APPARATUS FOR PERFORMING LOSS-LESS COMPRESSION-CODING OF ADAPTIVE EVOLUTION TYPE ON IMAGE DATA

An image coding apparatus including a context generator configured to select a reference pixel that has been coded in image data to generate a context formed of the selected reference pixel, an entropy encoder configured to code the image data based on the context to generate coded data, an evaluation value calculator configured to calculating a compression ratio based on the image data and the coded data to output the compression ratio, and an adaptive evolution processor configured to perform adaptive evolution based on the compression ratio to find optimal reference pixels for the image data, the optimal reference pixels being supplied to the context generator for optimizing the context.