METHOD FOR USING A DECODER OR LOOK-AHEAD ENCODER TO CONTROL AN ADAPTIVE PRE-FILTER

摘要

An adaptive video pre-filter system is provided that uses a blend of both spatially neighboring pixels and motion compensated neighboring pixels to produce a filtered output that has reduced pixel noise to drive a primary encoder. In one embodiment, the pre-filter is used with a look-ahead encoder that provides a complexity input control to a pre-filter enabling the pre-filter to provide a filtered video signal to a primary encoder. A complexity model is provided between the look-ahead encoder and the pre-filter to enable an increase or decrease in the filtering strength to be provided depending upon the complexity of the input signal. In a further embodiment, the look-ahead encoder is replaced with a decoder to provide complexity values. In some embodiments, a delay buffer is provided to buffer the complexity values between the complexity model and the pre-filter and buffering is further provided with the same delay to buffer the video frames to the pre-filter to smooth filtering in the pre-filter.

主权项

1. An encoder system comprising:
a primary encoder; a look-ahead encoder receiving an input video signal; a complexity to filter strength module receiving a complexity signal output from the look-ahead encoder and providing a filter strength control output signal; and an adaptive pre-filter (APF) having a first input receiving the video signal and a second input receiving a control output from the filter strength module, pre-filter providing a filtered version of the video signal to the primary encoder.