Motion vector field coding method and decoding method, coding and decoding device
A technology of motion vector field and motion vector, applied in the field of image processing, can solve the problem of not being able to effectively compress the motion vector field
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Embodiment 1
[0195] Embodiment 1: Since the movement of the object has a certain continuity in time, the motion vector field has a certain correlation in time, that is, at least part of the current block will appear in the reference motion vector field, but the current block The position in the current field is not necessarily the same as the position in the reference motion vector field.
[0196] For clarity of description, herein, the position of a motion vector field block in the motion vector field refers to the coordinate range of the motion vector field block in the motion vector field. Then, the position of the motion vector field block p in the motion vector field P is the same as the position of the motion vector field block q in the motion vector field Q, which means that the coordinate range of the motion vector field block p in the motion vector field P is the same as the motion The coordinate range of the vector field block q in the motion vector field Q is the same.
[0197]...
Embodiment 2
[0199] Embodiment 2: In this embodiment, assuming that the motion state of the same object captured in the video sequence remains unchanged within a relatively short period of time, that is, the motion direction and size remain unchanged, then the current block can be deduced based on the reference motion vector field predictive signal.
[0200] Specifically, in this embodiment, such as image 3 As shown, obtaining the prediction signal of the current block specifically includes:
[0201] S11. Acquire a first reference motion vector field of the current motion vector field block.
[0202] The first reference motion vector field is an encoded and reconstructed motion vector field adjacent to the current field. For convenience of description, the video frame corresponding to the current field is called the video frame at time t, and the video frame corresponding to the first reference motion vector field is called the video frame at time t1. Wherein, the time t1 may be before...
example 3
[0274] Example 3. Obtaining the direction coefficient of the current block includes:
[0275] When the direction coefficients of at least two encoded motion vector field blocks adjacent to the current motion vector field block in the current motion vector field are the same, the direction coefficients of the at least two encoded motion vector field blocks are used as The direction coefficient of the current motion vector field block.
[0276] When the direction coefficients of at least two encoded blocks adjacent to the current block are the same, it can be inferred that the images of the at least two encoded blocks belong to the same object, and then it is assumed that the image of the current block and the at least two encoded blocks The images of belong to the same object, therefore, it can be directly determined that the direction coefficient of the current block is the same as the direction coefficient of the at least two coded blocks.
[0277] In this embodiment, the di...
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