Method and apparatus for effectively compressing motion vectors in video coder based on multi-layer
First Claim
1. A method for efficiently compressing multi-layered motion vectors, the method comprising:
- (a) obtaining, by a video encoder, a motion vector in a base layer frame having a first frame rate from an input frame;
(b) obtaining, by the video encoder, a motion vector in a first enhancement layer frame having a second frame rate from the input frame, the second frame rate being greater than the first frame rate;
(c) generating, by the video encoder, a predicted motion vector by referring to a motion vector for at least one frame among base layer frames present immediately before and after the same temporal position as the first enhancement layer frame if there is no base layer frame at the same temporal position as the first enhancement layer frame; and
(d) coding, by a video encoder, a difference between the motion vector in the first enhancement layer frame and the generated predicted motion vector, and the obtained motion vector in the base layer.
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Abstract
A method and apparatus of improving the compression efficiency of a motion vector by efficiently predicting a motion vector in an enhancement layer from a motion vector in a base layer in a video coding method using a multi-layer are provided. The method includes obtaining a motion vector in a base layer frame having a first frame rate from an input frame, obtaining a motion vector in a first enhancement layer frame having a second frame rate from the input frame, the second frame rate being greater than the first frame rate, generating a predicted motion vector by referring to a motion vector for at least one frame among base layer frames present immediately before and after the same temporal position as the first enhancement layer frame if there is no base layer frame at the same temporal position as the first enhancement layer frame, and coding a difference between the motion vector in the first enhancement layer frame and the generated predicted motion vector, and the obtained motion vector in the base layer.
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Citations
21 Claims
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1. A method for efficiently compressing multi-layered motion vectors, the method comprising:
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(a) obtaining, by a video encoder, a motion vector in a base layer frame having a first frame rate from an input frame; (b) obtaining, by the video encoder, a motion vector in a first enhancement layer frame having a second frame rate from the input frame, the second frame rate being greater than the first frame rate; (c) generating, by the video encoder, a predicted motion vector by referring to a motion vector for at least one frame among base layer frames present immediately before and after the same temporal position as the first enhancement layer frame if there is no base layer frame at the same temporal position as the first enhancement layer frame; and (d) coding, by a video encoder, a difference between the motion vector in the first enhancement layer frame and the generated predicted motion vector, and the obtained motion vector in the base layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for efficiently encoding multi-layered motion vectors, the method comprising:
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(a) obtaining a motion vector in a base layer frame having a first frame rate from an input frame; (b) obtaining a motion vector in a first enhancement layer frame having a second frame rate from the input frame, the second frame rate being greater than the first frame rate; (c) generating a predicted motion vector by referring to a motion vector for at least one frame among base layer frames present immediately before and after the same temporal position as the first enhancement layer frame if there is no base layer frame at the same temporal position as the first enhancement layer frame; (d) lossy coding texture data of the base layer frame using the motion vector of the base layer frame; (e) coding a difference between the motion vector in the first enhancement layer frame and the generated predicted motion vector, and the obtained motion vector in the base layer; and (f) losslessly coding a difference between the motion vector in the first enhancement layer frame and the generated predicted motion vector, the motion vector in the base layer frame, the lossy coded result of operation (d), and the lossy coded result of operation (e). - View Dependent Claims (11)
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12. A multi-layered video encoding method comprising:
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(a) obtaining a motion vector in a base layer frame having a first frame rate from an input frame; (b) generating a motion vector by referring to a motion vector for at least one frame among base layer frames present immediately before and after the same temporal position as a first enhancement layer frame if there is no base layer frame at the same temporal position as the first enhancement layer frame; (c) lossy coding texture data of the base layer frame using the motion vector of the base layer frame; (d) lossy coding texture data of the first enhancement layer frame using the motion vector of the first enhancement layer frame; and (e) losslessly coding the motion vector in the base layer frame, the lossy coded result of operation (c), and the lossy coded result of operation (d).
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13. A multi-layered video decoding method comprising:
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(a) extracting base layer data and enhancement layer data from an input bitstream; (b) if there is no base layer frame at the same temporal position as a first enhancement layer frame, generating a motion vector of the first enhancement layer frame by referring to the motion vector for at least one frame among base layer frames present immediately before and after the same temporal position as the first enhancement layer frame; (c) reconstructing the motion vector of the enhancement layer using the generated predicted motion vector; and (d) reconstructing a video sequence from texture data of the enhancement layer using the reconstructed motion vector of the enhancement layer. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A multi-layered video decoding method comprising:
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(a) extracting base layer data and enhancement layer data from an input bitstream; (b) if there is no base layer frame at the same temporal position as an enhancement layer frame, reconstructing a motion vector in the enhancement layer frame by referring to at least one frame among base layer frames present immediately before and after the same temporal position as the enhancement layer frame; and (c) reconstructing a video sequence from texture data of the enhancement layer using the reconstructed motion vector of the enhancement layer. - View Dependent Claims (21)
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Specification