METHOD OF CONTENT ADAPTIVE VIDEO ENCODING

• US 20130301703A1
• Filed: 07/16/2013
• Published: 11/14/2013
• Est. Priority Date: 06/05/2001
• Status: Active Grant

• Current Assignee: AT&T Intellectual Property II LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property II LP (AT&T, Inc.)
• Inventors: Puri, Atul, Civanlar, Mehmet Reha
• Granted Patent: US 8,804,818 B2
• Time in Patent Office: Days
• US Class Current: 375/240.02
• CPC Class Codes: H04N 19/119 Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
• CPC Class Codes: H04N 19/12 Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
• CPC Class Codes: H04N 19/124 Quantisation
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/14 Coding unit complexity, e.g. amount of activity or edge presence estimation H04N19/146 takes precedence
• CPC Class Codes: H04N 19/16 for a given display mode, e.g. for interlaced or progressive display mode
• CPC Class Codes: H04N 19/162 User input
• CPC Class Codes: H04N 19/167 Position within a video image, e.g. region of interest [ROI]
• CPC Class Codes: H04N 19/17 the unit being an image region, e.g. an object
• CPC Class Codes: H04N 19/172 the region being a picture, frame or field
• CPC Class Codes: H04N 19/179 the unit being a scene or a shot
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/59 involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
• CPC Class Codes: H04N 19/80 Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation H04N19/635, H04N19/86 take precedence
• CPC Class Codes: H04N 19/86 involving reduction of coding artifacts, e.g. of blockiness
• CPC Class Codes: H04N 19/87 involving scene cut or scene change detection in combination with video compression

Abstract

A method of content adaptive encoding video comprising segmenting video content into segments based on predefined classifications or models. Based on the segment classifications, each segment is encoded with a different encoder chosen from a plurality of encoders. Each encoder is associated with a model. The chosen encoder is particularly suited to encoding the unique subject matter of the segment. The coded bit-stream for each segment includes information regarding which encoder was used to encode that segment. A matching decoder of a plurality of decoders is chosen using the information in the coded bitstream to decode each segment using a decoder suited for the classification or model of the segment. If scenes exist which do not fall in a predefined classification, or where classification is more difficult based on the scene content, these scenes are segmented, coded and decoded using a generic coder and decoder.

Claims

1. A decoder comprising:

a processor; and

a computer-readable storage medium having instructions stored which, when executed by the processor, result in the processor performing operations comprising;

receiving header information associated with an assigned predefined content model for a region of interest in video content, wherein the region of interest comprises a rectangular-based region covering less than a full frame identified on a frame-by-frame basis by a first sub-segment in the respective region of interest and a last sub-segment in the region of interest, to yield a portion of the full frame not covered by the region of interest, and wherein the assigned predefined content model is assigned to the region of interest and not to the portion of the full frame; and

decoding the region of interest, based on the header information and the assigned predefined content model, differently than the portion of the full frame.

2. The decoder of claim 1, wherein the assigned predefined model causes the decoder to adaptively dequantize the region of interest.

3. The decoder of claim 1, wherein the first sub-segment is positioned in a top left corner of the respective region of interest.

4. The decoder of claim 1, wherein the decoder is selected as a decoder from a plurality of decoders.

5. The decoder of claim 1, wherein region of interest information is found in a header.

6. The decoder of claim 1, wherein the region of interest comprises an arbitrary shaped object in a portion of the full frame, where the portion is smaller than the full frame.

7. The decoder of claim 1, wherein region of interest information indicates a boundary of the region of interest.

8. A method comprising:

receiving header information associated with an assigned predefined content model for a region of interest in video content, wherein the region of interest comprises a rectangular-based region covering less than a full frame identified on a frame-by-frame basis by a first sub-segment in the respective region of interest and a last sub-segment in the region of interest, to yield a portion of the full frame not covered by the region of interest, and wherein the assigned predefined content model is assigned to the region of interest and not to the portion of the full frame; and

decoding, via a processor, the region of interest, based on the header information and the assigned predefined content model, differently than the portion of the full frame.

9. The method of claim 8, wherein the assigned predefined model causes the decoder to adaptively dequantize the region of interest.

10. The method of claim 8, wherein the first sub-segment is positioned in a top left corner of the respective region of interest.

11. The method of claim 8, wherein region of interest information is found in a header.

12. The method of claim 8, wherein the region of interest comprises an arbitrary shaped object in a portion of the full frame, where the portion is smaller than the full frame.

13. The method of claim 8, wherein region of interest information indicates a boundary of the region of interest.

14. The method of claim 8, further comprising receiving an assignment of another predefined quantization content model to a portion of the full frame not covered by the region of interest.

15. A computer-readable storage device having instructions stored which, when executed by a computing device, result in the computing device performing operations comprising:

receiving header information associated with an assigned predefined content model for a region of interest in video content, wherein the region of interest comprises a rectangular-based region covering less than a full frame identified on a frame-by-frame basis by a first sub-segment in the respective region of interest and a last sub-segment in the region of interest, to yield a portion of the full frame not covered by the region of interest, and wherein the assigned predefined content model is assigned to the region of interest and not to the portion of the full frame; and

decoding the region of interest, based on the header information and the assigned predefined content model, differently than the portion of the full frame.

16. The computer-readable storage device of claim 15, wherein the assigned predefined model causes the decoder to adaptively dequantize the region of interest.

17. The computer-readable storage device of claim 15, wherein the first sub-segment is positioned in a top left corner of the respective region of interest.

18. The computer-readable storage device of claim 15, wherein region of interest information is found in a header.

19. The computer-readable storage device of claim 15, wherein the region of interest comprises an arbitrary shaped object in a portion of the full frame, where the portion is smaller than the full frame.

20. The computer-readable storage device of claim 15, wherein region of interest information indicates a boundary of the region of interest.