Tone-scale generation method and apparatus for digital x-ray ima

Details Tone-scale generation method and apparatus for digital x-ray ima Tone-scale generation method and apparatus for digital x-ray ima

1990-02-06

1991-09-03

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 6, 358461, G06K 936

Patent

active

050461184

ABSTRACT:
In any digital imaging system, the digital input signals must be converted to a visible image on some output material or medium. Because the range of this output medium is usually not the same as the input image range, care must be taken in converting the digital input signals into output signals. This conversion is done via the tone-scale transformation function. The type of tone-scale transformation function used largely determines the quality of the output image. A well designed tone-scale transformation function must ensure good contrast, no clipping and the display of the minimum and maximum densities that are present in the input. This invention deals with a reliable and robust technique of generating the tone-scale transformation function for digital projection X-ray input images. The method is based on the histogram entropy of the input image.

REFERENCES:
patent: 4302672 (1981-11-01), Kato et al.
patent: 4641267 (1987-02-01), Asai et al.
patent: 4887305 (1989-12-01), Shimura
patent: 4937682 (1990-06-01), Dalton
"A New Method for Grey-Scale Picture Thresholding Using the Entropy of the Histogram", by J. N. Kapur et al., Computer Vision, Guidelines and Image Processing, 273-285, 1985.
Entropic Thresholding a New Approach by T. Pern, Computer Graphic & Imaging Processing, 16, 1981, pp. 210-239.

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