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US 7,065,263 B2Granted
Image processing apparatus, image input/output apparatus, scaling method and memory control method
AssigneeCanon Kabushiki Kaisha
InventorKoichi Ueda
Life of this patent
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Abstract
The present invention relates to an image processing apparatus, an image input/output apparatus, a scaling method and a memory control method, by which input image data is written to an external memory in tiles, the tiles written to the external memory are read, and the read-out tiles are scaled.
Claims2
An image processing apparatus for performing scaling on inputted image data, the apparatus comprising:
- a write unit for writing the inputted image data to an external memory in tile image units;
- a read unit for reading the tile images written to the external memory;
- a scaling unit for scaling on the tile images read by the read unit;
- and
- an exclusive controller unit for controlling access to the external memory by the read unit and the write unit,
- the exclusive controller unit setting a number of tile images in a vertical direction to be managed in the external memory being at least (1/n)+2 when a designated vertical direction scaling rate is n (n<1) when accessing the external memory in the read step and the write step.
3 more elements
A memory control method for an image processing apparatus for performing scaling on inputted image data, the method comprising the steps of:
- writing the inputted image data to an external memory in tile image units;
- reading the tile images written to the external memory;
- performing scaling on the tile images read in the preceding read step;
- and
- exclusively controlling access to the external memory in the read step and the write step,
- the exclusive control access step setting a number of tile images in a vertical direction to be managed in the external memory being at least (1/n)+2 when designated vertical direction scaling rate is n (n<1) when accessing the external memory in the read step and the write step.
3 more elements
Dependencies are inferred from the claim text.