Hue preservation
First Claim
Patent Images
1. A method, comprising:
- acquiring a plurality of color component signals from pixels in a photoelectric device, wherein ratios among the plurality of color component signals correspond to hues of an illuminated image;
detecting over-illumination capable of distorting the hues, on a pixel-by-pixel basis; and
preserving the ratios among the color component signals while correcting the over-illumination on a pixel-by-pixel basis.
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Abstract
A method and apparatus for hue preservation under digital exposure control by preserving color component ratios on a pixel by pixel basis.
66 Citations
20 Claims
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1. A method, comprising:
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acquiring a plurality of color component signals from pixels in a photoelectric device, wherein ratios among the plurality of color component signals correspond to hues of an illuminated image;
detecting over-illumination capable of distorting the hues, on a pixel-by-pixel basis; and
preserving the ratios among the color component signals while correcting the over-illumination on a pixel-by-pixel basis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus, comprising:
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an analog-to-digital converter (ADC) to receive a plurality of electrical signals from a photoelectric device, the ADC to generate a corresponding plurality of digital signals, each digital signal having a value proportional to a color component of light incident on the photoelectric device; and
a signal processor coupled to the ADC to receive the plurality of digital signals, to apply gain to the plurality of digital signals to obtain brightness adjusted digital signals, to determine whether one or more of the brightness adjusted digital signals exceeds an output limit, and to reduce the brightness adjusted digital signals to preserve ratios of values of the plurality digital signals. - View Dependent Claims (15, 16, 17)
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18. An article of manufacture, comprising a machine-accessible medium including data that, when accessed by a machine, cause the machine to perform operations comprising a method, the method comprising:
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acquiring color components from pixels of a digital image, each color component having a range from zero to a maximum value;
multiplying each color component by a common factor to obtain a plurality of amplified color components;
determining that one or more of the amplified color components is greater than the maximum value; and
replacing each amplified color component with a corrected color component. - View Dependent Claims (19, 20)
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Specification