CPC H04N 19/182 (2014.11) [H04N 19/167 (2014.11); H04N 19/176 (2014.11); H04N 19/65 (2014.11)] | 20 Claims |
1. An image compression method comprising:
receiving pixel values of a target pixel group to be compressed in image data and reference values of reference pixels to be used for compression of the target pixel group;
generating a virtual reference map by applying an offset value to each of the reference values;
compressing the pixel values of the target pixel group based on the virtual reference map; and
generating a bitstream based on a compression result and compression information based on the virtual reference map,
wherein the compressing of the pixel values includes calculating a first difference value between a compensated reference value included in the virtual reference map and a first value of at least once of the pixel values, and calculating a second difference value between the first value and another of the pixel values.
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