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US 2006/0067584 A1Published application
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.
Claims28
An image forming apparatus comprising:
- a decompression unit configured to decompress first compressed image data;
- an image processing unit configured to process image data decompressed by the decompression unit;
- a plurality of quantization tables;
- a quantization table selection unit configured to select, from among the plurality of quantization tables, a quantization table providing a compression ratio lower than a compression ratio of the first compressed image data;
- and
- a compression unit configured to compress image data processed by the image processing unit,
- wherein the compression unit forms image data by compressing an image using the quantization table selected by the quantization table selection unit.
4 more elements
An image forming apparatus comprising:
- a decompression unit configured to decompress first compressed image data;
- a quantization table obtaining unit configured to obtain quantization table information of the first compressed image data;
- a trimming unit configured to trim image data obtained by the decompression unit;
- and
- a compression unit configured to compress image data obtained by the trimming unit,
- wherein the compression unit forms image data by compressing an image using a quantization table obtained by the quantization table obtaining unit.
3 more elements
An image forming apparatus comprising:
- a decompression unit configured to decompress first image data compressed in a 422 format of luminance and chrominance signals;
- a rotation unit configured to rotate image data;
- a conversion unit configured to convert image data into a 420 format of luminance and chrominance signals;
- and
- a compression unit configured to compress image data in the 420 format of luminance and chrominance signals,
- wherein the rotation unit rotates image data decompressed by the decompression unit, the conversion unit converts image data obtained by the rotation unit into the 420 format of luminance and chrominance signals, and the compression unit forms an image by compressing image data obtained by the conversion unit in the 420 format of luminance and chrominance signals.
3 more elements
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:
- a decompression step of decompressing first compressed image data;
- an image processing step of processing image data decompressed by the decompression step;
- a providing step of providing a plurality of quantization tables;
- a quantization table selection step of selecting, from among the plurality of quantization tables, a quantization table whose compression ratio is lower than a compression ratio of the first compressed image data;
- and
- a compression step of compressing image data obtained by the image processing step,
- wherein image data is formed by compressing an image in the compression step using the quantization table selected by the quantization table selection step.
4 more elements
An image forming method comprising the following steps:
- a decompression step of decompressing first compressed image data;
- a quantization table obtaining step of obtaining quantization table information of the first compressed image data;
- a trimming step of trimming image data obtained by the decompression step;
- and
- a compression step of compressing image data obtained by the trimming step,
- wherein image data is formed by compressing an image in the compression step using a quantization table obtained by the quantization table obtaining step.
3 more elements
An image forming method comprising the following steps:
- a decompression step of decompressing first image data compressed in a 422 format of luminance and chrominance signals;
- a rotation step of rotating image data;
- a conversion step of converting image data into a 420 format of luminance and chrominance signals;
- and
- a compression step of compressing image data in the 420 format of luminance and chrominance signals,
- wherein image data decompressed by the decompression step is rotated in the rotation step, the image data rotated in the rotation step is converted in the conversion step, and the image data converted in the conversion step is compressed in the compression step.
3 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.