Patent ID: 9030484
Filing Date: 2015-05-12
Classification: G09G

Abstract:
1. An image signal processing apparatus, comprising: a random producing unit which produces seed values for frames input for a predetermined period, by using a linear feedback shift register (LFSR); and a dithering processing unit which performs a dithering to input image signals by using the seed values produced by the random producing unit, wherein the seed values produced by the LFSR are used by the dithering processing unit to select mask matrices from a plurality of mask matrices, the dithering processing unit uses the selected mask matrices to perform the dithering to produce dithered image signals, the random producing unit comprises an initial value producing unit which produces an initial value of the LFSR which produces the seed values based on the initial value, and wherein the initial value producing unit continuously counts a number of frames input to the random producing unit from the input image signals, divides the number of frames by a predetermined period, and updates the initial value to produce a new initial value each time a remainder of the number of frames divided by the predetermined period is zero.