Luminance-priority electronic color image sensor
First Claim
1. A luminance priority color sensor comprising:
- a semiconductor substrate having a plurality of sensing elements disposed on the semiconductor substrate, where each sensing element comprises;
at least one color sensing layer disposed outwardly from the semiconductor substrate, wherein the color sensing layer is operable to measure an intensity of light within a frequency band corresponding to at least one color of light; and
a luminance sensing layer disposed outwardly from the at least one color sensing layer, wherein the luminance sensing layer is operable to measure luminance.
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Abstract
In luminance priority multilayer color film, one of the layers substantially matches the luminance sensitivity of the human eye. This luminance layer distinguishes from prior art color films that have a blue, a green, and a red sensitive layer. This luminance layer has the priority front position to sense light before being diffused and attenuated by other layers, giving the luminance record enhanced speed and clarity compared to prior art blue-priority color film. In another embodiment, a layered CCD sensor has a top silicon layer that is sensitive to all colors, followed by a yellow filter, a second silicon layer responsive to green and red light only because of the yellow filter, a cyan filter, and a bottom silicon layer receiving only green light. An image from a luminance-priority color sensor inputs to a color space conversion to recover full color. In the preferred embodiment, a luminance layer on top maps to a luminance “Y” value, and underlying color sensitive layers are used in conjunction with the luminance to derive the “U” and “V” chrominance vectors of YUV color space.
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Citations
20 Claims
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1. A luminance priority color sensor comprising:
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a semiconductor substrate having a plurality of sensing elements disposed on the semiconductor substrate, where each sensing element comprises;
at least one color sensing layer disposed outwardly from the semiconductor substrate, wherein the color sensing layer is operable to measure an intensity of light within a frequency band corresponding to at least one color of light; and
a luminance sensing layer disposed outwardly from the at least one color sensing layer, wherein the luminance sensing layer is operable to measure luminance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
a red-green color sensing layer operable to measure an intensity of light within the red and green frequency bands; and
a green color sensing layer operable to measure an intensity of light within the green frequency band.
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11. The luminance priority color sensor of claim 1, wherein the at least one color sensing layer comprises:
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a red-green color sensing layer operable to measure an intensity of light within the red and green frequency bands; and
a red color sensing layer operable to measure an intensity of light within the red frequency band.
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12. The luminance priority color sensor of claim 1, wherein the luminance priority color sensor operates within an imaging system.
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13. The luminance priority color sensor of claim 12, wherein the imaging system comprises a digital camera.
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14. A method of digitizing a scene comprising:
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measuring an intensity of light associated with luminance and outputting luminance data;
measuring an intensity of light associated with at least one color of light to produce color data;
wherein the intensity of light associated with the at least one color of light is measured in at least one color sensing layer and the intensity of light associated with luminance is simultaneously measured in a luminance layer superimposed over the at least one color sensing layer; and
processing the luminance data and color data to produce values representative of the red, green and blue color components of each pixel within the scene. - View Dependent Claims (15, 16, 17, 18, 19, 20)
a red-green color sensing layer operable to measure the intensity of light associated with red and green light; and
a green color sensing layer superimposed under the red-green color sensing layer wherein the green sensing layer is operable to measure the intensity of light associated with green light.
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16. The method of claim 15, wherein processing the luminance data and color data to produce values representative of the red, green, and blue components of each pixel within the scene comprises:
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calculating the blue component by subtracting the red-green data from the luminance data;
calculating the red component by subtracting the green data from the red-green data; and
the green component is directly measured.
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17. The method of claim 16, further comprising processing the red, green, and blue components of each pixel to adjust for luminance.
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18. The method of claim 14, wherein at least one color sensing layer comprises:
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a red-green color sensing layer operable to measure the intensity of light associated with red and green light; and
a red color sensing layer superimposed under the red-green color sensing layer wherein the red sensing layer is operable to measure the intensity of light associated with red light.
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19. The method of claim 14, wherein each color sensing layer includes a filter.
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20. The method of claim 19, wherein the filter comprises a dichroic filter.
Specification