MÉTODO DE CODIFICAÇÃO E MÉTODO DE DECODIFICAÇÃO DE VÍDEO, APARELHOS PARA OS MESMOS, PROGRAMAS PARA OS MESMOS, E MEIOS DE ARMAZENAMENTO PARA GRAVAÇÃO DOS PROGRAMAS

摘要

A video encoding method, in which a video signal consisting of two or more signal elements is targeted to be encoded, includes a step of setting a downsampling ratio is set for a specific signal element in a frame, in accordance with the characteristics in the frame; and a step of generating a target video signal to be encoded, by subjecting the specific signal element in the frame to downsampling in accordance with the set downsampling ratio. The frame may be divided into partial areas in accordance with localized characteristics in the frame; and a downsampling ratio for a specific signal element in these partial areas may be set in accordance with the characteristics in each partial area.