Image encoder and image decoder
OwnerYoshihisa Yamada, Yoshimi Moriya +1inventors
InventorsYoshihisa Yamada, Yoshimi Moriya, Shunichi Sekiguchi
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Abstract
An image encoder includes a preprocessing unit 1 for dividing an image signal into two-dimensional blocks of a prescribed size, and for deciding, for each of the blocks divided, the type of a region to which the block belongs, and generates compressed data by executing, for each block divided by the preprocessing unit 1, coding processing corresponding to the type of the region decided by the preprocessing unit 1. This makes it possible to execute coding processing suitable for each region in a picture, thereby being able to implement an image encoder capable of improving coding efficiency.
Claims14
An image encoder comprising:
- a block dividing unit for dividing an image signal into two-dimensional blocks of a prescribed size;
- a region type decision unit for deciding, for each block passing through the division by the block dividing unit, as to which type of a region the block belongs to;
- and
- a coding unit for generating compressed data by executing, for each block passing through the division by the block dividing unit, coding processing corresponding to the type of the region decided by the region type decision unit.
An image decoder comprising:
- a region decision resultant signal extracting unit for extracting, from compressed data of a two-dimensional block divided into a prescribed size, a region decision resultant signal indicating a type of a region to which the block belongs;
- and
- a decoding unit for decoding an image signal from the compressed data of the two-dimensional block by executing decoding processing corresponding to the type of the region indicated by the region decision resultant signal extracted by the region decision resultant signal extracting unit.
Dependencies are inferred from the claim text.