Video encoder and method for adjusting quantization step in real time
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United States of America Patent
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Mar 18, 2003
Grant Date -
N/A
app pub date -
Oct 26, 1999
filing date -
Oct 26, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A video encoder for encoding a series of groups of frames with an adjustable quantization step, and a method for adjusting the quantization step. The method tracks a complexity parameter of the encoded scenes, and computes a first quantization value in dependence upon the generated complexity parameter. The method further computes a minimum and a maximum step size in dependence upon a number of the bits that have already been generated, and upon the preset target number of bits. The quantization step for the next group of pictures is set in accordance with the first quantization value, but subject to the range defined by the minimum and maximum step sizes. The method further adjusts the minimum and the maximum step sizes.
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