Image coding apparatus, image coding method, image decoding apparatus, image decoding method, and program
AssigneeCanon Kabushiki Kaisha
InventorKoji Okawa
Life of this patent
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Abstract
An image coding apparatus configured to divide an image into one or more slices each including a plurality of blocks and to code each slice on a block-by-block basis includes a first coding unit configured to code blocks included in a first portion of the slice, and a second coding unit configured to code blocks included in a second portion of the slice, wherein, when the second coding unit codes an initial block in the second portion, the second coding unit codes the initial included in the second portion by referring to a first quantization parameter provided to the slice as an initial value and referred to by the first coding unit when the first coding units codes the initial block in the first portion.
Claims24
An image coding apparatus comprising:
- an acquisition unit configured to acquire image data;
- and
- a coding unit configured to code the image data using quantization parameters, wherein, the coding unit is configured:
- to code a first quantization parameter of a first line in a slice including a plurality of blocks using a slice quantization parameter provided to the slice;
- to code a second quantization parameter of the first line using the first quantization parameter of the first line;
- and
- to code a first quantization parameter of a second line in the slice using the slice quantization parameter.
An image decoding apparatus comprising:
- a derivation unit configured to derive quantization parameters;
- and
- a decoding unit configured to decode coded data using the quantization parameters, wherein, the derivation unit is configured:
- to derive a first quantization parameter of a first line in a slice including a plurality of blocks using a slice quantization parameter provided to the slice;
- to derive a second quantization parameter of the first line using the first quantization parameter of the first line;
- and
- to derive a first quantization parameter of a second line in the slice using the slice quantization parameter.
An image coding method comprising:
- acquiring image data;
- and
- coding the image data using quantization parameters, wherein, the coding is configured:
- to code a first quantization parameter of a first line in a slice including a plurality of blocks using a slice quantization parameter provided to the slice;
- to code a second quantization parameter of the first line using the first quantization parameter of the first line;
- and
- to code a first quantization parameter of a second line in the slice using the slice quantization parameter.
An image decoding method comprising:
- deriving quantization parameters;
- and
- decoding coded data using the quantization parameters, wherein, the deriving is configured:
- to derive a first quantization parameter of a first line in a slice including a plurality of blocks using a slice quantization parameter provided to the slice;
- to derive a second quantization parameter of the first line using the first quantization parameter of the first line;
- and
- to derive a first quantization parameter of a second line in the slice using the slice quantization parameter.
A non-transitory computer-readable storage medium storing a program that causes a computer to execute an image coding method comprising:
- acquiring image data;
- and
- coding the image data using quantization parameters, wherein, the coding is configured:
- to code a first quantization parameter of a first line in a slice including a plurality of blocks using a slice quantization parameter provided to the slice;
- to code a second quantization parameter of the first line using the first quantization parameter of the first line;
- and
- to code a first quantization parameter of a second line in the slice using the slice quantization parameter.
A non-transitory computer-readable storage medium storing a program that causes a computer to execute an image decoding method comprising:
- deriving quantization parameters;
- and
- decoding coded data using the quantization parameters, wherein, the deriving is configured:
- to derive a first quantization parameter of a first line in a slice including a plurality of blocks using a slice quantization parameter provided to the slice;
- to derive a second quantization parameter of the first line using the first quantization parameter of the first line;
- and
- to derive a first quantization parameter of a second line in the slice using the slice quantization parameter.
Dependencies are inferred from the claim text.