Patent ID: 9589514
Date: 2017-03-07
CPC Classifications: G09G,H04N

Claim:
1. A method for data compression in a digital image projection system, comprising: receiving signals containing image data at a digital controller, which is coupled to a spatial light modulator by a data interface, wherein the spatial light modulator comprises a two dimensional array of pixels; processing the image data to form frame images, and storing the frame images in a frame buffer coupled to the digital controller; using frame images retrieved from the frame buffer, forming bit plane images corresponding to a sequence of bit planes to be displayed by the spatial light modulator during an image display time; selecting a line of bits from a selected one of the bit plane images for transmission to the spatial light modulator over the data interface; comparing the selected line of bits to a previously transmitted line of bits, and if there is a match, moving to another line of bits for transmission to the spatial light modulator; if there is no match in the comparing, partitioning the selected line of bits into a plurality of line segments for transmission over the data interface to the spatial light modulator; determining per line segment, for at least first and second ones of the line segments, whether data compression is possible; responsive to the determining indicating data compression is possible, transmitting an encoded message to the spatial light modulator indicating a compressed data type is to be used for a selected line segment; and responsive to the determining indicating no data compression is possible, transmitting unencoded bits corresponding to the selected line segment to the spatial light modulator.