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US 2003/0164983 A1Published application
Image processing method and apparatus
AssigneeCanon Kabushiki Kaisha
InventorsAkitoshi Yamada, Kentaro Yano, Masao Kato, Fumitaka Goto
Life of this patent
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Abstract
Upon outputting halftone image data to an output device, density transformation is prevalently done to improve image quality. Density transformation corresponds to linear gamma correction, and cannot correct any color fog and the like of a photo image. Hence, lightness/color difference information of halftone image data is acquired on the basis of low-frequency components of frequency data obtained by transforming halftone image data into spatial frequency components, and a lightness/color difference transform amount of the halftone image data is set on the basis of the acquired lightness/color difference information.
Claims27
An image processing apparatus comprising:
- an obtaining section, arranged to acquire lightness/color difference information of halftone image data on the basis of low-frequency components of frequency data obtained by transforming the halftone image data into spatial frequency components;
- and
- a setter, arranged to set a lightness/color difference transform amount of the halftone image data on the basis of the acquired lightness/color difference information.
An image processing apparatus comprising:
- an extractor, arranged to extract a feature amount of frequency data obtained by transforming halftone image data into spatial frequency components;
- a determiner, arranged to determine an acquisition method of lightness/color difference information of the halftone image data on the basis of the extracted feature amount;
- an obtaining section, arranged to acquire lightness/color difference information of the halftone image data from the frequency data in accordance with the determination result;
- and
- a setter, arranged to set a lightness/color difference transform amount of the halftone image data on the basis of the acquired lightness/color difference information.
2 more elements
An image processing apparatus comprising:
- a decider, arranged to decide whether or not unit data of frequency data obtained by transforming halftone image data into spatial frequency components contains data which is not contained in the halftone image data;
- a determiner, arranged to determine based on the decision result whether or not lightness/color difference information is acquired from the unit data;
- an obtaining section, arranged to acquire lightness/color difference information from low frequency components of the unit data, acquisition of the lightness/color difference information from which is determined;
- and
- a setter, arranged to set a lightness/color difference transform amount of the halftone image data on the basis of the acquired lightness/color difference information.
2 more elements
An image processing apparatus comprising:
- a decider, arranged to decide whether or not unit data of frequency data obtained by transforming halftone image data into spatial frequency components contains data, which is not contained in the halftone image data;
- a determiner, arranged to determine an acquisition method of lightness/color difference information on the basis of the decision result;
- an obtaining section, arranged to acquire lightness/color difference information from the unit data in accordance with the determination result;
- and
- a setter, arranged to set a lightness/color difference transform amount of the halftone image data on the basis of the acquired lightness/color difference information.
2 more elements
An image processing apparatus comprising:
- a decider, arranged to decide whether or not unit data of frequency data obtained by transforming halftone image data into spatial frequency components contains data, which is not contained in the halftone image data;
- an obtaining section, arranged to acquire lightness/color difference information from low-frequency components of the unit data, and weight the acquired lightness/color difference information on the basis of the decision result;
- and
- a setter, arranged to set a lightness/color difference transform amount of the halftone image data on the basis of the weighted lightness/color difference information.
1 more element
An image processing apparatus comprising:
- an extractor, arranged to extract a feature amount of unit data of frequency data obtained by transforming halftone image data into spatial frequency components;
- a modulator, arranged to modulate lightness/color difference information of the halftone image data acquired from low-frequency components in the unit data on the basis of the extracted feature amount;
- and
- a setter, arranged to set a lightness/color difference transform amount of the halftone image data on the basis of the modulated lightness/color difference information.
1 more element
An image processing method comprising the steps of:
- acquiring lightness/color difference information of halftone image data on the basis of low-frequency components of frequency data obtained by transforming the halftone image data into spatial frequency components;
- and
- setting a lightness/color difference transform amount of the halftone image data on the basis of the acquired lightness/color difference information.
An image processing method comprising the steps of:
- extracting a feature amount of frequency data obtained by transforming halftone image data into spatial frequency components;
- determining an acquisition method of lightness/color difference information of the halftone image data on the basis of the extracted feature amount;
- acquiring lightness/color difference information of the halftone image data from the frequency data in accordance with the determination result;
- and
- setting a lightness/color difference transform amount of the halftone image data on the basis of the acquired lightness/color difference information.
2 more elements
An image processing method comprising the steps of:
- deciding whether or not unit data of frequency data obtained by transforming halftone image data into spatial frequency components contains data which is not contained in the halftone image data;
- determining based on the decision result whether or not lightness/color difference information is acquired from the unit data;
- acquiring lightness/color difference information from low frequency components of the unit data, acquisition of the lightness/color difference information from which is determined;
- and
- setting a lightness/color difference transform amount of the halftone image data on the basis of the acquired lightness/color difference information.
2 more elements
An image processing method comprising the steps of:
- deciding whether or not unit data of frequency data obtained by transforming halftone image data into spatial frequency components contains data which is not contained in the halftone image data;
- determining an acquisition method of lightness/color difference information on the basis of the decision result;
- acquiring lightness/color difference information from the unit data in accordance with the determination result;
- and
- setting a lightness/color difference transform amount of the halftone image data on the basis of the acquired lightness/color difference information.
2 more elements
An image processing method comprising the steps of:
- deciding whether or not unit data of frequency data obtained by transforming halftone image data into spatial frequency components contains data which is not contained in the halftone image data;
- acquiring lightness/color difference information from low frequency components of the unit data, and weighting the acquired lightness/color difference information on the basis of the decision result;
- and
- setting a lightness/color difference transform amount of the halftone image data on the basis of the weighted lightness/color difference information.
1 more element
An image processing method comprising the steps of:
- extracting a feature amount of unit data of frequency data obtained by transforming halftone image data into spatial frequency components;
- modulating lightness/color difference information of the halftone image data acquired from low-frequency components in the unit data on the basis of the extracted feature amount;
- and
- setting a lightness/color difference transform amount of the halftone image data on the basis of the modulated lightness/color difference information.
1 more element
A computer program product storing a computer readable medium having a computer program code, for an image processing method, the product comprising process procedure codes for:
- extracting a feature amount of frequency data obtained by transforming halftone image data into spatial frequency components;
- determining an acquisition method of lightness/color difference information of the halftone image data on the basis of the extracted feature amount;
- acquiring lightness/color difference information of the halftone image data from the frequency data in accordance with the determination result;
- and
- setting a lightness/color difference transform amount of the halftone image data on the basis of the acquired lightness/color difference information.
2 more elements
A computer program product storing a computer readable medium having a computer program code, for an image processing method, the product comprising process procedure codes for:
- deciding whether or not unit data of frequency data obtained by transforming halftone image data into spatial frequency components contains data which is not contained in the halftone image data;
- determining based on the decision result whether or not lightness/color difference information is acquired from the unit data;
- acquiring lightness/color difference information from low frequency components of the unit data, acquisition of the lightness/color difference information from which is determined;
- and
- setting a lightness/color difference transform amount of the halftone image data on the basis of the acquired lightness/color difference information.
2 more elements
A computer program product storing a computer readable medium having a computer program code, for an image processing method, the product comprising process procedure codes for:
- deciding whether or not unit data of frequency data obtained by transforming halftone image data into spatial frequency components contains data which is not contained in the halftone image data;
- determining an acquisition method of lightness/color difference information on the basis of the decision result;
- acquiring lightness/color difference information from low the unit data in accordance with the determination result;
- and
- setting a lightness/color difference transform amount of the halftone image data on the basis of the acquired lightness/color difference information.
2 more elements
A computer program product storing a computer readable medium having a computer program code, for an image processing method, the product comprising process procedure codes for:
- deciding whether or not unit data of frequency data obtained by transforming halftone image data into spatial frequency components contains data which is not contained in the halftone image data;
- acquiring lightness/color difference information from low frequency components of the unit data, and weighting the acquired lightness/color difference information on the basis of the decision result;
- and
- setting a lightness/color difference transform amount of the halftone image data on the basis of the weighted lightness/color difference information.
1 more element
An image processing method comprising the steps of:
- extracting a feature amount of unit data of frequency data obtained by transforming halftone image data into spatial frequency components;
- modulating lightness/color difference information of the halftone image data acquired from low-frequency components in the unit data on the basis of the extracted feature amount;
- and
- setting a lightness/color difference transform amount of the halftone image data on the basis of the modulated lightness/color difference information.
1 more element
An image processing apparatus for processing an image stored in an attached memory card or an image received from a digital camera, comprising:
- an obtaining section, arranged to acquire lightness/color difference information of halftone image data on the basis of low-frequency components of frequency data obtained by transforming the halftone image data into spatial frequency components;
- and
- a setter, arranged to set a lightness/color difference transform amount of the halftone image data on the basis of the acquired lightness/color difference information.
An image processing method for processing an image stored in an attached memory card or an image received from a digital camera, comprising:
- acquiring lightness/color difference information of halftone image data on the basis of low-frequency components of frequency data obtained by transforming the halftone image data into spatial frequency components;
- and
- setting a lightness/color difference transform amount of the halftone image data on the basis of the acquired lightness/color difference information.
Dependencies are inferred from the claim text.