False contour correcting apparatus and method

Details False contour correcting apparatus and method False contour correcting apparatus and method

2007-04-24

2007-04-24

Natnael, Paulos (Department: 2622)

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

Reexamination Certificate

active

10616990

ABSTRACT:
A false contour correcting apparatus is capable of removing a false contour in an image based on a digital image signal while avoiding such a side effect caused by false contour correction where noises negatively effecting the display occur on a screen. Therefore, in the false contour correcting apparatus according, a double bit change detection circuit detects as a double bit change a signal value change which is twice a minimum quantization unit in a digital image signal, and outputs a double bit change detection signal representing the position of the double bit change. A signal correction circuit corrects the double bit change in the digital image signal into two one-bit changes on the basis of the double bit change detection signal. Consequently, a false contour corresponding to a portion where the double bit change exists is removed.

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