Wavelength component proportion detection apparatus and image-pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorDaisuke Sasaki
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Abstract
A wavelength component proportion detection apparatus is disclosed which is capable of detecting the proportions of the wavelength components under a light source including the visible and infrared wavelength components. The apparatus comprises a color filter, an image-pickup element, an extractor which extracts a color-difference signal from an image-pickup signal, and a detector which detects, on the basis of the extracted color-difference signal, the proportion of a wavelength component in a first infrared wavelength region and the proportion of a wavelength component in a second infrared wavelength region in the light from the light source.
Claims14
A wavelength proportion detection apparatus comprising:
- a color filter which transmits light from an object irradiated with light from a light source;
- an image-pickup element which outputs an image-pickup signal by converting light in a visible wavelength region and light in an infrared wavelength region transmitted through the color filter into an electrical signal;
- an extractor which extracts a color-difference signal from the image-pickup signal;
- and
- a detector which detects, on the basis of the extracted color-difference signal, the proportion of a wavelength component in a first infrared wavelength region and the proportion of a wavelength component in a second infrared wavelength region in the light from the light source, the first infrared wavelength region being a region in which the transmittance of the color filter for a red wavelength component is higher than the transmittances of the color filter for blue and green wavelength components, and the second infrared wavelength region being a region in which the difference between the transmittance of the color filter for the red wavelength component and the transmittances of the color filter for the blue and green wavelength components is smaller than that in the first infrared wavelength region.
A wavelength proportion detection apparatus comprising:
- a color filter which transmits light from an object irradiated with light from a light source;
- an image-pickup element which outputs an image-pickup signal by converting light in a visible wavelength region and light in an infrared wavelength region transmitted through the color filter into an electrical signal;
- an extractor which extracts a color-difference signal and a luminance signal from the image-pickup signal;
- and
- a detector which detects, on the basis of the ratio of the extracted color-difference signal and luminance signal, the proportion of a wavelength component in a first infrared wavelength region and the proportion of a wavelength component in a second infrared wavelength region in the light from the light source, the first infrared wavelength region being a region in which the transmittance of the color filter for a red wavelength component is higher than the transmittances of the color filter for blue and green wavelength components, and the second infrared wavelength region being a region in which the difference between the transmittance of the color filter for the red wavelength component and the transmittances of the color filter for the blue and green wavelength components is smaller than that in the first infrared wavelength region.
A wavelength proportion detection method using a color filter which transmits light from an object irradiated with light from a light source, and an image-pickup element which outputs an image-pickup signal by converting light in a visible wavelength region and light in an infrared wavelength region transmitted through the color filter into an electrical signal, the method comprising the steps of:
- extracting a color-difference signal from the image-pickup signal;
- and
- detecting, on the basis of the extracted color-difference signal, the proportion of a wavelength component in a first infrared wavelength region and the proportion of a wavelength component in a second infrared wavelength region in the light from the light source, the first infrared wavelength region being a region in which the transmittance of the color filter for a red wavelength component is higher than the transmittances of the color filter for blue and green wavelength components, and the second infrared wavelength region being a region in which the difference between the transmittance of the color filter for the red wavelength component and the transmittances of the color filter for the blue and green wavelength components is smaller than that in the first infrared wavelength region.
A wavelength proportion detection method using a color filter which transmits light from an object irradiated with light from a light source, and an image-pickup element which outputs an image-pickup signal by converting light in a visible wavelength region and light in an infrared wavelength region transmitted through the color filter into an electrical signal, the method comprising the steps of:
- extracting a color-difference signal and a luminance signal from the image-pickup signal;
- and
- detecting, on the basis of the ratio of the extracted color-difference signal and luminance signal, the proportion of a wavelength component in a first infrared wavelength region and the proportion of a wavelength component in a second infrared wavelength region in the light from the light source, the first infrared wavelength region being a region in which the transmittance of the color filter for a red wavelength component is higher than the transmittances of the color filter for blue and green wavelength components, and the second infrared wavelength region being a region in which the difference between the transmittance of the color filter for the red wavelength component and the transmittances of the color filter for the blue and green wavelength components is smaller than that in the first infrared wavelength region.
Dependencies are inferred from the claim text.