JPH0576015A - Two-plate type image pickup device - Google Patents

Abstract

PURPOSE:To obtain the (4:2:2) output of a luminance signal and a color difference signal by electing each RGB signal turned into an interpolation signal by adding weighting signal, and preparing an output signal. CONSTITUTION:This device is equipped with a delay circuit 1 which delays each signal of original color strings (RGB strings) inputted from the color sensor of an original color (RGB) stripe filter, weighting processing circuit 2 which operates a weighting coefficient to the delayed red(R) signal, green(G) signal, and blue(B) signal, adding circuit 3 which prepares the interpolation signal by adding the weighting signal at a certain time to it at the next time, and signal selecting circuit 4 which selects the R, G, and B signals prepared by the interpolation by a selective signal, and outputs them as the new signal string. Then, when the input signals of the RGB strings are inputted, the signal of each color holding the data by two cycles of the RGB signal columns is delayed. Thus, the data quantity of the signals from the sensor can be increased 1.5 times by the interpolating processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-plate type image pickup device which performs signal processing in the form of digital signals.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a schematic structure of a conventional multi-plate type image pickup device.

The subject light passes through the prism 6 and the color CCD
The light enters the sensor 14 and the brightness CCD sensor 14 '.
Color CCD sensor 14 and luminance CCD sensor 14 '
Is driven by a driver, and the CCD sensor for brightness 1
The luminance signal Y output from 4 ′ is the low-pass filter 1
It is input to the matrix circuit 17 via 6Y. In the matrix circuit 17, the R signal and B signal output from the color CCD sensor 14 and passed through the bandpass filters 16R and 16B are input, and the luminance signal Y causes the color signals R and B
Is matrix-subtracted to generate a G signal. These R,
The color difference signal R- from the G and B signals in the process circuit 18.
Y, BY are formed to form a low-frequency luminance signal, and the high-frequency luminance signal from the luminance CCD sensor 14 'through the bandpass filter 15 is added to this low-frequency luminance signal to obtain an NTSC luminance signal. Making.

A device related to this type is disclosed in, for example, Japanese Patent Laid-Open No. 62-104294.

[0005]

However, the above-mentioned prior art is analog signal processing, and the array of color sensors uses red and blue stripe filters. Therefore, there is a problem that color moire occurs in the field and the frame. In addition, red, green,
When the blue stripe filter is used, the digital standard 4:
There is a problem that 2: 2 output cannot be obtained.

An object of the present invention is to provide a two-plate type image pickup device which can obtain high resolution with little color moire.

[0007]

In order to achieve the above object, a means for delaying each signal of a primary color row (RGB row) input from a color sensor of a primary color (RGB) stripe filter, and the delayed red ( R) signal, green (G) signal, blue (B
Signal), a means for applying a weighting coefficient, a means for adding a signal at a certain time to which the weight is added and a signal at the next time, and an interpolation signal, and an R signal, G signal,
The B signal is selected by a selection signal and output as a new signal sequence.

[0008]

In the above technical means, the first technical means is that when the input signals of the RGB columns of FIG. 2 are input, the signals of the respective colors have two cycles of the RGB signal column like the signals from a to f of FIG. Minute data is retained and delayed. This is because, in order to output the luminance signal and the color difference signal at 4: 2: 2 in the final output, it is necessary to increase the data amount of the signal from the sensor by 1.5 times by the interpolation processing. The interpolation processing is to create data of an interpolation signal from two pieces of data of the same color at a certain time and a next time, and it is necessary to hold and delay the data of the signal in order to perform this processing. The second technical means applies a weighting coefficient to each of the delayed RGB signals as shown by g to l in FIG. This is to prevent the positional relationship between the position of each RGB data created by the interpolation processing and the original RGB output from the sensor from being lost. A third technical means is to add the weighted data of the same color to each other, whereby the data subjected to the interpolation processing as shown by m to o in FIG. 2 is created. A fourth technical means is RGB which has been subjected to the interpolation processing shown in m to o of FIG.
2 is selected and arranged in the signal sequence shown in the output signal of FIG.

By the above-mentioned technical means, the signal output from the color sensor becomes an interpolated signal, and as a result, the data amount of the signal output from the original sensor is 1.
It becomes 5 times, and the luminance signal and the color difference signal can be output at 4: 2: 2 at the final output of the signal processing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a block diagram showing the configuration of a circuit that performs signal interpolation processing, which is composed of a delay circuit 1, a weighting processing circuit 2, an addition circuit 3 and a signal selection circuit 4. The operation will be described below. Input the digital signal obtained by A / D conversion of the RGB column signal from the sensor from the input terminal,
Input to the delay circuit 1. The delay circuit has two systems for each RGB, and latches the data of the input signal and holds the data as shown in a to f of FIG. 2 at different timings. The data held by the delay circuit 1 is input to the weighting processing circuit 2. The input data is g in FIG.
The data is output as weighted data as shown from 1 to 1. The output data is weighted through another delay circuit 1 of the same color, and the output data is added to the output data by an adder circuit 3. The added data is supplied to the signal selection circuit 4. The supplied data is selected by the selection signal and is newly output to the output terminal in the arrangement as shown in the output signal of FIG. As a result, the data output from the original sensor becomes the data subjected to the interpolation processing.

According to this embodiment, since the structure is the same as that described above, there is an effect that the amount of data output from the original sensor can be increased by 1.5 times.

FIG. 3 shows an embodiment in which the present invention is applied to the camera section of a two-plate digital video camera. The input light is
The light enters the color sensor 7 of the RGB stripe filter and the brightness sensor 9 through the prism 5. Output signals from each sensor are CDS (correlated double sampling), AGC
(Automatic gain control) Analog processing such as 8 is performed, A / D
It is converted into a digital signal by the converter 10. In the color signal processing, data output from the color sensor and A / D converted is subjected to color signal data interpolation by the interpolation processing circuit 11 of the present invention, and the data amount is increased by 1.5 times. Is output. Then, the color difference digital signal is output through the color system digital signal processing circuit 12. On the other hand, in the brightness signal processing, the data output from the brightness sensor 9 and A / D converted is passed through the brightness digital signal processing circuit 13 to output a brightness digital signal. According to the present invention, 4: 2 of the luminance signal and the color difference signal which are digital signal processed:
It is possible to realize a two-plate type digital video camera device using an RGB stripe filter color sensor capable of obtaining two outputs.

[0013]

Since the present invention is constructed as described above, it has the following effects.

In a two-panel digital video camera using an RGB stripe filter color sensor and a luminance sensor, interpolation processing is performed in color signal processing to increase the amount of data from the sensor by a factor of 1.5. So
A luminance signal and a color difference signal of 4: 2: 2 can be obtained at the final output.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a configuration of a two-plate type video camera using the present invention.

FIG. 3 is a timing chart of each signal in the main part of FIG.

FIG. 4 is a block diagram showing an example of a conventional two-plate type imaging device.

[Explanation of symbols]

1 ... Delay circuit 2 ... Weighting processing circuit 3 ... Addition circuit 4 ... Signal selection circuit 5 ... Lens 6 ... Prism 7 ... Color sensor 8 ... CDS / AGC (correlated double sampling / automatic gain control) circuit 9 ... Luminance Sensor 10 ... A / D converter 11 ... Interpolation processing circuit 12 ... Color system digital signal processing circuit 13 ... Luminance system digital signal processing circuit 14 ... Sensor 15 ... Band pass filter 16 ... Low pass filter 17 ... Matrix circuit 18 ... Process circuit 19 ... Encoder 20 ... Adder circuit

Claims (1)

[Claims] 1. A means (1) for delaying an A / D converted digital signal of an RGB sequence from a color sensor in a two-plate digital color video camera with different timings for each of two R, G and B signals. And; each delayed RG
Means (2) for weighting the B signal; Means (3) for adding the signals obtained by applying the weighting coefficients to the RGB signals; and Signals for applying the coefficients to the RGB signals by the selection signal A signal selecting means (4) for selecting an added signal of the signal and creating an output signal sequence; and an interpolation processing circuit configured to increase the data amount of the input signal by 1.5 times A two-plate type image pickup device characterized in that a digital 4: 2: 2 output can be obtained.