Image coding apparatus and image decoding apparatus
AssigneeSharp Kabushiki Kaisha
InventorsHiroyuki Katata, Hiroshi Kusao, Tomoko Aono, Norio Ito, Shuichi Watanabe
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Abstract
An image coding apparatus inputs pixel data of a part image of high resolution. An upper layer coding portion (101), a second shape data generating portion (102), and a second shape data coding portion (103) perform coding of shape data and pixel data in the upper layer. A down sampling portion (104) generates pixel data of low resolution. A lower layer coding portion (105), a first shape data generating portion (106), and a first shape data coding portion (107) code shape data and pixel data in the lower layer.
Claims10
An image coding apparatus performing lower layer coding for coding a part image in arbitrary shape in low resolution and upper layer coding for coding the part image in high resolution, comprising:
- a first shape data generating portion (106) for generating low-resolution shape data representing the arbitrary shape;
- a first shape data coding portion (107) for coding the generated low-resolution shape data;
- a second shape data generating portion (102) for generating high-resolution shape data representing the arbitrary shape;
- and
- a second shape data coding portion (103) for coding the generated high-resolution shape data;
- wherein
- said low-resolution shape data are used for coding the part image in the lower layer, and said high-resolution shape data and said decoded part image data in the lower layer are used for coding the part image in the upper layer.
An image coding apparatus performing lower layer coding for coding a part image in arbitrary shape in low resolution and upper layer coding for coding the part image in high resolution, wherein
- high-resolution shape data of said part image are shared by the upper and lower layers;
- the image coding apparatus comprising:
- a high-resolution shape data generating portion for generating high-resolution shape data of said part image;
- and
- a shape data coding portion (105) for coding the generated high-resolution shape data;
- wherein
- said high-resolution shape data having N levels of gradation (N is at least 2) are transformed to low-resolution shape data having M (M>N) levels of gradation,
- said low-resolution shape data are used for coding the part image in the lower layer, and
- said high-resolution shape data and decoded part image data in the lower layer are used for coding the part image in the upper layer.
Dependencies are inferred from the claim text.