JPS623977Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a color imaging device using two solid-state imaging plates, and by making the vertical resolution of the signals obtained from the color signal imaging plates the same as the horizontal resolution, The purpose is to reduce the influence of optical and mechanical distortions and shifts between the two imaging plates.

Conventionally, the main adjustment method for registration in a color imaging device using a plurality of solid-state imaging plates is mechanical alignment of the solid-state imaging plates. A method using a variable delay element or the like has been proposed for the horizontal direction, but since the vertical direction remains unchanged, it has been difficult to correct complex distortions.

The present invention eliminates the above-mentioned drawbacks and will be described below along with its embodiments. FIG. 1 shows a light receiving section of a luminance signal imaging plate used in a color imaging device. In the figure, numerals 1, 2, 3, . . . are photodiodes, from which optical information stored in sequence can be read out by driving pulses.

Figure 2 shows the light receiving part of the color signal imaging plate, 1
1, 12, 13... are photodiodes.
These photodiodes 11, 12... are arranged vertically with R (red), G (green), and B as shown in the figure.
A (blue) striped filter is installed to spatially modulate colored light.

FIG. 3 shows the electrical configuration. In the figure, 21 is an objective lens, 22 is a half mirror for dividing input light into two, 23 is a solid-state image pickup plate for obtaining a luminance signal, 24 is a preamplifier, 25 is a low-pass filter, and 26 is a color signal. 27 is a solid-state image pickup plate for obtaining color signals. 28 is a preamplifier, 29 is a bandpass filter for extracting a modulated color signal, and 30 is a delay line 30 having a delay time corresponding to one horizontal scanning period.
a, a feedback circuit 30b, a comb filter having adders 30c and 30d, and 31 and 32, respectively, are detection circuits. 33 is a clock signal generator, 34 is an encoder, and 35 is an output terminal.

Next, the operation of this embodiment will be explained. The incident light passing through the objective lens 21 is divided into two by a half mirror 22.
It is divided into optical paths and images are formed on the light receiving surfaces of the luminance signal imaging plate 23 and the color signal imaging plate 27, respectively. As shown in FIGS. 1 and 2, these imaging plates 23 and 27 have the same number of elements, and the relationship between the stripe filter of the color signal imaging plate and the horizontal light receiving element is 1:1. It is not limited to this.
The signal obtained from the luminance signal imaging plate 23 is applied to a low-pass filter 25 via a preamplifier 24 to remove unnecessary components. The delay line 26 then applies the color signal and delay time together to the encoder 34 . Further, the signal obtained from the color signal imaging plate 27 is passed through a preamplifier 28 to a bandpass filter 29.
Only the modulated color signal spatially modulated by the stripe filter is taken out and applied to the feedback comb filter 30. The vertical resolution of this filter 30 decreases in proportion to the feedback amount K of the feedback circuit.
Therefore, even if there is a slight positional deviation in the vertical direction between the color signal image pickup plate 27 and the luminance signal image pickup plate 23, it can be made less noticeable by blurring the color signal in the vertical direction. .

In this way, the modulated color signal whose vertical resolution component is reduced to the same degree as the horizontal direction is output to the detection circuits 31 and 3.
Connect to 2.

Luminance signal imaging plate 23 and color signal imaging plate 2
7 is scanned by a clock signal from a clock signal generator 33. This clock signal is also used as a reference signal for the detection circuits 31 and 32 to perform synchronous detection to obtain R-Y and B-Y color difference signals. These color difference signals are sent to the encoder 3 together with the luminance signal.
4 is converted into a composite color signal and sent to output terminal 3.
Output from 5.

The resolution of the color signal in the horizontal direction is determined by the band of the band pass filter 29, but when the signal is passed through a low pass filter after detection, it is also related to the band of this low pass filter.

If the vertical resolution of the color signal is made to be the same as the horizontal resolution in this way, a time delay will occur in the color signal in the vertical direction, but this error is caused by the mechanical position of the luminance signal imaging plate 23 and the color signal imaging plate 27. This can be easily corrected by relatively shifting in the vertical direction.

As is clear from the above explanation, the present invention makes the vertical resolution of the color signal the same as the horizontal resolution, facilitates the installation accuracy of the two imaging plates, and improves the S/N of the color signal. It is. For this reason, in conventional color cameras that use multiple image pickup plates, it is difficult to match the registration, but if the vertical resolution of the color signal is set to the same level as the horizontal resolution, there is virtually no deterioration in image quality. Registration is easier and may require less mechanical precision. Further, by making the vertical resolution of the color signal comparable to the horizontal resolution, the S/N ratio can be improved, and the image quality can be improved. Also,
Optical systems that divide the optical path into multiple parts produce distortion due to wavelength, etc., but this error can also be absorbed.

[Brief explanation of the drawing]

1 and 2 are block diagrams of essential parts of a solid-state imaging plate, and FIG. 3 is a block diagram of a color imaging device according to an embodiment of the present invention. 23, 27... solid-state imaging plate, 30... comb filter.

Claims (1)

[Scope of utility model registration request] A solid-state imaging board for brightness signals, a solid-state imaging board for color signals having the same number of horizontal pixels as the solid-state imaging board for brightness signals, and a solid-state imaging board for color signals provided in front of the solid-state imaging board for color signals. and a means for applying the color signal taken out from the solid-state imaging plate for color signals to a feedback comb filter to lower the vertical resolution to the same level as the horizontal resolution. Characteristic color imaging device.