Feedforward Control Of Hybrid Transform / Predictive Coder

Takashi Mochizuki; Jun-ichi Ohki

doi:10.1117/12.969032

25 October 1988 Feedforward Control Of Hybrid Transform / Predictive Coder

Takashi Mochizuki, Jun-ichi Ohki

Proceedings Volume 1001, Visual Communications and Image Processing '88: Third in a Series; (1988) https://doi.org/10.1117/12.969032
Event: Visual Communications and Image Processing III, 1988, Cambridge, MA, United States

Abstract

A new feedforward control method to control encod-ing parameters is proposed for low bit rate video encoding. At low transmission bit rates, all input video frames cannot be transmitted and an encoding frame interval varies with the information amount in each encoded frame. Subjective video quality is evaluated from both picture degradation and encoding frame intervals. Because picture degradation and encoding frame intervals are traded off, encoding parameter control is very important. The proposed method is based on a hybrid transform predictive coding scheme with adaptive coefficient selection. The method estimates the amount of information for some encoding parameters and selects parameters so that given control characteristics can be achieved. Computer simulations for both the proposed method and a conventional feedback method show the effectiveness of the new method. This method will be applied to an NETEC series low bit rate video codec.

Citation Download Citation

Takashi Mochizuki and Jun-ichi Ohki "Feedforward Control Of Hybrid Transform / Predictive Coder", Proc. SPIE 1001, Visual Communications and Image Processing '88: Third in a Series, (25 October 1988); https://doi.org/10.1117/12.969032

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