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US 2007/0182836 A1Published application
Method of calculating ratio of visible light component and image pickup apparatus using same
AssigneeCanon Kabushiki Kaisha
InventorShunsuke Chino
Life of this patent
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Abstract
An image pickup apparatus in which color signals are generated and extracted from a picked-up image signal for a plurality of regions in a screen, a wavelength component ratio is detected and calculated based on the extracted color signals for each of the plurality of regions, one or more regions in which the visible light component ratio calculated is large are selected, and the visible light component ratio of the photographing screen is determined based on the visible light component ratios of the selected regions.
Claims9
An image pickup apparatus comprising:
- an image pickup element that converts an image of an object imaged by a shooting optical system into a picked-up image signal;
- a color filter that is formed on the image pickup element and transmits light in a wavelength region ranging at least from a visible light wavelength region to an infrared wavelength region;
- color signal extraction unit for generating and extracting, from the picked-up image signal, color signals for a plurality of regions in a photographing screen;
- regional wavelength component ratio calculation unit for detecting a wavelength component ratio for each of the plurality of regions based on color signals of the plurality of regions extracted by the color signal extraction unit;
- visible light component ratio determination unit for selecting one or more regions in which the visible light component ratio is large based on the wavelength component ratios calculated by the regional wavelength component ratio calculation unit and determining the visible light component ratio based on a visible light component ratio in the selected regions.
2 more elements
A visible light component ratio calculation method comprising:
- a conversion step of converting an image of an object imaged on an image pickup element having a color filter that transmits light in a wavelength region ranging at least from a visible light wavelength region to an infrared wavelength region, into a picked-up image signal;
- a color signal extraction step of generating and extracting, from the picked-up image signal, color signals for a plurality of regions in a photographing screen;
- a wavelength component ratio detection step of detecting a wavelength component ratio for each of the plurality of regions based on the color signals of the plurality of regions extracted by the color signal extraction unit;
- a selection step of selecting one or more regions in which the visible light component ratio is large from the plurality of regions;
- and
- a determination step of determining the visible light component ratio of the photographing screen based on a visible light component ratio in the selected regions.
3 more elements
Dependencies are inferred from the claim text.