Picture coding method, picture decoding method, picture coding apparatus, picture decoding apparatus, and program thereof

摘要

A picture coding method of the present invention codes a picture signal and a ratio of a number of luminance pixels and a number of chrominance pixels for the picture signal, and then one coding method out of at least two coding methods is selected depending on the ratio. Next, data related to a picture size is coded in accordance with the selected coding method. The data related to the picture size indicates a size of the picture corresponding to the picture signal or an output area, which is a pixel area to be outputted in decoding in a whole pixel area coded in the picture signal coding.

主权项

1. A picture coding apparatus comprising:
a picture coding unit operable to code a picture signal; a ratio coding unit operable to code a ratio of a number of luminance pixels to a number of chrominance pixels for the picture signal; a selecting unit operable to select one coding method out of at least two coding methods, the one coding method being selected based on the ratio; and a data coding unit operable to code data related to a picture size in accordance with the selected coding method, wherein the data related to the picture size indicates a size of a picture corresponding to the picture signal, and wherein, when a ratio of a number of vertical luminance pixels to a number of vertical chrominance pixels is N:1, said selecting unit selects a coding method coding 1/N of a number of vertical pixels, the vertical luminance pixels and the vertical chrominance pixels being included in the picture signal.