| 摘要 |
A method for encoding mode signals of a target block of MxN pixels having a binary value '0' or '255' is provided. If the target block is determined as neither "all-0" nor "all-255", either a frame-based coding or a field-based coding is selected to generate a coding mode signal, wherein the frame-based coding represents the target block is encoded on an MxN pixels basis and the field-based coding represents the target block is encoded on an M/2xN pixels basis, and a base mode of the target block based on the "all-0", "all-255" and/or the coding mode signal. If the frame-based coding is selected, a frame mode is generated. On the contrary, if the field-based coding is selected, the frame is divided into a top and a bottom fields so that a top mode for the top field and a modified bottom mode for the bottom field are obtained, wherein a bottom mode is modified by the top mode to be the modified bottom; and the top mode and the modified bottom mode are attached to be a field mode.
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