A practical foveation-based rate-shaping mechanism for MPEG videos
Foveation is one of the nonuniform resolution properties of the human visual system. Recently, different foveation models are proposed and utilized for image and video coding, for the sake of bit-rate saving with no or minor perceptual quality distortion. In the first part of this paper, we propose an efficient and practical DCT-domain foveation model, which is deduced from existing experimental results. In the second part, we present a foveation-based rate-shaping mechanism for MPEG bitstreams, as an application example of the proposed foveation model. The rate shaper is based on eliminating DCT coefficients embedded in MPEG bitstreams. An efficient rate-shaping mechanism is developed to meet various bit-rate requirements. Our simulation confirmed that the proposed foveation model and the rate-shaping mechanism are practical for real-world usage.