Signal intensity range transformation apparatus and method
First Claim
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1. An apparatus providing an image output signal in response to an image input signal, the device comprising:
- a saturation bias identification circuit having a range of useful grey-levels output responsive to the image input signal; and
a cumulative distribution function scaling circuit having a scaled output responsive to the useful grey-levels output,wherein the range of useful grey-levels output includes all grey-levels within a cumulative distribution function except the first unsaturated grey-level within the cumulative distribution function and the last unsaturated grey-level within the cumulative distribution function.
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Abstract
A system and method for manipulating image data is disclosed. Generally, the system and method identifies useful grey-levels within an input image. The image is then scaled based upon the identified useful grey-levels.
362 Citations
38 Claims
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1. An apparatus providing an image output signal in response to an image input signal, the device comprising:
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a saturation bias identification circuit having a range of useful grey-levels output responsive to the image input signal; and a cumulative distribution function scaling circuit having a scaled output responsive to the useful grey-levels output, wherein the range of useful grey-levels output includes all grey-levels within a cumulative distribution function except the first unsaturated grey-level within the cumulative distribution function and the last unsaturated grey-level within the cumulative distribution function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of providing an image output signal in response to an image input signal comprising the steps of:
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generating a range of useful grey-levels in response to the image input signal; and generating a scaled output in response to the range of useful grey-levels, wherein the step of generating a range of useful grey-levels includes specifying all grey-levels within a cumulative distribution function except the first unsaturated grey-level within the cumulative distribution function and the last unsaturated grey-level within the cumulative distribution function. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification