Methods for adapative spectral, spatial and temporal sensing for imaging applications
First Claim
1. A method of adaptive spectral sensing for a two-dimensional image comprising picture elements, said method comprising:
- a) illuminating at least one of said picture elements with an input light;
b) deriving a time-varying spectral signal from said input light for said picture element;
c) processing said time-varying spectral signal with a time-varying reference signal to obtain a processed output value for said picture element;
d) employing said processed output value for determining a spectral characteristic of said input light.
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Abstract
A method for adaptive spectral sensing developed for a two-dimensional image made up of picture elements. The method calls for illuminating at least one of the picture elements with an input light and deriving a time-varying spectral signal from the input light for that picture element. The time-varying spectral signal is processed with a time-varying reference signal by using a mathematical function such as convolution, multiplication, averaging, integrating, forming an inner product, matched filtering, addition, subtraction or division to obtain a processed output value for the picture element and this output value is then used in determining a spectral characteristic of the input light. The time-varying spectral signal is conveniently derived by optical filtering of the input light yielding an optical time-varying spectral signal. This method can be used by itself or in combination with at least one other adaptive technique such as adaptive spatial sensing and/or adaptive temporal sensing.
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Citations
23 Claims
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1. A method of adaptive spectral sensing for a two-dimensional image comprising picture elements, said method comprising:
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a) illuminating at least one of said picture elements with an input light;
b) deriving a time-varying spectral signal from said input light for said picture element;
c) processing said time-varying spectral signal with a time-varying reference signal to obtain a processed output value for said picture element;
d) employing said processed output value for determining a spectral characteristic of said input light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of adaptive spatial sensing for a two-dimensional image comprising picture elements, said method comprising:
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a) illuminating at least two of said picture elements with an input light;
b) scanning a projection of said at least two picture element across a spectral detector element to obtain scan response signals from said at least two picture elements;
c) processing said scan response signals with a reference signal to obtain a processed output value for said at least two picture elements;
d) employing said processed output value for determining a spatial characteristic of said input light. - View Dependent Claims (18, 19, 20, 21)
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22. A method of adaptive temporal sensing for a two-dimensional image comprising picture elements, said method comprising:
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a) illuminating at least one of said picture elements with an input light;
b) deriving a time-varying spectral signal from said input light for said picture element at two different points in time and averaging;
c) processing said time-varying spectral signal with a time-varying reference signal to obtain a processed output value for said picture elements;
d) employing said output value for determining a temporal characteristic of said input light. - View Dependent Claims (23)
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Specification