Video transcoding system with quality readjustment based on high scene cost detection and method for use therewith

Patent metadata

Field	Value
Publication number	US-9407925-B2
Application number	US-26120408-A
Country	US
Kind code	B2
Filing date	Oct 30, 2008
Priority date	Oct 30, 2008
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

A system for transcoding a video signal into a transcoded video signal, includes a high scene cost detection module that detects a high scene cost corresponding to at least one image of the video signal. An encoder section generates the transcoded video signal, wherein, when the high scene cost is detected, an enhanced quality is assigned to at least one central region.

First claim

What is claimed is:

1. A system for transcoding a video signal into a transcoded video signal, the video signal including a plurality of images with persistent high scene complexity, the system comprising:
a high scene cost detection module that detects a high scene cost corresponding to the plurality of images with persistent high scene complexity; and
an transcoder section, coupled to the high scene cost detection module, that generates the transcoded video signal, wherein, when the high scene cost is detected, an enhanced quality is assigned to at least one central region, wherein the transcoded video signal is a variable bit rate signal and wherein the transcoder section assigns a quality to regions of the at least one image outside of the at least one central region that is lower than the enhanced quality.

2. The system of claim 1 wherein the high scene cost detection module generates a scene cost based on at least one encoding parameter of video signal.

3. The system of claim 2 wherein the at least one encoding parameter includes a number of bits used to encode the plurality of images.

4. The system of claim 2 wherein the at least one encoding parameter includes an average variance of a plurality of macro blocks in the plurality of images.

5. The system of claim 2 wherein the at least one encoding parameter includes a quantization step value.

6. The system of claim 2 wherein the high scene cost detection module compares the scene cost to a scene cost threshold and wherein the high scene cost detection module detects the high scene cost when the scene cost compares unfavorably to the scene cost threshold.

7. The system of claim 1 wherein the transcoder section detects when a buffer fullness compares favorably to a buffer fullness threshold, and the transcorder section assigns the enhanced quality to the central region of the plurality of images only when the buffer fullness compares favorably to the buffer fullness threshold.

8. The system of claim 1 wherein the video signal is a MPEG-2 signal and the transcoded video signal is an AVC signal.

9. A method for transcoding a video signal into a transcoded video signal, the video signal including a plurality of images with persistent high scene complexity, the method comprising:
detecting a high scene cost corresponding to the plurality of images with persistent high scene complexity; and
generating the transcoded video signal, wherein, when the high scene cost is detected, an enhanced quality is assigned to at least one central region, wherein the transcoded video signal is a variable bit rate signal and wherein generating the transcoded video signal assigns a quality to regions of the at least one image outside of the at least one central region that is lower than the enhanced quality.

10. The method of claim 9 wherein detecting the high scene cost includes generating a scene cost based on at least one encoding parameter of video signal.

11. The method of claim 10 wherein the at least one encoding parameter includes a number of bits used to encode the plurality of images.

12. The method of claim 10 wherein the at least one encoding parameter includes an average variance of a plurality of macro blocks in the plurality of images.

13. The method of claim 10 wherein the at least one encoding parameter includes a quantization step value.

14. The method of claim 10 wherein detecting the high scene cost includes comparing the scene cost to a scene cost threshold and detecting the high scene cost when the scene cost compares unfavorably to the scene cost threshold.

15. The method of claim 9 further comprising:
detecting when a buffer fullness compares favorably to a buffer fullness threshold;
wherein generating the transcoded video signal includes assigning the enhanced quality to the central region of the plurality of images only when the buffer fullness compares unfavorably to the buffer fullness threshold.

16. The method of claim 9 wherein the video signal is a MPEG-2 signal and the transcoded video signal is an AVC signal.

17. A system for transcoding a video signal into a transcoded video signal, the video signal including a plurality of images with persistent high scene complexity, the system comprising:
a high scene cost detection module that detects a high scene cost corresponding to the plurality of images with persistent high scene complexity; and
an transcoder section, coupled to the high scene cost detection module, that generates the transcoded video signal, wherein, when the high scene cost is detected, an enhanced quality is assigned to at least one central region, wherein the transcoded video signal is a constant bit rate signal and wherein the transcoder section assigns a diminished quality to regions of the at least one image outside of the at least one central region.

18. The system of claim 17 wherein the high scene cost detection module generates a scene cost based on at least one encoding parameter of video signal.

19. The system of claim 18 wherein the at least one encoding parameter includes at least one of: a number of bits used to encode the at least one image, an average variance of a plurality of macro blocks in the at least one image, or a quantization step value.

20. The system of claim 18 wherein the high scene cost detection module compares the scene cost to a scene cost threshold and wherein the high scene cost detection module detects the high scene cost when the scene cost compares unfavorably to the scene cost threshold.

Assignees

• Ramachandran Avinash
• Vixs Systems Inc

Inventors

• Ramachandran Avinash

Classifications

• H04N19/126

  Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers · CPC title

• H04N19/152

  by measuring the fullness of the transmission buffer · CPC title

• H04N19/124

  Quantisation · CPC title

• H04N19/40 Primary

  using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream · CPC title

• H04N19/14

  Coding unit complexity, e.g. amount of activity or edge presence estimation (H04N19/146 takes precedence) · CPC title