Figure 12From: Region-of-interest determination and bit-rate conversion for H.264 video transcoding The subjective comparison for the 32nd frame of Akiyo sequence with bit-rate of 220 Kbps. (a) Pre-encoded frame. The pre-encoded bitstream with bit-rate 1Mbp (b) ROI map detected by [23] (c) Partial frame of pre-encoded sequence (d) Partial frame of CPDT method. PSNRROI: 35.71dB, SSIMROI: 0.94, and (e) Partial frame of ROI-based transcoder. PSNRROI: 37.06 dB, SSIMROI: 0.96.Back to article page