Image encoding method, image decoding method, encoder, decoder and storage medium
An image coding and coding technology, applied in the field of communication, can solve problems such as unavailability of reference pixels, large intra-frame prediction errors, and large coding bit overhead.
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Embodiment 1
[0224] see figure 1 , an embodiment of the present disclosure proposes an image coding method, including:
[0225] Step 101: Determine the first reference sample value of the coding block according to the pixel sample value in the coding block;
[0226] Optionally, step 101 specifically includes: judging whether there is a reference sample value of the coding block, and the reference sample value is the restored pixel sample value of one or more pixel points adjacent to the coding block; if part or all of the coding block reference If the sample value does not exist, then determine the first reference sample value of the coding block according to the pixel sample value in the coding block;
[0227] Alternatively, it is judged whether all the reference samples in the matching block of the coding block exist; if some or all of the reference samples in the matching block of the coding block do not exist, it is judged that some or all of the reference samples of the coding block ...
Embodiment 2
[0267] see figure 2 , an embodiment of the present disclosure proposes an image decoding method, including:
[0268] Step 201: Parsing the code stream to obtain the first reference sample value, intra prediction mode and prediction difference parameter of the decoded block;
[0269] Optionally, in step 201, the code stream is analyzed to obtain the first reference sample value of the decoded block, including:
[0270] Analyzing one or more data units in the code stream to obtain the first reference sample, where the data units include at least one of the following: one or more parameter sets, slice headers, and block layer data units.
[0271] Further, the code stream is analyzed to obtain the first reference sample value of the decoded block, including:
[0272] Parsing one or more data units in the code stream to obtain a sample value usage mode parameter, wherein the sample value usage mode parameter is used to indicate that the multiple samples contained in the first re...
Embodiment 3
[0304] see image 3 , an embodiment of the present disclosure proposes an image coding device, including a first reference sample value determination unit 3001, an intra-frame prediction value determination unit 3002, a prediction difference parameter acquisition unit 3003, and an encoding unit 3004, wherein:
[0305] The first reference sample value determining unit 3001 is configured to determine the first reference sample value of the coding block according to the pixel sample value in the coding block;
[0306] An intra prediction value determining unit 3002, configured to determine the intra prediction mode of the coding block according to the first reference sample value determined by the first reference sample value determining unit 3001, and calculate the intra prediction value of the coding block;
[0307] A prediction difference parameter obtaining unit 3003, configured to obtain a prediction difference parameter according to the original value of the coding block an...
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