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US 11,153,593 B2Granted
Decoding method, encoding method, and electronic apparatus for decoding/coding
AssigneeKabushiki Kaisha Toshiba
InventorsAkiyuki Tanizawa, Takeshi Chujoh
Life of this patent
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Abstract
An encoding device includes: an index setting unit that sets an index that represents information of a reference image and a weighting factor; an index reconfiguring unit that predicts a reference value of the weighting factor, wherein the reference value indicates a factor to be set if a difference of pixel value between a reference image and a target image to be encoded is less than or equal to a specific value; and an entropy encoding unit that encodes a difference value between the weighting factor and the reference value.
Claims4
A decoding method, comprising:
- decoding a first denominator for a luma weighting factor;
- decoding a first difference value that is equal to a value of a difference between the first denominator and a second denominator for a chroma weighting factor;
- decoding a second difference value of the luma weighting factor, wherein the second difference value is equal to a value of a difference between the luma weighting factor and a first reference value, and the first reference value is equal to a value obtained by left shift of 1 by at least one binary digit specified by the first denominator;
- decoding a third difference value of the chroma weighting factor, wherein the third difference value is equal to a value of a difference between the chroma weighting factor and a second reference value, and the second reference value is equal to a value obtained by left shift of 1 by at least one binary digit specified by the second denominator;
- and
- decoding a fourth difference value of a chroma offset, wherein the fourth difference value is equal to a value of a difference between the chroma offset and a third reference value, and the third reference value is equal to a value obtained by subtracting a value obtained by both multiplying a median value of a maximum pixel value by the chroma weighting factor and shifting to right for the at least one binary digit specified by the second denominator, from the median value.
3 more elements
An encoding method, comprising:
- encoding a first denominator for a luma weighting factor of a target image;
- encoding, by the encoder circuitry, a first difference value of the luma weighting factor, wherein the first difference value is equal to a value of a difference between the luma weighting factor and a first reference value of the luma weighting, wherein the first reference value is equal to a value obtained by a left shift of 1 by at least one binary digit specified by the first denominator;
- and
- encoding, by the encoder circuitry, a second difference value of the chroma offset, wherein the second difference value is equal to a value of a difference between a chroma offset of the target image and a second reference value of the chroma offset, wherein the second reference value is derived by subtracting a value obtained by both multiplying a median value of a maximum pixel value by a chroma weighting factor and shifting to right for at least one binary digit specified by a second denominator for the chroma weighting factor, from the median value.
1 more element
An encoding method, comprising:
- encoding, by encoder circuitry, a first denominator for a luma weighting factor of a target image;
- encoding, by the encoder circuitry, a first difference value that is equal to a value of a difference between the first denominator and a second denominator for a chroma weighting factor of the target image:
- encoding, by the encoder circuitry, a second difference value of the luma weighting factor, wherein the second difference value is equal to a value of a difference between the luma weighting factor and a first reference value of the luma weighting factor, wherein the first reference value is equal to a value obtained by left shift of 1 by at least one binary digit specified by the first denominator;
- encoding, by the encoder circuitry, a third difference value of the chroma weighting factor, wherein the third difference value is equal to a value of a difference between the chroma weighting factor and a second reference value, wherein the second reference value is equal to a value obtained by left shift of 1 by at least one binary digit specified by the second denominator;
- encoding, by the encoder circuitry, a fourth difference value of the chroma offset, wherein the fourth difference value is equal to a value of a difference between a chroma offset and a third reference value of the chroma offset of the target image, wherein the third reference value in derived by subtracting a value obtained by both multiplying a median value of a maximum pixel value by the chroma weighting factor and shifting to right for the at least one binary digit specified by the second denominator, from the median value.
2 more elements
An electronic apparatus, comprising:
- a non-transitory computer readable medium and a processor, the processor is configured to encode:
- data of a first denominator for a luma weighting factor;
- data of a first difference value that is equal to a value of a difference between the first denominator and a second denominator for a chroma weighting factor;
- data of a second difference value of the luma weighting factor, wherein the second difference value is equal to a value of a difference between the luma weighting factor and a first reference value, and the first reference value is equal to a value obtained by left shift of 1 by at least one binary digit specified by the first denominator;
- data of a third difference value of the chroma weighting factor, wherein the third difference value is equal to a value of a difference between the chroma weighting factor and a second reference value, and the second reference value is equal to a value obtained by left shift of 1 by at least one binary digit specified by the second denominator;
- and
- data of a fourth difference value of a chroma offset, wherein the fourth difference value is equal to a value of a difference between the chroma offset and a third reference value, and the third reference value is equal to a value obtained by subtracting a value obtained by both multiplying a median value of a maximum pixel value by the chroma weighting factor and shifting to right for the at least one binary digit specified by the second denominator, from the median value;
- and
- a transfer circuitry that transfers the encoded data.
6 more elements
Dependencies are inferred from the claim text.