Constant quality rate-control for video encoding based on activity segmentation

MPEG-4 constant-quality constant-bit-rate control algorithms

“…Rate-distortion optimization is than applied to compute the best QP for each shot. Note that bidirectional coding is not allowed in [12].…”

“…In [7,8], the quality is controlled indirectly through the target bit allocation that uses MAD (in [7]) or number of zeros (in [8]) to compute the target bits. Both [10,12] are intended for offline use. The rate/distortion information is computed offline prior to the actual encoding.…”

“…Dynamic Programming (DP) is used to allocate bit/distortion for different frames and layers. For [12], the input sequence is first segmented into shots based on scene activities. Rate-distortion optimization is than applied to compute the best QP for each shot.…”

“…In the past few years, several CQ algorithms [3,[7][8][9][10]12,15,16,19,22,23] have been proposed. Different QP control strategies, rate-distortion models, and channel properties (CBR/VBR) are used/assumed.…”

Constant quality video coding using video content analysis

“…In this paper, an off-line segment-based rate control framework for constant quality video is presented that overcomes the above-described shortcomings [16,17]. More specifically, a solution for optimal bit allocation in a lexicographic sense (equal distortion criterion) among multiple, varying scenes in a heterogeneous video sequence is proposed, based on efficient, operational segmentbased R-D modelling without falling into excessive computational complexity.…”