Adaptive Frequency Coefficient Suppression for ROI-Based H.264/AVC Video Coding

In this paper, we present a novel adaptive frequency coefficient suppression technique (AFCS) for region-of-interest (ROI) based H.264/AVC video coding. With the consideration of human visual system (HVS), AFCS can adaptively suppress the selective frequency coefficients of 4 x 4 blocks in non-ROI. Many bits for non-ROI are thus saved and reallocated to ROI to improve its visual quality. In addition, unlike most of the existing ROI-based methods based on the MB-layer rate control method, any frame-layer rate control method can be adopted in our scheme, which reduces the computational overhead of the encoder.