Video signal correction apparatus which detects leading and trai

Details Video signal correction apparatus which detects leading and trai Video signal correction apparatus which detects leading and trai

1993-10-08

1995-05-23

Groody, James J.

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348253, 348629, H04N 5208, H04N 968

Patent

active

054185742

ABSTRACT:
A video signal correction apparatus has a memory for storing a luminance value and color difference values for each pixel in an image, a horizontal color difference correction arrangement and a vertical color difference correction arrangement. The horizontal color difference correction arrangement includes a luminance change point detector for detecting leading and trailing edges, in which an area defined between the leading and trailing edges is a boundary between two colors. The colors in a region outside the boundary and adjacent to the edges are bleeding. The color difference values further outside the bleeding region are sampled to make reference color difference value. The reference color difference value is used for replacing the color difference values in the bleeding region to eliminate or reduce the bleeding color.

REFERENCES:
patent: 5124787 (1992-06-01), Lee et al.
English Language abstract of Japanese Laid-Open Patent No. 2-213282.

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