Performance evaluation of motion estimation in DCT transform domain
Petrescu Catalin-Dumitru, Stefanoiu Dan, Ciprian Lupu · 2008
Abstract:- Motion estimation is one of the most important steps in video compression algorithms. It reduces temporal redundancy present in frame sequences and allows a better compression of video material. Most of the actual video compression algorithms use “block matching ” methods which operate on the bitmap form of the frames. This paper presents a method for computing the values of DCT coefficients of a block of pixels positioned on certain coordinates over four adjacent blocks using only the DCT coefficients of these four blocks. Performance of this method is analyzed for both integer and non-integer displacements. Also, an equivalent of the full-search algorithm translated in 2D-DCT domain is presented. Key-Words:- motion estimation, block matching, discrete cosine transform, video compression, match function 1