Noise-reducing image sensor having light receiving elements
In an embodiment example of the present invention, an image sensor comprises a filter used for an extraction of a specific color component of an incident light, a light receiving element which observes the incident light via the filter, a compensating filter having a transmission restraining characteristic in a visible light wavelength range and a transmission characteristic in a wavelength range on a longer wavelength out of the visible light wavelength range, and a compensating light receiving element which observes the incident light via the compensating filter for compensating an observation result by the light receiving element.
1. An image sensor comprising:
a filter used for an extraction of a specific color component of an incident light: a light receiving element which observes the incident light via the filter: a compensating filter having a transmission restraining characteristic in a visible light wavelength range and a transmission characteristic in a wavelength range on a longer wavelength out of the visible light wavelength range: and a compensating light receiving element which observes the incident light via the compensating filter for compensating an observation result by the light receiving element,
wherein the filter comprises:
a yellow filter used for an extraction of a yellow component:
a magenta filter used for an extraction of a magenta component: and
a cyan filter used for an extraction of a cyan component, the light receiving element comprises:
a yellow light receiving element which observes the incident light via the yellow filter:
a magenta light receiving element which observes the incident light via the magenta filter; and
a cyan light receiving element which observes the incident light via the cyan filter, the compensating filter is formed by optically superimposing a cyan component and a red component, and
the image sensor further comprises:
a yellow calculation unit which calculates a compensated yellow observation data value by subtracting an observation data value observed by the compensating light receiving element from an observation data value observed by the yellow light receiving element;
a magenta calculation unit which calculates a compensated magenta observation data value by subtracting an observation data value observed by the compensating light receiving element from an observation data value observed by the magenta light receiving element;
a cyan calculation unit which calculates a compensated cyan observation data value by subtracting an observation data value observed by the compensating light receiving element from an observation data value observed by the cyan light receiving element; and
a three primary color calculation unit which calculates a blue observation data value, a green observation data value and a red observation data value as the three primary colors of a light based on the compensated yellow observation data value, the compensated magenta observation data value and the compensated cyan observation data value.
2. The image sensor according to claim 1 , wherein the yellow filter, the magenta filter, the cyan filter, and the correcting filter are disposed in a rectangular arrangement so as to form a plane for forming a unit of a color separation.
3. An image sensor comprising:
a filter used for an extraction of a specific color component of an incident light:
a light receiving element which observes the incident light via the filter:
a compensating filter having a transmission restraining characteristic in a visible light wavelength range and a transmission characteristic in a wavelength range on a longer wavelength out of the visible light wavelength range; and
a compensating light receiving element which observes the incident light via the compensating filter for compensating an observation result by the light receiving element
wherein the filter comprises:
a yellow filter used for an extraction of a yellow component:
a magenta filter used for an extraction of a magenta component; and
a cyan filter used for an extraction of a cyan component
the light receiving element comprises:
a yellow light receiving element which observes the incident light via the yellow filter;
a magenta light receiving element which observes the incident light via the magenta filter; and
a cyan light receiving element which observes the incident light via the cyan filter
the compensating filter is formed by optically superimposing a cyan component and a red component, and
the image sensor further comprises lenses which are disposed on a light incident region of the filter and the compensating filter, and which restrain a transmittance in an infrared range on a boundary region with respect to the visible light wavelength range.
4. An image sensor comprising:
a filter used for an extraction of a specific color component of an incident light:
a light receiving element which observes the incident light via the filter:
a compensating filter having a transmission restraining characteristic in a visible light wavelength range and a transmission characteristic in a wavelength range on a longer wavelength out of the visible light wavelength range; and
a compensating light receiving element which observes the incident light via the compensating filter for compensating an observation result by the light receiving element
wherein the filter comprises:
a yellow filter used for an extraction of a yellow component:
a magenta filter used for an extraction of a magenta component; and
a cyan filter used for an extraction of a cyan component
the light receiving element comprises:
a yellow light receiving element which observes the incident light via the yellow filter:
a magenta light receiving element which observes the incident light via the magenta filter; and
a cyan light receiving element which observes the incident light via the cyan filter
the compensating filter is formed by optically superimposing a cyan component and a red component, and
the image sensor further comprises a resin layer which is disposed on at least one of a light incident side and a light output side of the filter and the compensating filter, and which restrains a transmittance in an infrared range on a boundary region with respect to the visible light wavelength range.
5. An image sensor comprising:
a filter used for an extraction of a specific color component of an incident light:
a light receiving element which observes the incident light via the filter:
a compensating filter having a transmission restraining characteristic in a visible light wavelength range and a transmission characteristic in a wavelength range on a longer wavelength out of the visible light wavelength range; and
a compensating light receiving element which observes the incident light via the compensating filter for compensating an observation result by the light receiving element
wherein the filter comprises:
a yellow filter used for an extraction of a yellow component:
a magenta filter used for an extraction of a magenta component; and
a cyan filter used for an extraction of a cyan component
the light receiving element comprises:
a yellow light receiving element which observes the incident light via the yellow filter:
a magenta light receiving element which observes the incident light via the magenta filter; and
cyan light receiving element which observes the incident light via the cyan filter
the compensating filter is formed by optically superimposing a cyan component and a red component, and
a coloring material which restrains a transmittance in an infrared range on a boundary region with respect to the visible light wavelength range is added to the yellow filter and the magenta filter.