DocumentCode :
1822557
Title :
Adaptive quantization based on saliency map at frame level of H.264/AVC rate control scheme
Author :
Hrarti, M. ; Saadane, H. ; Larabi, M-C ; Tamtaoui, A. ; Aboutajdine, D.
Author_Institution :
XLIM-SIC, Univ. de Poitiers, Poitiers, France
fYear :
2011
fDate :
4-6 July 2011
Firstpage :
61
Lastpage :
66
Abstract :
In the frame-level rate control algorithm of H.264/AVC baseline profile, the Quantization Parameter (QP) is determined according to a target bit-rate estimated by the bit allocation process and a frame complexity measure. The target bits calculation process assumes similar characteristics for all frames and for a single frame on the whole set; the Mean Average Difference (MAD) is used as complexity measure. As a result, inappropriate QP values are selected leading to inefficient bit allocation. To overcome this limitation, we propose a new frame level QP adjustment. The proposed algorithm exploits a saliency map to allocate more bits to more salient frames. The saliency map is produced simulating the human visual attention by a bottom-up (signal-dependent) approach. Experimental simulations conducted at low bit-rates show that the proposed approach reduces bit-rates up to 26% without visual quality loss when compared to H.264/AVC JM15.0 reference software.
Keywords :
video coding; H.264/AVC rate control scheme; QP adjustment; adaptive quantization; frame-level rate control algorithm; human visual attention; mean average difference; quantization parameter; Bit rate; Complexity theory; Humans; PSNR; Quantization; Software; Visualization; Bit allocation; H.264/AVC; Quantization Parameter; Rate control algorithm; Saliency Map;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Visual Information Processing (EUVIP), 2011 3rd European Workshop on
Conference_Location :
Paris
Print_ISBN :
978-1-4577-0072-9
Type :
conf
DOI :
10.1109/EuVIP.2011.6045539
Filename :
6045539
Link To Document :
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