Dynamic range expanding apparatus of a video image

Details Dynamic range expanding apparatus of a video image Dynamic range expanding apparatus of a video image

1997-10-10

1999-09-28

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Gray scale transformation

348672, 348679, 348687, 348222, H04N 552, H04N 557

Patent

active

059596961

ABSTRACT:
The present invention relates to a dynamic range expanding apparatus. The dynamic range expanding apparatus realizes a wide dynamic range for a video image while reducing the quantization noise, by determining the brightness transform function based on the combined results of the differential and the integral operation with respect to a brightness distribution function. Moreover, the dynamic range expanding apparatus transforms the color difference signal by using the brightness transform ratio without losing the valance in a color tone.

REFERENCES:
patent: 5144442 (1992-09-01), Ginosar
patent: 5496106 (1996-03-01), Anderson

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