Method and system for dual-envelope image enhancement
First Claim
Patent Images
1. A signal-processing system comprising:
- input means for receiving an input image signal Sin;
output means for outputting an enhance image signal; and
a processing component thatcomputes upper-envelope and lower-envelope functions U and L with respect to the input image signal Sin;
modifies the upper-envelope and lower-envelope functions U and L to produce a modified upper-envelope function U′ and
a modified lower-envelope function L′
; and
employs the modified upper-envelope function U′ and
the modified lower-envelope function L′
to generate an enhanced output image.
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Abstract
Various embodiments of the present invention are directed to methods and systems for processing signals, particularly signals encoding two-dimensional images, such as photographs, video frames, graphics, and other visually displayed information. In various method embodiments of the present invention, an input image signal is decomposed into an upper-envelope function, a lower-envelope function, and a details function. One or both of the upper-envelope and lower-envelope functions are then modified to produce one or more image-enhancing effects when the modified upper-envelope and lower-envelope functions are recombined with the details function to produce an enhanced image signal.
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20 Claims
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1. A signal-processing system comprising:
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input means for receiving an input image signal Sin; output means for outputting an enhance image signal; and a processing component that computes upper-envelope and lower-envelope functions U and L with respect to the input image signal Sin; modifies the upper-envelope and lower-envelope functions U and L to produce a modified upper-envelope function U′ and
a modified lower-envelope function L′
; andemploys the modified upper-envelope function U′ and
the modified lower-envelope function L′
to generate an enhanced output image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 20)
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13. A method for enhancing an input image signal Sin, the method comprising:
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computing upper-envelope and lower-envelope functions U and L with respect to the input image signal Sin; modifying the upper-envelope and lower-envelope functions U and L to produce a modified upper-envelope function U′ and
a modified lower-envelope function L′
; andemploying the modified upper-envelope function U′ and
the modified lower-envelope function L′
to generate an enhanced output image. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification