JPH02113468U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an image quality correction circuit according to an embodiment of the present invention, Fig. 2 is an explanatory diagram explaining the frequency characteristics of each part of the circuit in Fig. 1, and Fig. 3 is a block diagram showing a conventional image quality correction circuit. Figure 4 is a signal waveform diagram of each part of the circuit in Figure 3, Figure 5 is an explanatory diagram explaining the delay line gain and delay time frequency characteristics in Figure 3, and Figure 6 is the image quality of Figure 3. FIG. 3 is an explanatory diagram illustrating frequency characteristics of a correction circuit. 1...Input terminal, 2, 3...Delay line,
4, 6, 7... Weighting circuit, 5, 9... Addition circuit, 8... Subtraction circuit, 10... Output terminal.

Claims (1)

[Claims for Utility Model Registration] A first delay circuit that delays a video signal supplied as an input by a predetermined amount; a second delay circuit that delays a video signal from the first delay circuit by a predetermined amount; 1. A low-pass filter that has a band characteristic equivalent to that of the second delay circuit and that passes the video signal supplied as the input, and a video signal that has passed through this low-pass filter and the a first addition circuit that adds the video signal from the second delay circuit; and a first addition circuit that adds the video signal from the second delay circuit;
/2; a subtraction circuit for subtracting the signal from the weighting means from the video signal from the first delay circuit to obtain a second-order differential signal; a second-order differential signal from the subtraction circuit; An image quality correction circuit comprising: a second addition circuit that adds video signals from the first delay circuit to obtain a contour-corrected video signal.