Reduction of I-pulsing artifacts
View Patent ↗Various methods and systems are provided for reduction of I-pulsing artifacts. In one example, a portion of a picture is modified to be encoded as an I picture based in part upon a picture that precedes the picture. The modification can reduce an I-pulsing artifact associated with the I picture. The modified picture is intra-coded for inclusion in a series of encoded pictures, which may then be transmitted. In another example, an encoder includes adaptive pre-processing circuitry and intra-encoding processing circuitry. The pre-processing circuitry modifies a portion of a first picture based in part upon a second picture that precedes the first picture in a series of video pictures. For example, the modification may be based upon coding noise associated with the preceding picture. The intra-encoding processing circuitry encodes the modified picture as an I picture.
1. A method for encoding video, comprising:
modifying at least a portion of one picture of a series of video pictures based at least in part upon coding noise associated with a picture of the series of video pictures that precedes the one picture; and
intra-coding the modified picture to generate an intra-coded (I) picture for inclusion in the series of encoded pictures.
2. The method of claim 1 , wherein modifying at least a portion of the one picture reduces an I-pulsing artifact associated with the I picture.
3. The method of claim 1 , wherein the preceding picture is encoded as an inter-coded (P or B) picture.
4. The method of claim 3 , wherein the one picture is modified based at least in part upon a reconstructed version of the encoded preceding picture.
5. The method of claim 4 , wherein the one picture is modified based at least in part upon a motion compensated version of the reconstructed preceding picture.
6. The method of claim 5 , wherein modifying the at least a portion of the one picture comprises blending a portion of the one picture with a corresponding portion of the motion compensated reconstructed preceding picture based upon a blending factor.
7. The method of claim 6 , comprising:
determining a motion compensated residual based upon a difference between the portion of the one picture and the corresponding portion of the motion compensated reconstructed preceding picture; and
determining the blending factor based at least in part upon the motion compensated residual.
8. The method of claim 3 , comprising determining the coding noise of the preceding picture, wherein the one picture is modified based at least in part upon a motion compensated version of the coding noise.
9. The method of claim 8 , wherein the modification based on the coding noise comprises adjusting the coding noise by a scale factor, wherein the scale factor is based at least in part upon a motion vector associated with the corresponding portion of the motion compensated reconstructed preceding picture.
10. The method of claim 8 , wherein the modification based on the coding noise comprises adjusting the coding noise by a scale factor, wherein the scale factor is based at least in part upon a quantization parameter (QP) associated with the portion of the one picture.
11. The method of claim 4 , wherein modifying the at least a portion of the one picture comprises blending a portion of the one picture with a corresponding portion of the reconstructed preceding picture.
12. The method of claim 1 , wherein the coding noise is generated during encoding of the preceding picture.
13. The method of claim 1 , wherein modifying the at least a portion of the one picture comprises:
encoding the one picture as a predicted (P) picture; and
reconstructing the P picture to generate the modified picture.
14. An encoder, comprising:
adaptive pre-processing circuitry configured to:
receive a series of video pictures including a picture to be encoded as an intra-coded (I) picture, and
modify at least a portion of the picture to be encoded as the I picture based at least in part upon coding noise associated with a picture of the series of video pictures that precedes the picture to be encoded as the I picture; and
intra-encoding processing circuitry configured to encode the modified picture to generate the I picture.
15. The encoder of claim 14 , wherein the coding noise is the difference between the preceding picture and a reconstructed version of the preceding picture.
16. The encoder of claim 15 , wherein the adaptive pre-processing circuitry comprises a modulation control configured to adjust at least a portion of the coding noise based at least in part upon a motion vector associated with a corresponding portion of the preceding picture.
17. The encoder of claim 16 , wherein the motion vector is determined by coarse motion estimation.
18. The encoder of claim 15 , wherein the adaptive pre-processing circuitry is configured to motion compensate the coding noise prior to modifying the at least a portion of the picture to be encoded as the I picture.
19. The encoder of claim 18 , wherein the motion compensation is based upon fine motion estimation.
20. An encoder, comprising:
adaptive pre-processing circuitry configured to modify at least a portion of a video picture for encoding as an intra-coded (I) picture, where the at least a portion of the video picture is modified based at least in part upon a coding noise of a reconstructed picture that precedes the I picture in a series of encoded video pictures; and
intra-encoding processing circuitry configured to encode the modified video picture as the I picture.
21. The encoder of claim 20 , wherein the adaptive pre-processing circuitry is configured to blend a portion of the reconstructed preceding picture with a corresponding portion of the video picture to generate the modified video picture.
22. The encoder of claim 20 , wherein the adaptive pre-processing circuitry is configured to encode the video picture as a predicted (P) picture and reconstruct the P picture to generate the modified video picture.