caa a22 4500 445295449 CHVBK 20180317142540.0 cr unu---uuuuu 170323e20101201xx s 000 0 eng 10.1007/s11554-010-0166-5 doi (NATIONALLICENCE)springer-10.1007/s11554-010-0166-5 DCT-domain coder for digital video applications [Elektronische Daten] [Evgeny Kaminsky, Alex Ginzburg, Ofer Hadar] In this paper, we present an effective DCT-domain video encoder architecture that decreases the computational complexity of conventional hybrid video encoders by reducing the number of transform operations between the pixel and the DCT domains. The fixed video encoder architecture (such as a fixed DCT block of 8×8 size) and a huge number of DCT/IDCT transforms performed during the video encoding process limit the minimum possible computational load of conventional video encoders. In this study, we solve this problem by developing a flexible video encoder architecture, which reduces video encoder computational complexity by performing low-resolution coarse-step motion estimation operations in the DCT domain. When a high level of motion activity is detected, the video encoder slightly increases the computational complexity of the motion estimation operation by computing fine-search block matching for a small-size search window in a reference frame. The proposed DCT-domain video encoder architecture is based on the conventional hybrid coder and on a set of fast integer composition and decomposition DCT transforms. The set of transforms implements a technique for estimation of DCT coefficients of a block that is partitioned by the sub-blocks. Experimental results of this method were compared with the results of the conventional hybrid coder in terms of PSNR quality and computational complexity. This comparison shows that the computational complexity of the proposed encoder is lower by 26.8% with respect to the conventional hybrid video coder for the same objective PSNR quality. Springer-Verlag, 2010 Video compression nationallicence Computational complexity nationallicence Complexity reduction nationallicence Discrete cosine transform (DCT) nationallicence DCT-domain video encoder nationallicence DCT-domain motion estimation nationallicence MPEG-2 nationallicence Kaminsky Evgeny Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, 84105, Beersheba, Israel aut Ginzburg Alex Electro-Optics Unit, Ben-Gurion University of the Negev, 84105, Beersheba, Israel aut Hadar Ofer Department of Communication Systems Engineering, Ben-Gurion University of the Negev, 84105, Beersheba, Israel aut Journal of Real-Time Image Processing Springer-Verlag 5/4(2010-12-01), 259-274 1861-8200 5:4<259 2010 5 11554 https://doi.org/10.1007/s11554-010-0166-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11554-010-0166-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kaminsky Evgeny Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, 84105, Beersheba, Israel aut NATIONALLICENCE 700 1- Ginzburg Alex Electro-Optics Unit, Ben-Gurion University of the Negev, 84105, Beersheba, Israel aut NATIONALLICENCE 700 1- Hadar Ofer Department of Communication Systems Engineering, Ben-Gurion University of the Negev, 84105, Beersheba, Israel aut NATIONALLICENCE 773 0- Journal of Real-Time Image Processing Springer-Verlag 5/4(2010-12-01), 259-274 1861-8200 5:4<259 2010 5 11554 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer