SYSTEMS AND METHODS FOR COMPRESSING VIDEO

• US 20190313103A1
• Filed: 04/05/2019
• Published: 10/10/2019
• Est. Priority Date: 04/06/2018
• Status: Active Grant

• Current Assignee: Comcast Cable Communications LLC (Comcast Corporation)
• Original Assignee: Comcast Cable Communications LLC (Comcast Corporation)
• Inventors: Giladi, Alexander
• Granted Patent: US 10,880,550 B2
• Time in Patent Office: Days
• CPC Class Codes: H04N 19/105 Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
• CPC Class Codes: H04N 19/107 between spatial and temporal predictive coding, e.g. picture refresh
• CPC Class Codes: H04N 19/142 Detection of scene cut or scene change
• CPC Class Codes: H04N 19/159 Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
• 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 19/517 by encoding
• CPC Class Codes: H04N 19/577 Motion compensation with bidirectional frame interpolation, i.e. using B-pictures
• CPC Class Codes: H04N 19/87 involving scene cut or scene change detection in combination with video compression

Abstract

Systems, methods, and apparatuses are described for compressing digital content. The digital content may comprise a plurality of frames. The plurality of frames may comprise a plurality of crossfade frames. A first boundary frame of the crossfade frames may be determined. A second boundary frame of the crossfade frames may be determined. At least a portion of the crossfade frames may be coded as inter-predicted frames using a weighting factor and based on the first boundary frame or the second boundary frame.

Claims

1. A method comprising:

receiving video content comprising a plurality of frames, wherein the plurality of frames comprise a plurality of crossfade frames;

determining a first boundary frame of the plurality of crossfade frames, wherein the first boundary frame comprises a first scene;

determining a second boundary frame of the plurality of crossfade frames, wherein the second boundary frame comprises a second scene different from the first scene; and

encoding, using a weighting factor and based on at least one of the first boundary frame or the second boundary frame, at least a portion of a plurality of transition frames of the plurality of crossfade frames as inter-predicted frames, wherein the plurality of transition frames comprise successive stages of a transition from the first scene to the second scene.

2. The method of claim 1, wherein the method further comprises determining, based on the determining the first boundary frame and the determining the second boundary frame, not to encode at least one frame of the plurality of transition frames as an intra-coded frame (I-frame).

3. The method of claim 1, wherein the determining the first boundary frame comprises comparing data associated with at least one of intensity, chroma, luminance, or luma of pixels of the first boundary frame and data associated with the at least one of intensity, chroma, luminance, or luma of pixels of at least another frame of the plurality of frames.

4. The method of claim 1, wherein the determining the first boundary frame comprises:

determining a boundary confidence value for the first boundary frame; and

determining that the boundary confidence value at least one of meets or exceeds a boundary confidence threshold value.

5. The method of claim 1, wherein the method further comprises:

determining, based on the determining the first boundary frame and the determining the second boundary frame, not to calculate a data size of a subset of the plurality of transition frames as encoded frame types; and

calculating a data size of one or more frames of the plurality of transition frames as encoded frame types, wherein the one or more frames are not in the subset.

6. The method of claim 1, further comprising coding at least one of the first boundary frame or the second boundary frame as an intra-coded frame (I-frame).

7. The method of claim 1, wherein the weighting factor is associated with one or more motion vectors referencing at least one of the first boundary frame or the second boundary frame.

8. The method of claim 1, wherein the encoding the at least the portion of the plurality of transition frames as inter-predicted frames comprises encoding the at least the portion of the plurality of transition frames based at least on a sequence of the plurality of crossfade frames.

9. The method of claim 1, wherein the weighting factor comprises:

a first weighting factor associated with at least one of the first boundary frame or the second boundary frame; and

a second weighting factor associated with a frame of the plurality of crossfade frames, wherein the frame is different than the at least one of the first boundary frame or the second boundary frame.

10. The method of claim 1, wherein the method further comprises sending, to a decoder, an encoded first boundary frame, an encoded second boundary frame, and the encoded at least the portion of the plurality of transition frames.

11. The method of claim 1, wherein the encoding the at least the portion of the plurality of transition frames as inter-predicted frames comprises:

determining at least one motion vector; and

scaling the at least one motion vector by the weighting factor.

12. A system comprising:

a first device configured to;

receive content comprising a plurality of frames, wherein the plurality of frames comprise a plurality of crossfade frames comprising successive stages of a transition from a first scene to a second scene different from the first scene,

determine a first boundary frame of the plurality of crossfade frames comprising the first scene, and

determine a second boundary frame of the plurality of crossfade frames comprising the second scene; and

a second device configured to;

receive, from the first device, an indication of the first boundary frame and the second boundary frame, and

encode, based on the indication and using a weighting factor, at least a portion of the plurality of crossfade frames as inter-predicted frames.

13. The system of claim 12, wherein the second device is further configured to encode a plurality of transition frames of the plurality of crossfade frames as inter-predicted frames referencing at least one of the first boundary frame or the second boundary frame.

14. The system of claim 12, wherein the second device is configured to determine the weighting factor based on a sequence of the plurality of crossfade frames.

15. The system of claim 12, wherein the indication of the first boundary frame and the second boundary frame comprises an indication to encode the at least the portion of the plurality of crossfade frames as inter-predicted frames.

16. The system of claim 12, wherein the second device is further configured to encode, based at least on the indication, at least one of the first boundary frame or the second boundary frame as an intra-coded frame (I-frame).

17. A method comprising:

receiving an indication of a first boundary frame and a second boundary frame of a plurality of crossfade frames, wherein the plurality of crossfade frames comprises a transition from a first scene in the first boundary frame to a second scene different from the first scene in the second boundary frame;

encoding, based on the indication, the first boundary frame and the second boundary frame as reference frames; and

encoding, using a weighting factor and based on the indication, at least a portion of a plurality of transition frames of the plurality of crossfade frames as inter-predicted frames, wherein the plurality of transition frames comprises successive stages of the transition.

18. The method of claim 17, wherein the method further comprises determining, based at least on a sequence of the plurality of transition frames, the weighting factor.

19. The method of claim 17, wherein the reference frames comprise intra-coded frames (I-frames).

20. The method of claim 17, wherein the method further comprises receiving an indication of a flash frame of the plurality of frames;

and

encoding, based on the indication of the flash frame, the flash frame as an inter-predicted frame.