Multiscale adaptive system for enhancement of an image in X-ray angiography
AssigneeSiemens Corporate Research, Inc.
InventorsZhenyu Wu, Ming Fang
Life of this patent
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Abstract
A multi-scale approach to enhancement is taken where enhancement masks are generated at different scales and then combined together using a pyramid scheme. Each mask is computed from applying directional sensitive Laplacian kernels, which is responsible for extracting images of low contrast, followed by an adaptive non-linear mapping. This non-linearity is crucial in virtually eliminating edge overshoots. Furthermore, the input image may also be preprocessed by an edge-preserving smoothing filter to reduce the noise effect.
Claims18
A multiscale adaptive system for enhancement of an image in x-ray angiography comprising:
- an image acquisition system for acquiring an input image;
- an image contrast enhancement system connected to said image acquisition system for utilizing a multiscale approach to enhancement;
- a display mapping system connected to said image contrast enhancement system for modifying pixel values such that relevant image information is presented in an optimal way;
- and,
- an image display apparatus connected to said display mapping system for presenting an enhanced image;
- wherein said image contrast enhancement system comprises:
- a pyramid system wherein a pyramid of intensity images are generated at pyramid levels from said input image;
- an enhancement mask generator wherein enhancement masks of said intensity images are generated at each of said pyramid levels;
- a combination system wherein said enhancement masks are combined together to form a single composite mask;
- and,
- an enhanced image generator wherein said single composite mask is combined with said input image to form an enhanced image.
A multiscale adaptive system for enhancement of an image in x-ray angiography comprising:
- an image contrast enhancement system for utilizing a multiscale approach to enhancement wherein said image contrast enhancement system comprises:
- a pyramid system wherein a pyramid of intensity images are generated at pyramid levels from an input image;
- an enhancement mask generator wherein enhancement masks of said intensity images are generated at each of said pyramid levels;
- a combination system wherein said enhancement masks are combined together to form a single composite mask;
- and,
- an enhanced image generator wherein said single composite mask is combined with said input image to form an enhanced image.
A multiscale adaptive method for enhancing an image in x-ray angiography comprising the steps of:
- acquiring an input image;
- enhancing said input image through a multiscale approach;
- performing display mapping to modify pixel values such that relevant image information is presented in an optimal way;
- and,
- displaying said enhanced image;
- wherein enhancing said input image comprises the steps of:
- generating a pyramid of intensity images at pyramid levels from said input image;
- generating enhancement masks from said intensity images at each of said pyramid levels;
- first combining said enhancement masks together to form a single composite mask;
- and,
- second combining said single composite mask with said input image to form an enhanced image.
Dependencies are inferred from the claim text.