Video Block Motion Estimation Based on Walsh-Hadamard Projection Kernels

In modern video coders, motion is estimated using an algorithm that calculates the distance and direction of motion on a block-by-block basis. In this paper, a new motion estimation scheme is proposed. This scheme uses the sum of absolute difference between the Walsh-Hadamard projections of two blocks as measurement. And integral image is used to perform the scheme. Different from other methodologies using WH projections, the method proposed in this paper does not require iteration over every position to effectively calculate the WH projections of a block at any location. And the complexity of this scheme is regardless of the size (2N×2N) of the block. Comparing to the methods (Full Search, Three Step Search and Diamond Search) based on sum of absolute differences (SAD), experiments show that the proposed scheme significantly reduces computational complexity with little increase in the bit-rate.