Apparatus for processing an X-ray image

Details Apparatus for processing an X-ray image Apparatus for processing an X-ray image

1988-04-08

1989-07-11

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 54, 358111, G06K 900

Patent

active

048479098

ABSTRACT:
An apparatus for processing an X-ray image, wherein an image signal newly obtained is allowed to pass through a recursive filter so as to allow objectionable lag to occur between that image and a plurality of images previously obtained. On the other hand, two-dimensional smoothing within a signal image is carried out when the image signal is processed in a smoothing circuit. The image signal taken from the recursive filter circuit is mixed with the image signal taken from the smoothing circuit. The mixing ratio for each picture element is determined by a motion detector, which compares each picture element of the present image signal with corresponding picture elements of the previous image signals and thereby detects the motion of each picture element. Thus the noise reduction by smoothing takes place more remarkably in the image of an object moving quickly, while the noise reduction resulting from the lag induced by the recursive filter takes place more remarkably in the image of an object moving slowly.

REFERENCES:
patent: 4409615 (1983-10-01), McMann; Jr. et al.
patent: 4507681 (1985-03-01), Verhoeven et al.
patent: 4607284 (1986-08-01), Raven et al.

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