Patent ID: 7916782

Claim:
A picture decoding method comprising: decoding, using a processor, a coded picture signal; decoding a ratio of a number of luminance pixels to a number of the chrominance pixels for the decoded picture signal; selecting one decoding method out of at least two decoding methods, the one decoding method being selected based on the ratio; and decoding data related to a picture size in accordance with the selected decoding method, wherein the data related to the picture size indicates a size of a picture corresponding to the decoded picture signal, and wherein, when a ratio of a number of horizontal luminance pixels to a number of horizontal chrominance pixels is M:1, said selecting selects a decoding method where a parameter value of a horizontal size included in the decoded data related to the picture size is multiplied by M, the horizontal luminance pixels and the horizontal chrominance pixels being included in the decoded picture signal.