JPS62159591A - Color solid-state image pickup device - Google Patents

Abstract

PURPOSE:To eliminate an unbalance in horizontal and vertical resolution and to form a color camera with high resolution by providing a color filter for disposing the first color filter in a dice pattern, disposing the second color filter on an odd number line in a Y direction and disposing the third color filter on an even number line in the Y direction. CONSTITUTION:The color filter G is disposed in the dice pattern and the color filter R is disposed on the odd number line and the color filter B is disposed on the even number line. Since a G signal giving a large influence to the resolution is obtained once for two picture elements, the resolution equivalent to that the number of horizontal picture elements is reduced to 1/2 is obtained, the horizontal and vertical balance in the resolution is obtained and a smooth video is obtained. Similarly, on R, B signals, a color picture having the good balance wholly without the video having the horizontal resolution lowered is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color camera using a solid-state image sensor.

In , the configuration of the color filters is such that the first color filters are arranged in a checkerboard pattern, the second color filters are arranged in odd numbered columns in the Y direction, and the third color filters are arranged in even numbered columns in the Y direction. , which allows high resolution to be obtained.

[Prior art]

A color filter of a conventional color camera is shown in FIG.

With R (red), G (green), and B (blue) stripe filters,
Each filter has the width of each pixel of the solid-state image sensor, and filters of the same color are repeatedly arranged in the X direction every three pixels. FIG. 3 shows a signal (color signal) obtained from a color camera using this color filter.

(1) is the R@ signal, (2) is the G signal, and (3) is the B signal.As can be seen from the configuration of the color filter, R, G, B
Each color signal is not a continuous signal, but can only be obtained in a discrete, sampled form. Let us now consider the horizontal (X direction) resolution. Since the G signal greatly affects the resolution, the number of horizontal pixels of the solid-state image sensor is reduced to 1 from the G signal alone.
It can be seen that only the resolution equivalent to that reduced to / is obtained. Further, since the G signal is obtained for each row, it can be seen that the vertical resolution (in the Y direction) is determined according to the number of vertical pixels of the solid-state image sensor.

[Problem that the invention seeks to solve]

However, the above-mentioned conventional technology has the problem that sufficient horizontal resolution cannot be obtained and that there is an imbalance in horizontal and vertical resolution. SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to eliminate the imbalance in horizontal and vertical resolution and provide a color camera with high resolution.

[Means to solve the problem]

The color solid-state imaging device of the present invention uses a solid-state imaging device in which photosensitive elements are arranged in the X and Y directions, in which the first color filter is arranged in a checkered pattern and the second color filter is arranged in the Y direction. 2. Equipped with color filters arranged in odd numbered columns and a third color filter arranged in even numbered columns in the Y direction.
Features.

[Operation] According to the above configuration of the present invention, the horizontal and vertical resolution is balanced by arranging the first color filters in a checkered pattern, and the insufficient color signal is replaced by one horizontal scanning time delay circuit (IH). A color video signal is obtained by supplementing the signal with a delay circuit (delay circuit).

〔Example〕

FIG. 1 shows a color filter in an embodiment of the present invention.

G color filters are arranged in a checkerboard pattern, R color filters are arranged in odd numbered columns, and B color filters are arranged in even numbered columns. FIG. 4 shows a color solid-state imaging device using this color filter. In the figure, 1 is a color solid-state image sensor;
2 is an amplifier, 3 is a 1H delay circuit, 4, 5, 6 is a switch, and 7° 8.9 is a G, B, R color signal output terminal.

The signal from the color solid-state imaging probe 1 is amplified by an amplifier 2. FIG. 3 shows signals when odd-numbered columns of the color solid-state image sensor 1 are scanned. Since there are only R and G color filters in the odd-numbered columns, as shown in the figure, the R signal is transmitted as shown in (1), and the G signal is transmitted once every two pixels, as shown in (2). is obtained. On the other hand, FIG. 6 shows signals when even-numbered columns of the color solid-state image sensor 1 are scanned. As in the case of odd numbered columns, G and B signals are obtained as in (2) IC5. In this way, since RGB signals cannot be obtained at the same time, the missing color signal must be replaced by one column in order to obtain the signal from the previous column.
The signal via the H delay line 5 can be obtained by switching the switch 5.6. This is shown in Figure 6 (1
) is indicated by the dashed line.

In the manner described above, RGB signals are obtained.

〔Effect of the invention〕

As described above, according to the invention, the G signal, which greatly affects the resolution, is obtained once every two pixels, so a resolution equivalent to reducing the number of horizontal pixels of a solid-state image sensor by 2 can be obtained. It will be done. Similarly, the vertical resolution is 1/2 the number of pixels.
It is possible to obtain a resolution equivalent to that in the horizontal and vertical directions, and for the R and E signals, an overall well-balanced color image is obtained, rather than an image with reduced resolution only in the horizontal direction. It has the effect of being

In addition, in the above explanation, RGB is used as a color filter.
have been used, but W (white, transparent), Cy (cyan, Y
It is clear that the same effect can be obtained by using θ (yellow).

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a color filter according to the present invention. FIG. 2 is a diagram showing a configuration of a color filter according to the prior art. FIG. 3 is a waveform diagram of a color signal obtained by the prior art. Chart FIG. 3 shows color signals in odd-numbered columns of the color solid-state imaging device according to the present invention. FIG. 6 shows color signals and final color signals in even-numbered columns of the color solid-state imaging device according to the present invention. 3...1H delay circuit 4,5.6...Switch and above Applicant Seiko Epson Co., Ltd. Agent Representative Patent Attorney (1 other person) ・- Color filter constituent countries Figure 1 Direction U-Komao F Chest 6t7 Flow Do Mart Figure 4 - H Yago t - H Nashi et al. Sales figure Figure 155

Claims (1)

[Claims] (1) a) In a solid-state imaging device using a solid-state imaging device in which photosensitive elements are arranged in the X and Y directions, b) a first color filter is arranged in a checkered pattern, and c) a second color filter is arranged in a checkered pattern.
d) a third color filter arranged in an even numbered row in the Y direction; and d) a third color filter arranged in an even numbered row in the Y direction.