Video signal encoding device and video signal encoding method
First Claim
Patent Images
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, whereinthe 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, whereinthe prefilter outputs the predetermined frequency component in the input video signal based on the corrected low-frequency component or the corrected video signal, whereina 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.
1 Assignment
0 Petitions
Accused Products
Abstract
Included are: a prefilter (101) for outputting, based on filter characteristics control data, predetermined frequency components in an input video signal as current image data; encoding means (116) for subjecting the current image data to an encoding process, and outputting encoding parameters together with a bit stream corresponding to current image data as a result of the encoding process; and filter control means (117) for outputting the filter characteristics control data that is set based only on one or two of the encoding parameters.
-
Citations
9 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 8)
-
-
7. A video signal encoding method, comprising:
-
a frequency component output process for outputting, based on filter characteristics control data, a predetermined frequency component in an input video signal as current image data; an encoding parameter output process for subjecting the current image data to an encoding process, and outputting encoding parameters together with a bit stream corresponding to the current image data as a result of the encoding process; and a control data output process for outputting the filter characteristics control data that is set based on the encoding parameters, wherein the frequency component output process includes; a low-frequency component output process for outputting a low-frequency component in the input video signal; a first frequency component correction process for correcting the low-frequency component based on the filter characteristics control data for output as a corrected low-frequency component; and a second frequency component correction process for correcting the input video signal based on the filter characteristics control data for output as a corrected video signal, wherein the frequency component output process 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 at the first frequency component correction process and a second gain used for the correction of the input video signal at the second frequency component correction process are determined based on the filter characteristics control data, and when a quantiser scale (Qp) included in the encoding parameters is enlarged, the first gain is increased and the second gain is decreased.
-
-
9. A non-transitory computer-readable medium having stored thereon computer executable encoding program, the encoding program when executed causes a processor to execute:
-
a frequency component output step of outputting, based on filter characteristics control data, a predetermined frequency component in an input video signal as current image data; an encoding parameter output step of subjecting the current image data to an encoding process, and outputting encoding parameters together with a bit stream corresponding to current image data as a result of the encoding process; and a control data output step of outputting the filter characteristics control data that is set based on the encoding parameters, wherein the frequency component output step includes; a low-frequency component output step of outputting a low-frequency component in the input video signal; a first frequency component correction step of correcting the low-frequency component based on the filter characteristics control data for output as a corrected low-frequency component; and a second frequency component correction step of correcting the input video signal based on the filter characteristics control data for output as a corrected video signal, wherein the frequency component output step 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 at the first frequency component correction step and a second gain used for the correction of the input video signal at the second frequency component correction step are determined based on the filter characteristics control data, and when a quantiser scale (Qp) included in the encoding parameters is enlarged, the first gain is increased and the second gain is decreased.
-
Specification