Image encoding device, image encoding method, image encoding program, image decoding device, image decoding method, and image decoding program

摘要

An image encoding device that uses intra-prediction to encode image signals containing a luminance signal and a color-difference signal in block units, and that encodes information pertaining to an intra-prediction mode in block units. When the pixel aspect ratios of the luminance signal and the color-difference signal differ an encoded stream generation unit (113) derives a second intra-color-difference prediction mode (which is used when the aspect ratios differ), wherein the mode numbers for a first intra-color-difference prediction mode (which is used when the aspect ratios are identical) are converted to scaled mode numbers.