Patent ID: 8094715
Filing Date: 2012-01-10
Classification: H04N

Abstract:
1. A video signal encoding device, comprising: a prefilter for outputting, based on filter characteristics control data, a predetermined frequency component in an input video signal as current image data; an encoder for subjecting the current image data to an encoding process; and a filter controller for outputting the filter characteristics control data that is set based on encoding parameters provided by the encoder, wherein the prefilter includes: a low-pass filter for outputting a low-frequency component in the input video signal; a first output unit for correcting the low-frequency component based on the filter characteristics control data for output as a corrected low-frequency component; and a second output unit for correcting the input video signal based on the filter characteristics control data for output as a corrected video signal, wherein the prefilter outputs the predetermined frequency component in the input video signal based on the corrected low-frequency component or the corrected video signal, wherein a first gain used for the correction of the low-frequency component by the first output unit and a second gain used for the correction of the input video signal by the second output unit are determined based on the filter characteristics control data, and when a quantiser scale (Qp) included in encoding parameters is enlarged, the first gain is increased and the second gain is decreased.