Scalable MPEG video/macro block rate control
AssigneesSony Corporation, Sony Electronics Inc.
InventorHung-Ju Lee
Life of this patent
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Abstract
A scaleable macro block rate control method particularly well-suited for MPEG video. There is provided a method to easily derive a quantization parameter (QP) value using information such as bit usage, previous QP values and SAD values from the past encoded and future frames. The method utilizes quantization estimation techniques based on statistical relationships between different intensity measures, such as distortion intensity, absolute difference intensity and mean of absolute difference intensity. The method is well-suited to applications utilizing MPEG video such as MPEG-1, MPEG-2, MPEG-4, JVT/H.264 standards and so forth.
Claims8
A method for scalable rate control for MPEG video, comprising:
- calculating an average bit count using a plurality of future frames;
- calculating a previous bit count using a past encoded frame;
- calculating a target Qscale using the average bit count and previous bit count to adjust a deficit/surplus bit rate budget;
- refining Qscale using SAD statistics from past encoded frames and current buffer status;
- and
- bounding Qscale in the range of pre-defined MinQP and MaxQP values.
Dependencies are inferred from the claim text.