Image forming with decompression processing for band data of first and second color components
AssigneeCanon Kabushiki Kaisha
InventorKenji Kasuya
Life of this patent
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Abstract
Image data stored in a spool memory and respectively corresponding to a plurality of colors is read and sequentially decompressed, and image forming processing is performed based on the decompressed image data. In the decompression, the image data respectively corresponding to the plurality of colors is sequentially decompressed, switching between decompression target data in units of bands.
Claims16
An image forming apparatus, comprising:
- a spool memory configured to store compressed image data of a plurality of color components including a first color component and a second color component;
- a first controller, comprising at least one processor which executes instructions stored in at least one memory and/or at least one circuit, being configured to:
- cause a decompression unit to decompress the compressed image data stored in the spool memory;
- and
- a second controller, comprising at least one processor which executes instructions stored in at least one memory and/or at least one circuit, being configured to:
- receive the decompressed image data and perform image analysis processing on the received decompressed image data,
- wherein the first controller is configured to (a) cause the decompression unit to decompress first area data of the first color component of an area of a page, and then (b) cause the decompression unit to decompress second area data of the second color component of the area of the page, and then (c) cause the decompression unit to decompress third area data of the first color component of a next area of the page, and then (d) cause the decompression unit to decompress fourth area data of the second color component of the next area of the page, and
- wherein the second controller starts the image analysis processing based on receiving the decompressed first area data and the decompressed second area data before receiving the decompressed third area data and the decompressed fourth area data.
An image forming method that is executed in an image forming apparatus equipped with a spool memory for storing compressed image data of a plurality of color components including a first color component and a second color component, the method comprising:
- causing a decompression unit to decompress the compressed image data stored in the spool memory;
- and
- receiving the decompressed image data and performing image analysis processing on the received decompressed image data,
- wherein the decompressing comprises (a) causing the decompression unit to decompress first area data of the first color component of an area of a page, and then (b) causing the decompression unit to decompress second area data of the second color component of the area of the page, and then (c) causing the decompression unit to decompress third area data of the first color component of a next area of the page, and then (d) causing the decompression unit to decompress fourth area data of the second color component of the next area of the page,
- wherein the image analysis processing is started based on receiving the decompressed first area data and the decompressed second area data before receiving the decompressed third area data and the decompressed fourth area data.
Dependencies are inferred from the claim text.