empty vertical transfer section 92. Since the accumulation time of the second field is long by this time difference, a level difference occurs between both fields. Since this time difference is usually a fixed time, the shorter the shutter speed, that is, the shorter the accumulation time, the more the problem becomes. The accumulation period is started by transferring the unnecessary charges accumulated up to that time to the vertical transfer unit 92 and transferring them to the charge sweeping unit 97.
Alternatively, there is a type in which unnecessary charges are forcibly removed in the CCD substrate direction.

By delaying the start of the storage period of the second field, the storage time can be made the same. Specifically, in sweeping out unnecessary charges to the charge sweeping unit 97, the second field charge output timing to the vertical transfer unit 92 is delayed by the time difference generated between fields when the above-mentioned signal charges are vertically transferred. realizable.
However, even at this time, the difference in signal level remains between fields due to the influence of smear.

The signal charge of the first field is stored in the charge storage section 9
No. 4 is being read one line at a time, the second
The field signal charges are in the vertical transfer section 92. Although light is blocked by both the charge storage portion 94 and the vertical transfer portion 92, the pixel light receiving portion 91 is arranged adjacent to the vertical transfer portion 92, and the light incident on the pixel light receiving portion 91 is smeared by the vertical transfer portion 92. As a result, the signal charge increases.
As a matter of course, the amount of this leakage increases as the light incident on the pixel light receiving unit 1 becomes stronger.

The amount of incident light depends on the charge storage time (speed of the electronic shutter). Since the charge storage time decreases as the amount of incident light increases, the amount of charges leaking into the vertical transfer portion 92 decreases as the charge storage time decreases. Will increase. That is, the level difference between fields depends on the speed of the electronic shutter, and the shorter the shutter speed, the larger the level difference between fields.

Therefore, when a frame image is obtained by using the solid-state image pickup device as shown in FIG. 42, there is a problem that the image quality is deteriorated due to flicker or the like.

[0016]

As described above, when a still image is picked up and recorded by a video camera using a complementary color filter, there is a problem that the vertical resolution and color reproducibility are poor, and it is unsatisfactory as a still image. Only good image quality can be obtained. Further, the frame recording color filter array used in the electronic still camera cannot support field recording.

Further, in the conventional electronic still camera, white balance correction and gamma correction are performed in analog, which is disadvantageous in terms of circuit scale and adjustment. Further, when an FIT type image pickup device originally for moving images is used as the image pickup device, when trying to obtain a frame image, the image quality is deteriorated due to flicker due to the level difference between fields, and an extra correction circuit must be added. There were problems such as having to do it.

A first object of the present invention is to provide a color image pick-up / recording device which has good vertical resolution and color reproducibility for both moving images and still images.

A second object of the present invention is to accurately correct the level difference between fields with a simple circuit configuration in an electronic still camera using an image pickup device for moving images (image pickup device for reading out signal charges by interlacing). It is to provide an electronic still camera capable of performing the above.

[0020]

In order to achieve the first object of the present invention, a color solid-state image pickup device having a color filter, and a field accumulation process at the time of recording a moving image for an output signal from the color solid-state image pickup device. Field accumulation processing means for generating a color image signal, frame accumulation processing means for generating a color image signal by performing frame accumulation processing on a signal output from the color solid-state image sensor during still image recording, and the field accumulation processing means. A recording means for recording the color image signal generated by the processing means and the frame accumulation processing means.

Here, in the color filter of the color solid-state image pickup device, color filter elements in four rows and two columns are used as filter units, and these filter units are periodically arranged in the horizontal scanning direction and the vertical scanning direction orthogonal thereto. Is composed of
The two color filter elements in the first and third rows consist of a green filter element and a red or blue filter element whose positions in the horizontal scanning direction are set to the same, and the color filter elements in the second and fourth rows are It is preferable that the filter element includes a green filter element and a blue or red filter element whose positions in the horizontal scanning direction are reversed.

In order to achieve the second object of the present invention, in an electronic still camera which reads out signals by interlacing from a solid-state image pickup device and digitally records the image pickup signals, white balance is stored in a read-only memory (ROM). A gamma correction table corresponding to the data is provided, and this gamma correction table makes the gamma correction data of the first field different from the gamma correction data of the second field.
Alternatively, the selection criteria of the table are different between the first field and the second field.

Further, a gamma correction characteristic is prepared in the gamma correction table by using shutter speed data as a function, and the gamma correction characteristic is selected using the shutter speed data.

[0024]

According to the present invention, when a moving image is recorded, the moving image signal is read from the image pickup device by a field accumulation operation suitable for the moving image to perform signal processing for the moving image, and when the still image is recorded, the image pickup device is stopped. A moving image signal is read out by a frame accumulating operation suitable for an image and signal processing for a still image is performed to generate a regular color image signal.

Further, the color solid-state image pickup device and the above-mentioned color filter array are compatible with both of them, and satisfactory image quality can be obtained for both moving images and still images.

Further, in the present invention, since the white balance data and the gamma correction data that allows for the level difference between fields depending on the shutter speed are stored in the ROM, white balance correction and level difference between fields can be easily performed by digital processing. Each processing of correction and gamma correction is possible at once. As a result, the circuit scale is reduced and no adjustment is required, and a still image including a compact and high-quality frame image can be obtained.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the arrangement of a color image pickup / recording apparatus according to an embodiment of the present invention. A color solid-state image pickup device 1, a drive circuit 2, a preprocessing unit 3, an A / D converter 4, It is composed of a field accumulation processing unit 5, a frame accumulation processing unit 6 and a recording medium 7. The signal read from the color solid-state imaging device 1 is subjected to predetermined processing such as preamplification, white balance, gamma correction, etc. by the preprocessing unit 3,
After being converted into a digital signal (digital image signal) by the A / D converter 4, it is input to the field storage processing unit 5 and the frame storage processing unit 6. Video signal (moving image output) obtained by processing in the field accumulation processing unit 5
Then, the still image output obtained by the processing in the frame accumulation processing unit 6 is supplied to the recording medium 7 and recorded.

The color solid-state image pickup device 1 comprises a CCD image pickup device and color filters, and the color filters are arranged as shown in FIG. 2, for example. This color filter is configured such that color filter elements in four rows and two columns are used as filter units, and these filter units are periodically arranged in the horizontal scanning direction and the vertical scanning direction orthogonal thereto. 1st and 3rd row 2
The one color filter element is composed of a G (green) filter element and an R (red) filter element, and their phases (row direction = position in the horizontal scanning direction) are the same. The color filter elements in the second and fourth rows are G filter elements and B (blue) filter elements, and their phases are inverted. The R filter elements in the first and third rows may be replaced with B filter elements, and the B filter elements in the second and fourth rows may be replaced with R filter elements.

The color solid-state image pickup device 1 has a field accumulation mode and a frame accumulation mode, and the mode switching is realized by changing the drive pulse supplied from the drive circuit 2 to the color solid-state image pickup device 1.

FIGS. 3 and 4 show how the color solid-state image sensor 1 outputs in the field accumulation mode in the color filter array (array A) of FIG.

First, the signal processing in the field accumulation mode will be described with reference to FIG. In the field accumulation mode, pixel signals of two pixels adjacent in the vertical direction are added and output. Therefore, in the first field, (G + G), (R + R), ... Are output and the (N + 1) th is output.
(G + B), (G + R), ... Are output on the line. Similarly, in the second field, (G + G) on the N'th line,
(R + B), ... Are output, and (G + B), (G + R), ... Are output on the (N ′ + 1) th line.

The circuit configuration of the field storage processing circuit 5 is shown in FIG. In FIG. 10, two lines of parallel data of the digital image signal from the A / D converter 4 of FIG. 1 and a signal obtained by delaying the digital image signal by the 1H delay line 10 are input to the line switches 11a and 11b. The line switch 11a selects _{one of the} S ₁ (= G + G) and S ₂ (= R + B) signal lines, and the line switch 11b selects one of the S ₃ (= G + B) and S ₄ (= G + R) signal lines. Is selected. After that, the sample hold circuits (S / H) 12a to 12d cause the signals S ₁ , S ₂ ,
S ₃ and S ₄ are separated, subtraction circuits 13 and 14, matrix circuit 15 and low pass filters (LPF) 16 and 17
The color difference signals RY and BY are obtained through. On the other hand, the luminance signal is generated by one line through a low pass filter (LPF) 18.

The luminance signal (Y) and the color difference signal (RY,
The operation formula of BY) is shown below. (N-th _{line) Y = (S 1 + S} 2) / 2 = (G + G + R + B) / 2 R-Y = α 1 × (S 1 -S 2) + β 1 × (S 3 -S 4) B-Y = α ₂ × (S ₁ −S ₂ ) + β ₂ × (S ₃ −S ₄ ) (1) (N + 1th line) Y = (S ₃ + S ₄ ) / 2 = (G + G + R + B) / 2 R−Y = α ₁ × _{(S 1 -S 2) + β} 1 × (S 3 -S 4) B-Y = α 2 × (S 1 -S 2) + β 2 × (S 3 -S 4) (2) where, S ₁ = G + G, S ₂ = R + B, S ₃ = G + B,
S ₄ = G + R α ₁ , β ₁ , α ₂ , β ₂ are matrix coefficients.

As described above, the luminance signal is generated in one line, and the color difference signal is generated by using two lines of difference signals obtained in one line and multiplying each by a matrix coefficient. In the case of a video camera, the luminance signal Y and the color difference signals R-Y and B-Y thus obtained are converted into a video signal (for example, an NTSC signal) by the color encoder 19 and output as shown by a broken line in FIG. It

The image quality obtained by this is a little inferior when compared with the image quality of the currently used color filter array (array K in FIG. 16) because the sensitivity depends on the transmittance of the spectral transmission characteristics of the color filters. Since the degree of color modulation is large, the color S / N is good and the overall characteristics are comparable.

Since the signals obtained in the case of field accumulation are equivalently complementary colors, there is a tendency that the variation in color reproducibility becomes large with respect to changes in illumination conditions (changes in color temperature).
FIG. 11 shows a field storage processing circuit 5 that improves this point.
FIG. 6 is a circuit configuration diagram of the color difference signal system including multiplication circuits 31 and 32.
Has been added.

Generally, a reference color temperature (eg, 3,200) is used.
In the case of an illumination color temperature lower than K), color difference signals RY, B
Of -Y, the amplitude of RY becomes large and the amplitude of BY becomes small. On the contrary, when the illumination color temperature is high, the amplitude of RY becomes small and the amplitude of BY becomes large. Therefore,
When the color temperature is low, it is reproduced in reddish color, and when the color temperature is high, it is reproduced in bluish color. Therefore, in FIG. 11, the color difference signals RY and BY obtained by the matrix circuit 15 are multiplied by the correction coefficients according to the illumination color temperature by the multiplying circuits 31 and 32. For example, when the illumination color temperature is low, R-
The amplitude of Y is reduced and the amplitude of BY is increased. Conversely, when the illumination color temperature is high, the amplitude of RY is increased to B
-Reduce the Y amplitude. By controlling in this way, optimum color reproducibility can be obtained even if the illumination color temperature changes.

Next, the signal processing in the frame accumulation mode will be described with reference to FIG. The frame accumulation mode is
The video camera supports the still image recording mode.
In this case, the output signal of the color solid-state image sensor 1 is, as shown in FIG. 4, the Nth line G, R, G, R, ... (N + 1) th line G, R, G, R ,. In the two fields, the N'th line G, B, G, B, ... And the (N '+ 1) th line B, G, B, G ,. In this way, a signal that is completely different from the field storage is read out.

The circuit configuration of the frame accumulation processing circuit 6 is shown in FIG.
3 shows. In FIG. 13, one frame of the digital image signal from the A / D converter 4 of FIG. 1 is written in the buffer memory 20. This write operation is performed by interlacing, controlling the memory address when reading,
Two lines are output simultaneously with non-interlace. For example, when the signal of the N'th line is generated, the signals of the Nth line and the N'th line are read simultaneously. When generating the signal of the next line, the N'th line and the (N + 1) th line are read simultaneously. The recording format on the recording medium 7 at this time is to record one frame of data in a non-interlaced manner.

When the recording format on the recording medium 7 is such that the signal of the first field is recorded and then the signal of the second field is recorded to form one frame image (recording by interlacing), the buffer memory 20. This can be solved by the following reading method from. First, when the signal of the first field is generated, the Nth line and the Nth line are simultaneously read out, and then the (N + 1) th line and the (N '+ 1) th line are simultaneously read out. Further, when the signal of the second field is generated, the N'th line and (N +
1) Lines are read out simultaneously, and the (N '+ 1) th line and the (N + 2) th line are read out simultaneously. In this way, reading from the buffer memory 20 is performed according to the recording format of the recording medium 7.

The signal processing when recording on the recording medium 7 with non-interlacing will be described. Buffer memory 20
2 line signals read out (Nth line and N'th line
Line) is a sample hold circuit (S / H) 21a-
21d separates into four signals G _N , R _N , G _N ′, and B _N ′. These signals G _N , R _N , G _N ′, B
_N ′ is an adder circuit 22, 28 and a subtractor circuit 23, 24, 2
6, matrix circuit 25 and low pass filter (LP
F) 29, 30 to generate a luminance signal Y and color difference signals RY and BY. The calculation formula in this case is
Shown in (3) and (4). Regarding the luminance signal Y, the low-frequency luminance signal Y
_L and the high-frequency luminance signal Y _H are separately generated, the low-frequency and high-frequency are replaced, and the color reproducibility and the resolution are optimized. (The N _{'line) Y L = 0.3 (R N} -G N) +0.11 (B N' -G N ') + G N' Y H = 0.25 (G N + R N + G N '+ B N ′) R−Y = 0.7 (R _N −G _N ) −0.11 (B _N ′ −G _N ′) B−Y = −0.3 (R _N −G _N ) +0.89 (B _N ′ −G _N ′) (3) (N + 1th line) Y _L = 0.3 (R _{N + 1} −G _{N + 1} ) +0.11 (B _N ′ −G _N ′) + G _{N + 1} Y _H = 0.25 (G _{N + 1} + R _{N + 1} + G _N ′ + B _N ′) R−Y = 0.7 (R _{N + 1} −G _{N + 1} ) −0.11 (B _N ′ −G _N ′) different _{B-Y = -0.3 (R N} + 1 -G N + 1) +0.89 (B N '-G N') (4) at all the signal processing of such signal processing (field integration mode ) Is applied to the primary color filter array (arrays L and M) shown in FIG. 17 which is conventionally used for a still image frame image. It is possible to obtain an image quality equivalent to That is, since the color filter elements (here, R and B) are equivalently spaced by one pixel in the vertical direction, the filter arrangement is suitable for the frame image, and the vertical color resolution is good. Further, since the color reproducibility and the color S / N that are emphasized in still images are good, the image quality in the still image recording mode of the video camera according to the present embodiment is the arrangement of FIG. 16 used in the conventional video camera. Higher image quality can be expected than with a color filter array such as K.

Next, another embodiment of the present invention will be described. If the color filter array shown in FIG. 1 is used only for still images, a still image capturing / recording apparatus capable of performing both field recording and frame recording can be realized.

FIG. 5 shows an embodiment thereof. The field storage processing circuit 5 is used for field recording, and the frame storage processing circuit 6 is used for frame recording to the recording medium 7.
Signal is supplied to. In this embodiment, the recording medium 7 is common to the field recording and the frame recording, but in this case, if the identification signal of the field recording or the frame recording is also recorded at the time of recording on the recording medium 7, at the time of reproduction. Proper reproduction can be performed by referring to this identification signal.

In the embodiments of FIGS. 1 and 5, the field storage processing circuit 5 and the frame storage processing circuit 6 both perform digital processing, but as shown in FIG. 6, the A / D converter 4 is used. It is also possible to dispose them and configure the field storage processing circuit 5 by analog processing. Regarding the frame accumulation processing circuit 6,
Since it needs to be processed using correlation between fields,
Digital processing is more convenient.

As shown in FIG. 7, a recording medium 7a for recording a moving image and a recording medium 7b for recording a still image may be provided separately. In this case, as a matter of course, the recording format may be analog or digital, and moving image recording may be analog and still image recording may be digital.

In the above embodiments, the gamma correction is performed by the preprocessing circuit 3 by analog processing, but it may be performed by digital processing. FIG. 8 shows an embodiment thereof, and a digital image signal from an A / D converter (not shown) is given to the address input of the gamma correction ROM 8. This ROM8
There are prepared a gamma correction table for field storage and a gamma correction table for frame storage, and the optimum gamma correction coefficient is selected for each. Then, the gamma correction table is switched according to the recording mode.

Further, as shown in FIG. 9, gamma correction ROMs 8a and 8 are used for field storage and frame storage.
It is also possible to provide b separately.

In the field accumulation mode, when the gamma correction is performed immediately after A / D conversion as shown in FIG. 8 or 9, a level difference of the luminance signal occurs line by line in a subject with high saturation, which is a difference in image quality. It causes deterioration. This will be explained.

From the above equations (1) and (2), the luminance signals in the Nth line and the N + 1th line are Y _N = (S ₁ + S ₂ ) / 2 Y _{N + 1} = (S ₃ + S ₄ ) / 2 ( Given in 5). Here, the gamma correction is S ₁ , S ₂ ,
Since it is applied to S ₃ and S ₄ , it can be written as follows. Y _N = (Γ (S ₁ ) + Γ (S ₂ )) / 2 = (Γ (G + G) + Γ (R + B)) / 2 Y _{N + 1} = (Γ (S ₃ ) + Γ (S ₄ )) / 2 = (Γ (G + B) + Γ (G + R)) / 2 (6) where Γ (S) is a function for performing gamma correction on the signal.

As can be seen from equation (6), by taking the arithmetic mean of the signals that have undergone gamma correction (non-linear processing),
Generating a luminance signal. Here, it is assumed that signals having the following values have entered R, G, and B. R = 0.5, G = 0.0, B = 0.2 Further, the function of gamma correction is Γ (S) = S ^0.45 . The values of Y _N and Y _{N + 1} at this time are as follows. Y _N = (0 ^0.45 + (0.5 + 0.2) ^0.45 /2=0.426 Y _{N + 1} = (0.2 ^0.45 +0.5 ^0.45 ) /2=0.608 (7) Depending on the color, a level difference occurs in the luminance signal for each line, resulting in deterioration of image quality.

The method of this correction will be described with reference to FIG.
FIG. 12 is a configuration diagram of the field accumulation processing circuit 5 having such a correction function, and the color difference signals RY and BY.
Is generated in the same manner as in FIG. With respect to the luminance signal Y, the signals S ₁ and S ₂ (or S ₃ and S ₄ ) are added by the adding circuit 34 in a state where gamma correction is not performed. The output of the adder circuit 34 is stored in the ROM 35.
Gamma correction is performed by. The luminance signal Y thus generated is as in the following equation.

Y _N = Γ ((S ₁ + S ₂ ) / 2) = Γ ((G + G + R + B) / 2) Y _{N + 1} = Γ ((S ₃ + S ₄ ) / 2) = Γ (G + G + R + B) / 2) (8) As can be seen from the above equation (8), by performing the gamma correction after adding the signals, Y _N and Y _{N + 1} become exactly the same value, and the level difference between the lines of the luminance signal is Disappear.

FIG. 14 is a diagram showing an example of the structure of the field storage processing 5 which emphasizes color reproducibility in the field storage mode. In FIG. 14, signals (S ₁ , S ₂ , S ₃ , S ₄₎ composed of parallel data of two lines of a digital image signal from an A / D converter (not shown) and a signal delayed by the 1H delay line 10 ) Is converted by the matrix circuit 36 into primary color (R, G, B) system signals G ', R', B '. The calculation formula is shown in the following formula (9).

G ′ = 0.5 (S ₁ + S ₃ + S ₄ −S ₂ ) R ′ = S ₂ + S ₄ −S ₃ B ′ = S ₂ + S ₃ −S ₄ (9) Thus, first, the primary color system After being decomposed into the signal of, the white balance and gamma correction circuit 37 performs white balance and gamma correction. The calculation formula is shown in the following formula (10).

G _W = Γ (Kg · G ′) R _W = Γ (Kr · R ′) B _W = Γ (Kb · B ′) (10) where Kg, Kr, and Kb are white balance coefficients.

A color difference signal is generated by the matrix circuit 38 from the G _W , R _W and B _W. The calculation formula is the following formula (1
Shown in 1).

[0058] _{Y L = 0.3R W + 0.59G W} + 0.11B W R-Y = R W -Y L B-Y = B W -Y L (11) On the other hand, in the case of Figure 12 for the luminance signal Y Similarly to the above, after addition of two horizontal pixels in the adder circuit 34, the ROM 35
It is generated by applying gamma correction in.

As described above, when the color difference signal is generated, the color reproducibility is kept good by decomposing it into the signals of the primary color system and then applying the white balance and the gamma correction. The amount of change is also small. Note that the formula
When R ', G', and B'are generated according to the arithmetic expression of (9), since it is possible that a color false signal is generated in the vertical direction, there is also a method of performing a calculation that reduces the color false signal.

FIG. 15 shows various arrangements of color filters that can be used in the present invention. (A) is the color filter (arrangement A) shown in FIG. 1, and (b) is R and B in the arrangement A. Are replaced by color filters (array B), and (c) to (j) are color filters (arrays C to J) using complementary color systems (Ye, Cy, Mg, W) as color filter elements.

FIG. 20 shows the appearance of the color image-pickup recording apparatus according to the present invention. In this apparatus, a magnetic tape 41 for moving images and a memory card 42 for still images are used as recording media. A moving image is recorded on the magnetic tape 41 in analog or digital form. Still images are digitally recorded on the memory card 42.

Further, for capturing a still image in a dark place, the flash 43 is built in, and the flash 43 can be automatically emitted or the emission can be manually instructed. A shutter 45 is attached to the optical system 44. After capturing and recording a still image, by closing this shutter 45,
Block extra light. As the shutter 45, a mechanical shutter used in a film camera, a liquid crystal shutter, or the like can be used.

With this device, a still image can be recorded even while a moving image is being picked up. This state is shown in FIGS. 21 and 22.
FIG. 21 is a diagram showing the operation accompanying switching between the moving image mode and the still image mode on the time axis, and FIG. 22 is a flowchart. When the still image input command is received in the moving image mode, the moving image mode is interrupted and the apparatus enters the still image mode (S1 and S2).

After setting conditions suitable for still image shooting and sweeping out unnecessary carriers in the image pickup device 1, a still image signal is accumulated, and thereafter, an extra light is emitted until the signal is read from the image pickup device 1. Shutter 45
Close. The setting of the condition suitable for still image shooting is performed because there is a difference in the optimum value between the moving image and the still image in the aperture, shutter speed (charge accumulation time), and white balance.

Even in the still image mode, it is necessary to change the setting depending on whether the flash 43 is required (S3 to S5). This setting can be easily achieved by preparing moving image data and still image data in a controller (not shown) as shown in FIG. 23, and switching and using them. When the flash 43 is used, a still image is captured after the charging is completed (S6 to S7). When the flash 43 emits light, it emits light during the signal accumulation period. After this,
Return each setting to the video mode and then return to the video mode (S
7-S8).

The drive pulse of the image pickup device 1 also needs to be different in the moving image mode and the still image mode. For example, as described above, the field accumulation processing is performed in the moving image mode, the frame accumulation processing is performed in the still image mode, and in the case of a still image, the reading speed does not necessarily have to be the same as that of the moving image, and the signal from the image sensor 1 is slowly transmitted. It is also possible to read it. FIG. 24 shows an example of the drive circuit 2 when the drive signal is changed between the moving image mode and the still image mode.

When a still image is picked up while picking up a moving image, an effective moving image recording signal cannot be obtained because the read signal from the image sensor 1 in the still image mode is not for moving images. Even if a signal for a still image is subjected to moving image processing and recorded on a moving image medium, it cannot normally be reproduced normally.

FIG. 25 is a block diagram of a color image-pickup recording apparatus which solves this problem. The image signal from the color solid-state image sensor 1 is processed by the moving image processing unit 51 in the moving image mode and the still image processing unit 52 in the still image mode via the preprocessing unit 3 and the A / D converter 4. After that, they are recorded on the moving image recording medium 7a (magnetic tape 41 in FIG. 20) and the still image recording medium 7b (memory card 42 in FIG. 20), respectively.

A buffer memory 53 is connected to the moving image processing section 51 for moving image processing during the still image capturing period, and moving image data immediately before moving from the moving image mode to the still image mode is converted into one field, one frame, several fields or number. If a frame is stored in the buffer memory 53 and the signal stored in the buffer memory 53 is recorded in the moving image recording medium 7a during the still image mode, unpleasantness at the time of reproduction can be reduced.

FIG. 26 shows the state of the recording signal on the recording medium 7a at this time. i, i + 1, i + 2
Represents a recording signal in one or a plurality of fields or in frame units. Hereinafter, this is referred to as a unit image recording block.

In FIG. 26, i + 3 image recording blocks are continuously written in the moving image recording medium 7a during the still image processing period. At the time of reproduction, i + 3 blocks are continuously reproduced, but if the time is short, it does not matter so much.
FIG. 27 shows a state in which the moving image recording medium 7a is actually recorded on a consumer analog video tape. In this case, the unit image recording block is one field. The tape running is not interrupted even during the still image recording period.

FIG. 28 is a block diagram of a color image pickup and recording apparatus using another processing method for moving image processing during the still image processing period, and recording of the moving image processing system is temporarily stopped during the still image processing period. It was done. The recording signal to the moving image recording medium 7a is muted during the still image processing period as shown in FIG.

FIG. 30 shows a state of recording on a consumer analog video tape. I + 4 to i + in the still image processing period
Although the moving image data for the period up to 6 is missing, the reproduced image is not significantly disturbed. If this period is short, moving image dropouts can be kept within a range that is not a concern. During the still image processing period, the moving image recording signal is muted, and the tape running system must also be paused.

FIG. 31 shows the timing of transition from the moving image mode to the still image mode. j, j + 1, j + 2 ... Denote image signals in units of one field. In this example, the phase of reading from the image sensor 1 and the phase of writing to the moving image recording medium 7a are the same. When a still image shooting command is issued as shown in FIG. 31B, when the still image mode is entered after the field moving image signal being output from the image sensor 1 at that time is finished, moving image recording is performed. The connection is done smoothly. To return to the moving image mode, if the reading of the still image signal is completed, the setting for moving image capturing is returned, and at the same timing as switching to the moving image recording medium 7a,
Video connection is good. In this example, the moving image processing shown in FIG. 26 is used.

According to the example of FIG. 31, there is a time difference between the still image shooting command and the actual shooting. As shown in FIG. 32, when the system in which the moving image processing unit 51 delays between the reading from the image pickup device 1 and the recording on the moving image recording medium 7a, as soon as a still image shooting command is input, it is immediately performed. You can start shooting. In this example, recording on the moving image recording medium 7a is performed one field after the signal is read from the image sensor 1, and the moving image signal (j + 3 in the figure) read when a still image shooting command is input. Disable and immediately start shooting still images.

It is also possible to provide a reproducing function to the color image pickup recording apparatus shown in FIG. 20 so that a moving image / still image can be reproduced at the same time. For example, as shown in FIG. 33, reproduction signal processing units 54a and 54b are independently provided corresponding to the recording media 7a and 7b,
It is possible to perform processing such as selection of a reproduced image, partial incorporation in one image, and overlap such as fade-in / fade-out by the mixing switching circuit 55.

Further, as shown in FIG. 34, by providing the switching circuit 56 and providing a plurality of reproduction outputs, it is possible to simultaneously output a moving image and a still image. In FIG. 34, the video output is
Although there are two systems, both can be assigned to a moving image or a still image, or one system can be assigned to a moving image or a still image, or the output system can be exchanged. Switching of still images is performed by a switching command, but this command may be manually performed by the operator or may be automatically switched by incorporating a switching signal in the moving image recording medium 7a.

When a still image is picked up and recorded during moving image pick-up and recording, if the position where the still image is recorded is recorded in the moving image recording medium 7a, it is convenient for later retrieval. When moving images and still images are simultaneously reproduced, the signal of the still image may be automatically switched and output based on this position information.

FIG. 35 shows a still image recording medium 7b (see FIG. 20).
Now, an embodiment of a color image pickup recording device having a medium mounting detection circuit 59 for detecting the mounting state of the memory card 42) and a display 60 for displaying the mounting state of the still image recording medium 7b will be described. In this embodiment, when a medium non-mounting signal is received from the medium loading detection circuit 59 during still image shooting, a signal for instructing display to that effect is output to the display 60, and still image shooting is stopped.

When recording a still image during moving image recording,
When the output signal of the medium loading detection circuit 59 is checked, if the still image recording medium 7b is in the loaded state and is writable (the write protection is not made and the remaining capacity of the recording medium 7b is present), The still image shooting control circuit 58 is operated to start the still image shooting, the moving image shooting is temporarily interrupted or the pseudo moving image is inserted, and the still image data is recorded in the recording medium 7b. After that, recording of a normal moving image is continued again.

Regarding the method of recording moving images and still images, FIG.
The method described in 6 to 32 can be used. If the still image recording medium 7b is not attached or is not writable, the moving image is recorded as it is and the display unit 60
Then, a signal indicating that the medium is not mounted or the medium is not writable is output.

In FIG. 35, the recording medium 7 for moving images / still images is shown.
Although a and 7b are prepared separately, they can be recorded on the same recording medium 7. 36 and 37 are examples thereof. FIG. 36 shows a case where moving image data and still image data are recorded at the same position on the recording medium 7 using the dual-purpose recording circuit 62 in the same format. This is mainly the case when digital data recording is performed. Further, in the example of FIG. 36, the processing unit 51,
52 is switched and a discrimination signal of a moving image or a still image is added and recorded as digital data. During reproduction, the reproduction signal processing unit is switched according to the identification signal to reproduce a moving image or a still image.

When recording a still image during moving image recording, the data amount of one still image frame is compared with the data amount of one moving image frame, and the data amount of one still image frame is smaller than the data amount of one moving image frame. At this time, the recording of one moving image frame is interrupted, and still image data is recorded as one moving image frame instead. At this time, the still image recording identification data is recorded at the same time.

When the data amount of one still image frame is larger than the data amount of one moving image frame, the recording of the moving image is suspended and the still image data is recorded until the required data amount can be secured. At this time, still image identification data for necessary frames is added and recorded. The reproduction of the still image is performed by using this identification data as a clue. Further, when the still image area is hit during reproduction of the moving image, the moving image frame immediately before the still image may be reproduced again, or interpolation may be performed from the moving image frame before and after the still image area.

In the color image pickup recording apparatus shown in FIG. 37, the same recording medium 7 is used, but recording circuits 63 and 64 for moving images and still images are separately provided, and the recording medium 7 is used for moving images and still images. This is an example of recording by changing the above recording position or recording format.

36 and 37, a still image buffer memory 61 is provided as shown by a broken line, and still image data is temporarily stored in the buffer memory 61 instead of the recording medium 7 at the time of still image shooting. However, it may be used for converting the recording speed of the recording medium 7. That is, when the signal processing of the still image is slow, the data is accumulated in the buffer memory 61 and then recorded on the recording medium 7.

Further, the buffer memory 61 is effective even when the writing speed to the recording medium 7 is slow. It is also possible to record the still image data in the buffer memory 61 when the recording of the moving image is completed. Furthermore, when the recording medium 7 is taken out from the apparatus, the data in the buffer memory 61 can be transferred to the recording medium 7 and recorded.

Next, an embodiment of a color image recording and recording apparatus (electronic still camera) dedicated to a still image according to the present invention will be described. FIG. 38 is a circuit configuration diagram showing an embodiment thereof,
The color solid-state imaging device 71, the preamplifier 72, the A / D converter 73, the read-only memory (ROM) 74, the digital processing circuit 75, and the memory (recording medium) 76.

From the color solid-state image pickup device 71, first
The field imaging signal is read out, passed through the preamplifier 72, and then converted into a digital signal (hereinafter referred to as image data) by the A / D converter 73. This image data (Si) is input to the address input of the ROM 74.
In addition to this, field information (FI), shutter speed information (SP) and white balance information (WB)
It is input to the address input of the ROM 74.

Details of the ROM 74 will be described below with reference to FIG. Here, the color filter of the solid-state image pickup device 71 has a primary color (R, G, B) array, and the conversion bit number of the A / D converter 73 is 10 bits. The addresses of the ROM 74 are assigned as follows. A _{0 in the} image data (Si)
~ A ₉ (10 bits in total), A in field information (FI)
₁₀ (= 1 bit; first field "0", a second field "1"), A ₁₁ to A to the shutter speed information (SP)
₁₃ (= 3 bits; 8 kinds of shutter speeds supported. Shutter speed is SP = “000” = 1/32 as an example.
Second, "001" = 1/64 second, ... "111" = 1/40
96 seconds), A ₁₄ and A ₁₅ (= 2 bits;
"00" for R signal, "01" for G signal, "1" for B signal
0 "), and white balance information (W
A ₁₆ to B) (= 1 bit; If the lighting condition is daylight "
0 "and" 1 "in the case of indoor are assigned.
If the output of M74 is 8 bits, the capacity of ROM 74 is 1 megabit.

Assuming that the inter-field level difference is added to the signal of the second field by the amount depending on the shutter speed (SP), the inter-field correction is performed by the following relational expression. It can be performed.

Si ₂ ′ = Si ₂ −α (SP) · Si ₂ (12) where Si _{2 is} the signal before correction in the second field Si ₂ ′ is the signal after correction in the second field α (SP ) ・ Si ₂ : Second depending on shutter speed
Field offset amount Corrected second field signal Si ₂ ′ in equation (12)
Is shutter speed data (SP) and input signal Si
_Since it is a function with ₂ , it can be expressed as in the following equation (13). Si ₂ ′ = β (SP, Si ₂ ) ... (13) On the other hand, the white balance information (WB) is for switching between daylight and room, and an R signal, a G signal when a white subject is photographed in daylight, The ratio of the B signal is R _w0 : G _w0 : B _w0, and the ratio in the room is R _w1 : G _w1 : B _w1 .

First, how to prepare the table of the ROM 74 for daylight will be described. R _w0 : G _w0 :
The largest signal of B _w0 is _defined as M _w0, and this signal (M
The ratio of _w0 ) to _Rw0 , _Gw0 , _Bw0 is K _R0 , K _G0 , K _B0 .

Using these values and equation (13), the ROM 74
The relationship between the input signal Si and the output signal So of is expressed as follows.

(R signal of the first field) So (R1) = Γ {K _R0 · Si ₁ } (G signal of the first field) So (G1) = Γ {K _G0 · Si ₁ } (of the first field B signal) So (B1) = Γ {K _B0 · Si ₁ } (R signal of the second field) So (R2) = Γ {K _R0 · β (SP, Si ₂ } (G signal of the second field) So (G2) = Γ {K _G0 · β (SP, Si ₂ } (B signal of the second field) So (B2) = Γ {K _B0 · β (SP, Si ₂ } (14) where Γ {X} Is a function that performs gamma correction on the signal X (eg:
Γ {X} = X ^0.45 ) As can be seen from the above equation, if field information (FI; identification information of first field or second field), white balance information (WD) and shutter speed information (SP) are given. The signal So after gamma correction of the input signal Si is obtained from the table of the ROM 74. This output signal So is equivalent to the white balance correction, the gamma correction, and the inter-field level difference correction collectively performed. The same applies to the correction in the room.

FIG. 38 shows an example in which the ROM 74 has a table for each of the first field and the second field, but as shown in FIG. 39, the FI.SP.
You may input the data of WB and generate the selection data to ROM74.

The white balance correction in the above embodiment is limited to daylight and indoor two positions (ROM
Although the assignment of 74 to the address is 1 bit), a plurality of bits may be assigned to the white balance. One example thereof will be described with reference to FIG. As shown in FIG. 41, 6 bits are assigned to the white balance information (WB). First, how to obtain the white balance data (A _R , A _G , A _B ) input to the address input of the ROM 74 will be described. The white balance sensor, not shown, R signal (R _W) during white object imaging, determine the magnitude of the G signal (G _W) and B signals (B _w). If the largest signal among these is M _W , the white balance data (A _R , A _G , A _B ) can be obtained by the following equation (15).

A _R = (M _W / R _W ) -1 A _G = (M _W / G _W ) -1 A _B = (M _W / B _W ) -1 (15) For example, under certain illumination conditions, R _W : G _W : B _W = 5:
If it is 4: 3, A _R , A _G , A _{B in} that case
The value of is calculated from equation (15) as follows.

A _R = (5/5) -1 = 0 A _G = (5/4) -1 = 0.25 A _B = (5/3) -1 = 0.667 (16) Further, It is as follows when expressed in binary 6 bits. A _R = "000000" (= 0) A _G = "010000" (= 2 ⁴ = 16) A _B = "101010" (= 2 ⁵ +2 ³ +2 = 42) (17) These values are the white balance data. ROM74
Address input (6 bits). here,
Characteristic data for gamma-correcting the input signals Si (R), Si (G), and Si (B) is selected from the ROM 74 by the values of A _R , A _G , and A _B. Using this value, the relationship between the input signal Si and the output signal So can be obtained from the equation (14) and expressed as follows.

(R signal of the first field) So (R1) = Γ {(1 + A _R / 64) · Si ₁ } = Γ {(1.0) · Si ₁ } (G signal of the first field) So ( G1) = Γ {(1 + A _G / 64) · Si ₁ } = Γ {(1.25) · Si ₁ } (B signal of the first field) So (B1) = Γ {(1 + A _B / 64) · Si ₁ } = Γ {(1.656) · Si ₁ } (R signal of the second field) So (R2) = Γ {(1 + A _R / 64) · β (SP, Si ₂ )} = Γ {(1. 0) · β (SP, Si ₂ )} (G signal of the second field) So (G2) = Γ {(1 + A _G / 64) · β (SP, Si ₂ )} = Γ {(1.25) · _{β (SP, Si 2)}} ( second field of the B signal) So (B2) = Γ { (1 + a B / 64) · β (SP, Si 2)} = Γ {(1.656) · β SP, Si _2)} (18) The white balance data _{(A R, A G, A} B),
By switching the input signals Si (R), Si (G), and Si (B) with the switch 79, white balance correction, gamma correction, and inter-field level difference correction suitable for the respective signals can be collectively performed. ..

In the above embodiment, the case where the number of bits of the white balance data (WB) is 6 has been described, but the capacity of the ROM 74, the accuracy of white balance and the like can be set according to each system.

Further, in the embodiment, the case where the color filter of the solid-state image pickup device 71 is the primary color (R, G, B) has been described, but it is possible to realize not only the primary color but also the complementary color. Although the case where one ROM 74 is used has been described, it is also possible to use a plurality of ROMs 74. For example, as another embodiment in which three ROMs can be provided, one for each of the R signal, the G signal, and the B signal, a system in which white balance correction is performed in analog is conceivable. The white balance information is not used as information for selecting the correction characteristic, and the same configuration as that of the above embodiment can be realized. The relational expression between the input signal Si and the output signal So in that case is shown below.

(R signal of the first field) So (R1) = Γ {Si ₁ } (G signal of the first field) So (G1) = Γ {Si ₁ } (B signal of the first field) So (B1) ) = Γ {Si ₁ } (R signal of the second field) So (R2) = Γ {β (SP, Si ₂ )} (G signal of the second field) So (G2) = Γ {β (SP, Si) ₂ )} (B signal of the second field) So (B2) = Γ {β (SP, Si ₂ )} (19) As described above, the electronic still camera of the present invention can realize white balance correction in analog or digital. Furthermore, the color filter array of the solid-state imaging device 71 is not limited to the primary color array, but can be applied to all color filter arrays such as complementary color arrays.

[0104]

According to the color image pickup recording apparatus of the present invention,
Compared with conventional video cameras, you can obtain image quality comparable to normal movie recording, vertical resolution in still image recording mode,
Good image quality of color reproducibility and color S / N can be obtained. In the future, it is expected that a system for digitally recording a still image by using a semiconductor memory or the like in addition to the magnetic tape as an additional function of the video camera will be required, and further improvement in the image quality of the still image is required. The present invention is effective in such a system.

When the present invention is applied to an electronic still camera dedicated to still images, it is possible to construct a system that satisfies both field recording and frame recording images.

Further, according to the electronic still camera of the present invention, since the level difference correction between fields can be collectively processed by the digital processing together with the white balance correction and the gamma correction, the circuit scale is reduced and the correction is made smaller. It can be done accurately.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a color image pickup recording apparatus of the present invention.

FIG. 2 is a diagram showing a color filter array used in the present invention.

FIG. 3 is an explanatory diagram of a field storage operation in the color filter array shown in FIG.

FIG. 4 is an explanatory diagram of a frame accumulation operation in the color filter array shown in FIG.

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a block diagram showing another embodiment of the present invention.

FIG. 7 is a block diagram showing another embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration in the case where gamma correction is performed by digital processing in the color image pickup recording apparatus of the present invention.

FIG. 9 is a block diagram showing the other configuration of the color image capturing and recording apparatus of the present invention when gamma correction is performed by digital processing.

FIG. 10 is a block diagram showing a configuration example of a field storage processing circuit in the color image capturing and recording apparatus of the present invention.

FIG. 11 is a block diagram showing another configuration example of the field storage processing circuit in the color image capturing / recording apparatus of the present invention.

FIG. 12 is a block diagram showing a configuration example of a frame accumulation processing circuit in the color image capturing and recording apparatus of the present invention.

FIG. 13 is a block diagram showing another configuration example of the frame accumulation processing circuit in the color image capturing / recording apparatus of the present invention.

FIG. 14 is a block diagram showing a configuration example improved so as to reduce the amount of change in color reproducibility of the field storage processing circuit in the color image capturing and recording apparatus of the present invention.

FIG. 15 is a diagram showing various color filter arrays that can be used in the color image pickup recording apparatus of the present invention.

FIG. 16 is a diagram showing a color filter array of a color solid-state image sensor used in a conventional video camera.

FIG. 17 is a diagram showing a frame recording compatible color filter array that can be inferred from a field recording compatible color filter array employed in a conventional electronic still camera.

FIG. 18 is a diagram showing a color filter array of a solid-state imaging device suitable for field recording used in a conventional electronic still camera.

FIG. 19 is a diagram showing a color filter array suitable for field recording and frame recording adopted in a conventional electronic still camera.

FIG. 20 is a diagram showing an example of an external view of a color image pickup recording apparatus of the present invention.

FIG. 21 is a timing chart when performing still image capturing / recording during moving image capturing / recording by the color image capturing / recording apparatus of the present invention.

FIG. 22 is a flowchart when still image capturing / recording is performed during moving image capturing / recording by the color image capturing / recording apparatus of the present invention.

FIG. 23 is a block diagram of a portion for setting an input condition in a controller in the color image pickup recording apparatus of the present invention.

FIG. 24 is a diagram showing a drive circuit of an image pickup element in the color image pickup recording apparatus of the present invention.

FIG. 25 is a block diagram showing another embodiment of the color image pickup recording apparatus of the present invention.

FIG. 26 is a diagram showing a recording signal to a moving image recording medium when still image capturing / recording is performed during moving image capturing / recording by the apparatus of FIG. 25.

FIG. 27 is a diagram showing a state of recording on a consumer analog video tape when the consumer analog video tape is used as the moving picture recording medium of the embodiment.

FIG. 28 is a block diagram showing another embodiment of the color image pickup recording apparatus of the present invention.

FIG. 29 is a diagram showing recording signals to a moving image recording medium when still image capturing / recording is performed during moving image capturing / recording with the apparatus in FIG. 28.

FIG. 30 is a diagram showing a recording state on a consumer analog video tape when the consumer analog video tape is used as the moving picture recording medium of the embodiment.

FIG. 31 is a diagram showing an example of the timing of the output signal from the image sensor and the recording signal to the recording medium when the still image capturing / recording is performed during the moving image capturing / recording in the color image capturing / recording apparatus of the present invention.

FIG. 32 is a diagram showing another example of the timing of the output signal from the image sensor and the recording signal to the recording medium when the still image capturing / recording is performed during the moving image capturing / recording in the color image capturing / recording apparatus of the present invention.

FIG. 33 is a block diagram showing a configuration example of a reproduction processing section corresponding to the color image pickup recording apparatus of the present invention.

FIG. 34 is a block diagram showing another configuration example of the reproduction processing section corresponding to the color image pickup recording apparatus of the present invention.

FIG. 35 is a block diagram showing an embodiment of another aspect of the color image pickup recording apparatus of the present invention.

FIG. 36 is a block diagram showing an embodiment of another aspect of the color image pickup recording apparatus of the present invention.

FIG. 37 is a block diagram showing an embodiment of another aspect of the color image pickup recording apparatus of the present invention.

FIG. 38 is a block diagram showing an embodiment of the electronic still camera of the present invention.

FIG. 39 is a block diagram showing another embodiment of the electronic still camera of the present invention.

FIG. 40 is a block diagram showing a configuration example of a gamma correction circuit in the electronic still camera of the present invention.

FIG. 41 is a block diagram showing another configuration example of the gamma correction circuit in the electronic still camera of the present invention.

FIG. 42 is a block diagram of a conventional electronic still camera.

FIG. 43 is a diagram showing a schematic configuration of a solid-state image sensor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Color solid-state imaging device 2 ... Imaging device drive circuit 4 ... A / D converter 5 ... Field storage processing circuit 6 ... Frame storage processing circuit 7, 7a, 7b
Recording medium 71 Solid state image sensor 72 Preamplifier 74 A / D converter 74 ROM

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Ide 1 Komukai Toshiba-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Stock company Toshiba Research Institute

Claims (2)

[Claims] 1. A color solid-state image pickup device having a color filter, field accumulation processing means for subjecting an output signal from the color solid-state image pickup device to a field accumulation process at the time of recording a moving image to generate a color image signal, said color solid state image pickup device. A frame accumulation processing unit that generates a color image signal by performing frame accumulation processing on a signal output from the image pickup device when recording a still image; and a color image signal generated by the field accumulation processing unit and the frame accumulation processing unit is recorded. A color imaging recording apparatus comprising: a recording unit. 2. A color filter of the color solid-state image sensor,
The color filter elements of four rows and two columns are used as filter units, and these filter units are periodically arranged in the horizontal scanning direction and the vertical scanning direction orthogonal to the horizontal scanning direction. The color filter element is composed of a green filter element and a red or blue filter element whose horizontal scanning direction positions are set to be the same, and the color filter elements in the second and fourth rows are green whose horizontal scanning direction positions are reversed. The color image-capturing recording device according to claim 1, comprising a filter element and a blue or red filter element.