Patent ID: 9445106
Filing Date: 2016-09-13
CPC Classification: H04N

Claim Text:
1. A picture decoding apparatus comprising: a picture decoding unit operable to decode a coded picture signal; a ratio decoding unit operable to decode the ratio of the number of luminance pixels to the number of chrominance pixels for the decoded picture signal; a selecting unit operable to select one decoding method out of at least two decoding methods, the one decoding method being selected based on the ratio; and a data decoding unit operable to decode data related to the 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, wherein, when the ratio of the number of horizontal luminance pixels to the number of horizontal chrominance pixels is M:1, said selecting unit of said picture decoding apparatus 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, and wherein, when the ratio of the number of vertical luminance pixels to the number of vertical chrominance pixels is N:1, said selecting unit of said picture decoding apparatus selects a decoding method where a parameter value of a vertical size included in the decoded data related to the picture size is multiplied by N, the vertical luminance pixels and the vertical chrominance pixels being included in the decoded picture signal.