Colorimetric apparatus and colorimetric method
AssigneeCanon Kabushiki Kaisha
InventorMasato Eiyama
Life of this patent
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Abstract
In an apparatus including an irradiation unit capable of irradiating a sheet with at least either visible light or ultraviolet light, and an acquisition unit which acquires a spectral reflectance for each of a plurality of wavelength regions based on light reflected by the sheet, a spectral reflectance acquired by the acquisition unit when the sheet is irradiated with the visible light is stored in a memory unit. A storing unit stores, in the memory unit, a spectral reflectance in a wavelength region shorter than a predetermined wavelength among spectral reflectances acquired by the acquisition unit when the sheet is irradiated with both the visible light and the ultraviolet light.
Claims9
A colorimetric apparatus comprising:
- an irradiation unit configured to be able to irradiate a sheet with at least one of visible light and ultraviolet light;
- an acquisition unit configured to acquire a spectral reflectance for each of a plurality of wavelength regions based on light reflected by the sheet;
- a memory unit;
- and
- a storing unit configured to store, in said memory unit, a spectral reflectance acquired by said acquisition unit in a case where the sheet is irradiated with the visible light,
- wherein said storing unit stores, in said memory unit, a spectral reflectance in a wavelength region shorter than a predetermined wavelength among spectral reflectances acquired by said acquisition unit in a case where the sheet is irradiated with both the visible light and the ultraviolet light.
A colorimetric apparatus comprising:
- an irradiation unit configured to be able to irradiate a sheet with at least one of visible light and ultraviolet light;
- an acquisition unit configured to acquire a spectral reflectance for each of a plurality of wavelength regions based on light reflected by the sheet;
- a memory unit;
- and
- a storing unit configured to store, in said memory unit, a spectral reflectance acquired by said acquisition unit in a case where the sheet is irradiated with both the visible light and the ultraviolet light, and store, in said memory unit, a spectral reflectance in a wavelength region shorter than a predetermined wavelength among spectral reflectances acquired by said acquisition unit in a case where the sheet is irradiated with the visible light.
A colorimetric method comprising:
- a first acquisition step of acquiring a spectral reflectance for each of a plurality of predetermined wavelength regions based on light reflected by a sheet in a case where the sheet is irradiated with visible light;
- a first storing step of storing, in a memory unit, a spectral reflectance acquired in the first acquisition step;
- a second acquisition step of acquiring a spectral reflectance for each of the plurality of wavelength regions based on light reflected by the sheet in a case where the sheet is irradiated with both visible light and ultraviolet light;
- and
- a second storing step of storing, in the memory unit, a spectral reflectance in a wavelength region shorter than a predetermined wavelength among spectral reflectances acquired in the second acquisition step.
A colorimetric method comprising:
- a first acquisition step of acquiring a spectral reflectance for each of a plurality of predetermined wavelength regions based on light reflected by a sheet in a case where the sheet is irradiated with both visible light and ultraviolet light;
- a first storing step of storing, in a memory unit, a spectral reflectance acquired in the first acquisition step;
- a second acquisition step of acquiring a spectral reflectance for each of the plurality of wavelength regions based on light reflected by the sheet in a case where the sheet is irradiated with visible light;
- and
- a second storing step of storing, in the memory unit, a spectral reflectance in a wavelength region shorter than a predetermined wavelength among spectral reflectances acquired in the second acquisition step.
Dependencies are inferred from the claim text.