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US 7,889,936 B2Granted
Image forming apparatus and image forming method
AssigneeCanon Kabushiki Kaisha
InventorYoshinobu Sato
Life of this patent
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Abstract
An image forming apparatus and method capable of decompressing and compressing image data. More specifically, the apparatus and method include decompressing first compressed image data, processing the decompressed image data, selecting from among a plurality of quantization tables a quantization table providing a compression ratio lower than a compression ratio of the first compressed image data, and compressing the processed image data.
Claims3
An image forming apparatus comprising:
- an image capture unit including a camera lens configured to capture an image of an object;
- a signal processing unit configured to process image data captured by the image capture unit;
- a rotation unit configured to rotate image data processed by the signal processing unit;
- at least two quantization tables;
- a quantization table selection unit configured to select one of the at least two quantization tables;
- and
- a compression unit configured to compress image data,
- wherein the at least two quantization tables includes a first quantization table providing a first compression ratio and a second quantization table providing a compression ratio higher than the first compression ratio,
- wherein the quantization table selection unit selects the second quantization table when the compression unit compresses image data processed by the signal processing unit, and selects the first quantization table when the compression unit compresses image data rotated by the rotation unit, and
- wherein the compression unit forms image data by compressing an image using the quantization table selected by the quantization table selection unit.
7 more elements
An image forming method comprising the following steps:
- an image capture step of capturing an image of an object via a camera lens;
- a signal processing step of processing image data captured by the image capture step;
- a rotation step of rotating image data processed by the signal processing step;
- a quantization table selection step of selecting one of at least two quantization tables;
- and
- a compression step of compressing image data,
- wherein the at least two quantization tables include a first quantization table providing a first compression ratio, and a second quantization table providing a compression ratio higher than the first compression ratio,
- wherein the quantization table selection step selects the second quantization table when image data processed in the signal processing step is compressed, and selects the first quantization table when image data rotated in the rotation step is compressed, and
- wherein the compression step compresses image data using the quantization table selected by the quantization table selection step.
6 more elements
Dependencies are inferred from the claim text.