JPS59288A - Solid-state color image pickup device - Google Patents

Abstract

PURPOSE:To raise resolution and a utilizing rate of light, and to equalize an output signal of a filter position, by placing plural filter elements in accordance with each photodetector, and scanning simultaneously two pieces each of photodetectors adjacent in the vertical direction. CONSTITUTION:Two adjacent horizontal lines are scanned simultaneously by use of a filter which arrays in the horizontal direction a filter element train A obtained by placing alternately a yellow color transmission filter Ye and a cyan color transmission filter Cy, and filter element train B obtained by placing alternately an all-color transmission filter W and a magenta color transmission filter Mg. The filter element consists of a complementary color filter or an all-color transmission filter, therefore, a utilizing rate of light is high, and the balance of magnitude of a signal is improved in comparison with combination of a primary color transmission filter and the all-color transmission filter. Also, a signal of R+2G+B is obtained in an A train position, a signal of R+G+B is obtained in a B train position, and these signals are close to the ratio of a regular luminance signal, respectively, therefore, by adjusting the gain in each scanning position, a luminance signal is obtained at every picture element, and high resolution is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid-state color imaging device, and more particularly to a solid-state color imaging device using a single imaging plate.

In a solid-state color camera with a single image pickup plate, a plurality of light-receiving elements are formed both horizontally and vertically, and filter elements are arranged in a mosaic pattern at positions corresponding to each light-receiving element.
A filter arrangement that satisfies the following conditions is desired.

(1) High resolution.

(2) High light utilization rate.

(3) The magnitude of the output signal is approximately equal at each filter position.

An object of the present invention is to provide a solid-state color imaging device with a novel color filter arrangement that comprehensively satisfies the above three conditions.

In order to achieve the above object, the solid-state optical imaging device of the present invention has a filter element row A in which yellow color transmission filters Ye and cyan color transmission filters Cy are arranged alternately, as shown in FIG. Using a filter in which filter element rows B in which color transmission filters W and magenta color transmission filters Mg are arranged alternately are arranged in the horizontal direction, adjacent two
Two horizontal lines (1, 2, 2, 3, etc.) are scanned simultaneously.

According to the present invention, since the filter element is a complementary color filter or an all-color transmission filter, the light utilization rate of condition (2) is higher than that of the combination of a primary color transmission filter and an all-color transmission filter. 3) The balance of signal magnitude has been improved. In addition, by simultaneously scanning two light receiving elements, at the %A row position, Cy+Ye%, that is, R
A signal of +20+H is obtained, and a signal of Wl, that is, R+G+B, is obtained at the B column position. These signals are normal luminance signals Y=0.3 R+0.59G+0.11, respectively.
Since the ratio is close to that of B, by adjusting the gain of the output signal at each scanning position, a brightness signal can be obtained for each pixel, and the high resolution of condition (1) can be obtained.

Examples of the present invention will be described below.

FIG. 2 is a configuration diagram of the image pickup plate. In the figure, 41 is a horizontal scanning circuit, 42 is a vertical scanning circuit, 43 is an interlace switching circuit, 44 is an interlace control circuit, for example a flip-flop circuit, and 45 is an interlace control circuit. Horizontal readout switch, 4
8 is a vertical readout switch, and 49 is a light receiving element. For this configuration.

Output signals for odd-numbered rows are outputted to the output line 46, and output signals for even-numbered rows are outputted to the output line 47 for both odd and even fields.

The color filter shown in FIG. 1 is bonded to the surface of the image pickup plate so that each filter element overlaps each of the light receiving elements 49.

FIG. 3 shows a signal processing circuit that processes the detection signals appearing at the signal terminals 46 and 47 and outputs a luminance signal Y and color signals R and B. The input signal from terminals 46 and 47 is input to amplifier 31.
After being amplified by a and 31b, the switch circuits 32a and 32
b allows signals to be distributed in units of pixels. Therefore, the 4 wires after the switch have Ye and C corresponding to the filters, respectively.
The y, 'w and Mg signals are input alternately. The Ye multiplied signal and the cy multiplied signal are added by the addition circuit 34 to become R+20+B, which is input to the low-pass filter 50. On the other hand, the W signal obtained alternately with this is W=R+G+B and Ye+Cy
The value is smaller than . Therefore, the W signal is
After being amplified by /3, the signal is applied to the low-pass filter 50 via the adder circuit 35. The output of the low-pass filter 50 becomes a luminance signal Y.

On the other hand, the color signal is first subtracted by the Ye and Cy times signal subtraction circuit 36 to create R and -B signals, which are delayed by one pixel delay circuit 37, matched in phase with the Mg signal, and added to the Mg signal. Subtract. The R signal is output from the adder circuit 38.
Further, a B signal is obtained at the output of the subtraction circuit 39, and is outputted as an R signal and a B signal through low-pass filters 51 and 52, respectively.

Note that the number of output lines of the image pickup device may be increased and the switches 32a and 32b shown in FIG. 3 may be operated inside the image pickup plate shown in FIG. 2.

In addition, as a one-color filter arrangement, two color filters are arranged as shown in FIG.
The positional relationship of the filter elements may be reversed vertically for each pixel. In this way, it is possible to reduce resolution deterioration in the R and B vertical directions. The output signal processing circuit in this case can be realized by only slightly modifying the signal processing circuit shown in FIG.

[Brief explanation of drawings]

FIG. 1 is a diagram showing one embodiment of the filter used in the solid-state color imaging device of the present invention, FIG. 2 is a diagram showing one embodiment of the image pickup plate, and FIG. 3 is a diagram showing one embodiment of the signal processing circuit. , 4th
The figure shows another embodiment of the filter.

Claims (1)

[Claims] 1. Simultaneously scan a plurality of light receiving elements arranged in the horizontal and vertical directions, a plurality of filter elements arranged corresponding to each of the light receiving elements, and two vertically adjacent light receiving elements, respectively. signals to separate output lines, and any two adjacent columns of the filter elements are arranged in such a manner that yellow color transmission filter elements and cyan color transmission filter elements are alternately arranged on one side, and all colors are arranged on the other side. A solid-state color imaging device characterized in that the solid-state color imaging device is arranged alternately with transmission filter elements.