Patent ID: 7711046

Claim:
An encoding circuit, comprising: a first Hadamard transform circuit for performing Hadamard transform on a block having “m” dots×“n” lines in a first frame; a second Hadamard transform circuit for performing Hadamard transform on a corresponding block having “m” dots×“n” lines in a subsequent second frame; means for calculating a sum component and a difference component for each component of a Hadamard transform result of the block in the first frame and a Hadamard transform result of the block in the second frame corresponding to the block in the first frame to perform three-dimensional Hadamard transform; motion detecting means for detecting whether or not the block includes a motion; and means for encoding the sum component and the difference component for the block when it is determined that the block includes a motion, and for encoding a motion detection result, instead of encoding the difference component, for the block determined when it is determined that the block includes no motion.