Image coding and decoding method and apparatus considering human visual characteristics
AssigneeSamsung Electronics Co., Ltd.
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.
Claims16
An image decoding apparatus comprising:
- an entropy decoding unit which decodes image data including information on a quantization parameter for each macroblock in a bitstream;
- and
- an inverse-quantizing unit which determines respective quantization parameters based on a location of each macroblock and inverse-quantizes each macroblock using the respectively determined quantization parameter, wherein macroblocks located on a boundary of a region are inverse-quantized using a second quantization parameter obtained based on a first quantization parameter, with all other macroblocks of the region being inverse-quantized using the first quantization parameter decoded from the bitstream for macroblocks of the region.
An image decoding apparatus, comprising:
- an entropy decoding unit which decodes image data including information on position and size and a quantization parameter for each macroblock in a bitstream;
- and
- an inverse-quantizing unit which determines a respective quantization parameter based on a location of each macroblock and inverse-quantizes each macroblock using the respectively determined quantization parameter, wherein macroblocks located on a boundary of a region are inverse-quantized using a second quantization parameter obtained based on a first quantization parameter, with all other macroblocks of the region being inverse-quantized using the first quantization parameter decoded from the bitstream for macroblocks of the region.
Dependencies are inferred from the claim text.