Work place: The Electrical Engineering Department of National Engineering School of Tunis TUNISIA
Research Interests: Image Processing, Image Manipulation, Image Compression, Computer Architecture and Organization
Dr. Wissal Hassen, received a Ph.D. degree in 2012 from the National Engineering High School of Tunisia, a master degree in Automatic and Signal Processing in 2006 from the same High School and a Bachelor‟s degree in Computer Science from Faculty of Sciences of Tunis in 2004. She is a member of Signal, Image and Information Technologies laboratory in the National Engineering High School of Tunisia. Her research activities include Signal Processing, Image Processing, Image and Video coding, Wavelet Transform and its applications.
DOI: https://doi.org/10.5815/ijigsp.2015.08.08, Pub. Date: 8 Jul. 2015
The purpose of this paper is to encode a color video by wavelet transformation. Therefore, we propose a new hybrid approach which combines a fractional motion estimation technique. Several studies were carried out to reduce the spatial and temporal redundancies, hence at the level of spatial video coding, we use a new approach based on sub-bands coding through a discrete wavelet transformation. This technique is based on the principle of the EZW algorithm of Shapiro. It proceeds by separating the encoding of the signs and the magnitudes of wavelet coefficients. Then, at the level of temporal compression, we propose a study of motion estimation with different accuracy based on image interpolation to improve the quality of predicted frame. Next, we present a representation reducing the size of the motion vector field and we compress it by two of entropic coding approaches namely Huffman coding and arithmetic coding.
The proposed video codec was applied on a video sequence with different sizes (CIF and QCIF) and different dynamics. The obtained results, in terms of objective assessment (PSNR, the SSIM and VQM), were satisfactory compared with other video coding standards. We have also proposed a subjective evaluation and the results are compared to those obtained by H.264/AVC standard.
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