KR950026173A - Contour Compensation Noise Reduction Circuit and Method - Google Patents

Abstract

The present invention relates to a contour compensation noise reduction circuit of an image processing system, and more particularly, to a contour compensation noise reduction circuit for removing noise such that a signal of the contour portion is not attenuated when noise included in an image signal is removed. In order to solve the problem that the signal of the contour part is also attenuated when the noise included in the video signal is removed, the high frequency component is removed by low-pass filtering to compensate for the problem that the clarity of the reproduction quality is reduced, and the contour part of the video signal from which the high frequency component is removed is compensated. In addition, the contour-compensated video signal is subtracted from the video signal, and noise of the contour-compensated video signal is attenuated to generate an image signal with a sharp outline, thereby improving the picture quality.

Description

Contour Compensation Noise Reduction Circuit and Method

Since this is an open matter, no full text was included.

3 is a contour compensation noise reduction circuit diagram according to the present invention;

4 is a angular floating waveform diagram of FIG. 3 according to the present invention;

Claims (5)

In the contour compensation noise reduction circuit of an image processing system, contour compensating means for inputting a video signal to remove a high frequency component and outputting it, and emphasizing and outputting a contour portion of the video signal from which the high frequency component has been removed from the high frequency component removing means. Noise compensating means for attenuating and outputting noise components of the video signal contour-compensated from the contour compensating means, contour image compensating means, and video signals subtracted from the noise compensating means and subtracted from the subtractor. A contour compensation noise reduction circuit comprising an adder for adding a video signal and outputting a video signal in which noise is controlled by adding a contour portion. 2. The contour compensator according to claim 1, wherein the contour compensating means comprises: a third delay 21 for delaying and outputting a video signal from which the high frequency component has been removed from the high frequency component removing means and a delay from the third delay 21; A fourth delayer 22 for delaying the outputted video signal again for a predetermined time and outputting the video signal from which the high-pass component is removed from the low pass filter 10 and a video signal delayed for a predetermined delay from the fourth delayer 22; An adder 23 for adding and outputting a subtractor, a subtractor 24 for subtracting and outputting a signal added from the adder 23 and a predetermined delayed video signal from the third delayer 21, and the trimmer 24. And an adder (25) which adds and outputs the video signal subtracted and outputted from the third delayer (21). In the contour compensation noise reduction circuit of an image processing system, a low pass filter (10) for inputting a video signal to remove a high pass component and outputting a high pass component, and an outline portion for a video signal from which the high pass component has been removed from the low pass filter (10) The contour compensator 20 outputs the video signal by highlighting it, the first delay unit 30 outputting the video signal by a predetermined delay, the image signal delayed by the first delay unit 30 and the contour compensator ( A subtractor 40 for subtracting and outputting the video signal contour-compensated from 20, a noise attenuator 50 for attenuating and outputting a noise component of the video signal contour-compensated from the contour compensator 20, and the subtractor The second delay unit 60 for delaying and outputting the video signal subtracted and output from the 40 and the video signal for which the noise is attenuated from the noise attenuator 50 are delayed from the second delayer 60. By adding the video signal Contour compensation circuit for noise reduction, characterized in that's is composed of an adder 70 which outputs the i video signal. The third delay unit 21 of claim 3, wherein the contour compensator 20 delays and outputs a video signal from which the high-pass component is removed from the low pass filter 10, and the third delay unit (4). And a fourth delayer 22 for delaying and outputting the video signal delayed from 21 to a predetermined time, and from the fourth delayer 22 of the video signal from which the high frequency component is removed from the low pass filter 10. An adder 23 for adding and outputting a predetermined delayed video signal, a subtractor 24 for subtracting and outputting a signal added from the adder 23 and a predetermined delayed video signal from the third delayer 21, and And an adder (25) which adds and outputs the video signal subtracted and output from the subtractor (24) and the video signal delayed by the third delay (21). In the contour compensation noise reduction method of an image processing system, a high frequency component removing process for removing high frequency components by low pass filtering of an image signal, and a contour compensating process for emphasizing the contour portion of the image signal from which high frequency components are removed in the high frequency component removing process And a subtraction step of subtracting the contour-compensated video signal from the video signal, a noise attenuation process for attenuating noise components of the contour-compensated video signal in the contour compensation process, and an image in which noise is attenuated in the noise attenuation process. And a video signal generating step of generating a video signal with a sharpened outline by adding a signal and a video signal subtracted in the subtraction process. ※ Note: The disclosure is based on the initial application.