Method and system for broadcasting multimedia data

The present invention provides a method for adaptively selecting an optimal pixel block in an image frame. The method includes the activity of selecting an optimal block size for rapid and accurate motion estimation. The secondary block is extended into an overlapped region to form an expanded pixel block. Statistical region information about the non-overlapped region and the overlapped region of the respective extended pixel block is then measured. The optimal block, whether the standard (or smaller size) non-overlapped block or boundary expanded overlap block, is then selected in response to the measured statistical region infomation.