Patent Number:
6,166,781
Title:
Non-linear characteristic correction apparatus and method therefor
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.
Inventors:
Kwak; Mal-seob (Kyungki-do, KR), Sunwoo; Jun (Seoul, KR), Hwang; In-jun (Seoul, KR), Kang; Bong-soon (Kyungki-do, KR)
Assignee:
Samsung Electronics Co., Ltd.
International Classification:
H04N 9/69 (20060101); H04N 1/401 (20060101); H04N 5/202 (20060101); H04N 1/407 (20060101); H04N 005/202 (); G03F 003/08 ()
Expiration Date:
12/26/2017