Image coding and decoding method and apparatus considering human visual characteristics
AssigneeSamsung Electronics Co., Ltd.Q
InventorsWoo-shik Kim, Dae-sung Cho, Shi-hwa Lee, Sang-wook Kim
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Abstract
An image coding method and apparatus considering human visual characteristics are provided. The image coding method comprises (a) modeling image quality distribution of an input image in units of scenes such that the quality of an image input in units of scenes is gradually lowered from a region of interest to a background region, (b) determining a quantization parameter of each region constituting one scene according to the result of modeling of image quality distribution, (c) quantizing image data in accordance with the quantization parameter, and (d) coding entropy of the quantized image data.
Claims18
An image decoding apparatus comprising:
- an entropy decoding unit which obtains a first quantization parameter for a first plurality of macroblocks from a bitstream, where the first plurality of macroblocks are not located on a boundary of a picture;
- and
- an inverse-quantizing unit which calculates a second quantization parameter for a second plurality of macroblocks in a predefined manner, where the second plurality of macroblocks are located on the boundary of the picture, and inverse-quantizes the first plurality of macroblocks of the picture using the first quantization parameter and the second plurality of macroblocks of the picture using the second quantization parameter, respectively,
- wherein the second quantization parameter is not obtained directly from the bitstream.
An image decoding apparatus comprising:
- an entropy decoding unit which obtains a first quantization parameter for a first plurality of macroblocks from a bitstream, where the first plurality of macroblocks are not located on a boundary of a picture;
- and
- an inverse-quantizing unit which calculates a second quantization parameter for a second plurality of macroblocks in a predefined manner, where the second plurality of macroblocks are located on the boundary of the picture, and inverse-quantizes the first plurality of macroblocks of the picture using the first quantization parameter and the second plurality of macroblocks of the picture using the second quantization parameter, respectively,
- wherein the second quantization parameter as it is, is not included in the bitstream.
An image decoding apparatus comprising:
- an entropy decoding unit which obtains a first quantization parameter for a first plurality of macroblocks from a bitstream, where the first plurality of macroblocks are not located on a boundary of a picture;
- and
- an inverse-quantizing unit which calculates a second quantization parameter for a second plurality of macroblocks in a predefined manner, where the second plurality of macroblocks are located on the boundary of the picture, and inverse-quantizes the first plurality of macroblocks of the picture using the first quantization parameter and the second plurality of macroblocks of the picture using the second quantization parameter, respectively,
- wherein the second quantization parameter is not obtained directly from the bitstream in which the second quantization parameter as it is, is not included.
Dependencies are inferred from the claim text.