Non-linear characteristic correction apparatus and method theref

Details Non-linear characteristic correction apparatus and method theref Non-linear characteristic correction apparatus and method theref

1997-10-03

2000-12-26

Peng, John K.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348674, 348676, 348677, 348254, 358519, 358518, 358521, 358522, H04N 5202, G03F 308

Patent

active

061667811

ABSTRACT:
A non-linear response correction apparatus and method reduce look up table size and output error. In one embodiment, a range of an N-bit input signal is split into two or more sectors, based on a gradient of a non-linear correction curve and an allowable error, and then a N-bit input signal is divided into U upper bits and D lower bits where U and D depend on which sector contains the input signal. First and second look up tables read first and second data stored therein, respectively, using the upper bits of the digital signal as an address. The first data is the difference between a corrected signal and the input signal, and the second data is the gradient of the corrected signal with respect to the gradient of the input signal. The second data read from the second look up table is multiplied by the lower bits, and the first data read from the first look up table is added to the upper bits. The sum is added to the product to produce an N-bit digital corrected signal that compensates for the non-linear characteristics.

REFERENCES:
patent: 5065234 (1991-11-01), Hung et al.
patent: 5175621 (1992-12-01), Maesato
patent: 5196924 (1993-03-01), Lumelsky et al.
patent: 5282036 (1994-01-01), Worley, Jr. et al.
patent: 5398076 (1995-03-01), Lum et al.
patent: 5408267 (1995-04-01), Main
patent: 5706058 (1998-01-01), Okada
Japanese Patent Publication No. JP 6-233131; Asano Masanari (Inventor); Gamma Correction for Digital Image; Fuji Film Micro Device KK; 9 pages.
Japanese Patent Publication No. JP 8214191; Suzuki Susumu (Inventor); Nonlinear Processing Circuit; Fujitsu General Ltd.; 8 pages.

Affiliated with

Also associated with

Rating

Non-linear characteristic correction apparatus and method theref does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Non-linear characteristic correction apparatus and method theref, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-linear characteristic correction apparatus and method theref will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1000872