IMAGE COMPRESSION

摘要

An image compression unit for compressing image data (ID) having a plurality of pixels, each with one or more color samples, into a compressed format (CF) is provided. The image compression unit comprises a color lookup table generation unit (311) for generating a color lookup table having one or more colors and for transmitting the color lookup table in the compressed format (CF). The image compression unit further comprises a pixel mode determination unit (312) for determining for at least one pixel of the image data (ID) a pixel mode and for transmitting for the at least one pixel a pixel mode identifier for identifying the pixel mode in the compressed format (CF). A first pixel mode corresponds to the case that the at least one pixel matches one of the one or more colors in the color lookup table and a second pixel mode corresponds to the case that the at least one pixel does not match one of the one or more colors in the color lookup table. The image compression unit further comprises a color lookup table encoding unit (313) for encoding pixels whose pixel mode is the first pixel mode and a predictive encoding unit (314) for predictively encoding pixels whose pixel mode is the second pixel mode.