Bit rate control using short-term and long-term performance char

Details Bit rate control using short-term and long-term performance char Bit rate control using short-term and long-term performance char

1995-12-07

1998-11-03

Moore, David K.

Image analysis

Image compression or coding

Adaptive coding

348416, 348415, G06K 936, H04N 712

Patent

active

058321250

ABSTRACT:
The performance of video encoding is characterized both over the short term (e.g., based on the previous encoded frame) and over the long term (e.g., based on the previous n encoded frames). An encoding parameter (e.g., the global quantization level) is selected for the current frame based on the short-term and long-term performance characterizations and the current frame is encoded using that selected encoding parameter. In a preferred embodiment, the global quantization (Q) level is permitted to change for only certain (i.e., adjustable) frames. In addition, the global Q level for key frames is generated using special processing which tends to allow the key frames to be encoded using more bits.

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Kronanader, "Post- and Pre-Processing in Coding of Image Sequence Using Filters with Motion Compensated History" 1988 Int. Conf. Acoustics, Speech. Sig. Processing, vol. 2, Apr. 1988, pp. 1104-1107.

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