JPS59152789A - Color camera - Google Patents

Abstract

PURPOSE:To correct easily bleeding and to improve the accuracy of signal processing by providing a correcting device changing a group delay amount to any of a signal processing system extracting a chrominance signal and another signal processing extracting a luminance signal. CONSTITUTION:An image pick up signal is applied to a YL signal extracting filter 2 and a band pass filter 3 via a preamplifier 1. The output of the band pass filter 3 is applied to an encoder 9 via an R1B separating circuit 4, detectors 5, 6 and subtractors 7, 8, and a video output is obtained by adding a luminance signal to the encoder 9. A delay signal changing a delay time is given from a bleeding correcting device 10 to the subtraction circuits 7, 8 and the phase with an output of the detectors 5, 6 is adjusted, then pulsive residual components forming bleeding caused by the subtraction are eliminated.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a color camera.

Conventional configuration and its problems In the signal processing system of a single-tube frequency separation type color camera, a time difference occurs between the color signal processing system and the luminance signal processing system YL due to filter processing. The difference in delay time (group delay time) [hereinafter referred to as TD] was output as color blur in the image.

For this reason, in the past, the To of each signal was designed and used to match the TD, but a satisfactory image could not always be obtained due to variations in TD between each signal (filter).・Figure 3 shows this relationship, where 21 is the preamplifier output, and b is the preamplifier output a.
Y extracted through a filter that removes YL acid components.
L output, C is preamplifier output a, taken out through band pass filter, 1'/ after color separation and detection,
.

When outputting color, d is subtracted from C and r('-YB-YL, respectively.

OBJECTS OF THE INVENTION The present invention eliminates these drawbacks and makes it possible to easily correct color fringing.

Structure of the Invention The present invention includes a signal processing system that extracts an optically modulated I't/B signal using a bandpass filter in order to absorb variations between filters, and a low-pass filter that extracts a luminance signal component. A corrector is provided in one of the signal processing systems to vary the amount of group delay and match it to the other signal.

DESCRIPTION OF THE EMBODIMENTS Hereinafter, an explanation will be given of the embodiments shown in the drawings, taking as an example the case where the present invention is applied to a single-tube frequency separation system. In Figure 1,
1 is a preamplifier that amplifies the imaging output, 2 is Yl, a filter that extracts the signal, 3 is a bandpass filter, and 4 is R/
B separation circuit, 5.6 is a detector, 7.8 is a subtraction circuit, 9 is an encoder, 10 is an L transistor 81.82, a resistor 8
3 to 86, and a capacitor 87.

Here, A and A in FIG. 2 indicate the relationship between the input and output applied to the corrector 10, and by varying the capacitance of the capacitor 87, To can be varied.

FIG. 4 corresponds to FIG. 3, and shows that the phase of the output of the filler 2 can be arbitrarily adjusted (delayed) by the color fringing corrector 10. ′
and the output C of the wave detector 5.6 can be in the same phase, and when subtracted by the subtraction circuit 7.8, the output becomes d'. In other words, there is no pulse-like residue that causes color bleeding.

Effects of the Invention Although the embodiments have been described above, according to the present invention, color fringing can be easily corrected and signal processing accuracy can be improved.

Also, in terms of configuration, a circuit consisting of two transistors, one capacitor, and a few resistors is sufficient.

In the above embodiment, the hill was adjusted, but the output of the bandpass filter 3 or the electrical wiring diagram of the main part of the detection unit, and Figure 2 is the input/output waveform diagram of the color fringing corrector, which is a part of it. , FIG. 3 is an output waveform diagram of each part of a conventional color camera, and FIG. 4 is an output waveform diagram of each part of the camera shown in FIG. 1.

■...Preamplifier, 2...YL filter, 3...
Band pass filter, 4...R/n separation circuit, 5.6
...Detector, 7.8...Subtraction circuit, 9...Encoder, 10...Color fringing corrector.

Claims (1)

[Claims] A color camera that has a color fringing corrector installed in either one of the signal processing system, which consists of a signal processing system that uses a bandpass filter to extract optically modulated color signal components and a lowpass filter that extracts luminance signal components. .