Patent ID: 8649442

Claim:
A decoding method for decoding received input image compression information, the method comprising: generating a context model corresponding to motion vector information of a current macroblock, wherein the context model is generated based on a sum of absolute values of motion vector information of macroblocks neighboring the current macroblock, and when the current macroblock is subjected to the frame-based encoding and a neighboring macroblock is subjected to field-based encoding, calculating the motion vector information corresponding to the neighboring macroblock by converting a vertical component of the motion vector information corresponding to the neighboring macroblock to an equivalent for frame-based encoding, and applying the motion vector information corresponding to the neighboring macroblock to the context model corresponding to the motion vector information of the current macroblock; and decoding the input image compression information using the context model corresponding to the syntax element for carrying out the frame-based or the field-based encoding.