An Improved H.264 Codec Algorithm Based on Regions of Interest
Because observers’ attention to the region of interest is higher than other parts (the background) of the image , This paper discribes an improved H.264 codec algorithm based on regions of interest. This method according to the degree of regional interest, adjusting the quantization step size, quantified the region of interest in detailed, and coarsely quantized other regions. ROI information was transmitted to the decoder and then carried out corresponding inverse quantization. Experimental results show that the output bit rate was decreased of 10% -20% by using this improved algorithm in H.264 reference encoder, but the subjective quality of decoded image is as good as the standard H.264 encoders.
Yungang Li, Pengcheng Wang, Liqun Ai, Xiaoming Sang and Jinglong Bu
Z. Y. Wang et al., "An Improved H.264 Codec Algorithm Based on Regions of Interest", Advanced Materials Research, Vols. 291-294, pp. 2794-2798, 2011