METHOD FOR DECODING VIDEO

摘要

PROBLEM TO BE SOLVED: To provide a method and apparatus for efficiently decoding effective conversion coefficient information in a large-sized conversion residual block.SOLUTION: The method for decoding a video includes: a step 2210 of extracting an effective coefficient flag indicating whether or not an effective conversion coefficient exists, for each predetermined frequency band unit obtained by dividing a conversion residual block of a current block, from an encoded bit stream; a step 2220 of dividing the conversion residual block into the predetermined frequency band units; and a step 2230 of determining a frequency band unit in which the effective conversion coefficient exists, among the frequency band units obtained by dividing the conversion residual block, by utilizing the effective coefficient flag.