Patent ID: 7612831
Filing Date: 2009-11-03
Classification: H04N

Abstract:
1. A gamma correction device for outputting, as an m-bit signal, a digital input signal having been inputted as an n-bit signal, m being a given number, the gamma correction device comprising a first lookup table, a second lookup table, a third lookup table, a connector and an adder, wherein each of the lookup tables has input bits fewer than n and output bits fewer than m, the first lookup table has x-bit input and m1-bit output, the second lookup table has (n−t)-bit input and m2-bit output, the third lookup table has (n−t)-bit input and k-bit output, m≦m1+m2, x<n−t and m≧m1+k are established, the connector outputs connection data obtained by connecting output bits of the first lookup table on a high-order bit side and output bits of the third lookup table on a low-order bit side with m−m1−k bits of “0s” being interposed between the output bits, and the adder adds the connection data and an output value of the second lookup table and outputs the added data.