Method of dynamic range compression of an X-ray image and appara

Details Method of dynamic range compression of an X-ray image and appara Method of dynamic range compression of an X-ray image and appara

1991-10-22

1994-10-18

Dzierzynski, Paul M.

X-ray or gamma ray systems or devices

Specific application

Absorption

36441317, 36441322, G01N 2304

Patent

active

053575490

ABSTRACT:
The dynamic range of density or intensity values of pixels in an X-ray image is compressed in a manner preserving the range which is of primary interest for diagnosis, while still allowing recognition of detailed structure in the further ranges. This is accomplished by forming low-pass picture values (L) from input-picture values (E), determining equalizing values as a function (C) of the low-pass picture values (L) and forming output picture values by superposition of the input-picture values (E) and the equalizing values (C) . The equalizing values are chosen such that the output picture values are greater than the input-picture values (E) at relatively small low-pass picture values (L), below the range of primary interest, and the output picture values are less than the input-picture values at relatively large low-pass picture values (L), above the range of primary interest. Further, the output picture values substantially equal the input picture values for low-mass picture values (L) within the range of primary interest for diagnosis.

REFERENCES:
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patent: 4675893 (1987-06-01), Duinker et al.
patent: 4749257 (1988-06-01), Klausz
patent: 4839805 (1989-06-01), Pearson, Jr. et al.
patent: 4852002 (1989-07-01), Klausz
patent: 4918534 (1990-04-01), Lam et al.
patent: 5042077 (1991-08-01), Burke

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