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Bit Rate control plays an important role in video coding. Region of Interest (ROI) based rate control has been attracting great attention due to the rapid demands in the region of interest in video coding. The main issue in video coding is the trade off between compression ratio and quality of the reconstructed signal. It is obvious that better quality can be achieved with smaller compression ratio and higher encoded stream bit rate. An optimal coder requires knowledge of the rate distortiondoi:10.7763/ijcte.2011.v3.382 fatcat:wmg2wsyoqne3npldblrikufcna