1. A method for detecting block artifacts, comprising: identifying a plurality of overlapping blocks in a picture from a sequence of moving video pictures with respect to a current block, where said plurality of overlapping blocks covers a portion of the current block and a portion of an adjacent block; transforming said at least one of the plurality of overlapping blocks into respective coefficients corresponding to at least one of a luminance component and a chrominance component; and identifying a block artifact for the at least one of the plurality of overlapping blocks when said respective coefficients corresponding to the at least one of the plurality of overlapping blocks are larger than a value.