X-ray or gamma ray systems or devices – Specific application – Absorption
Patent
1997-05-22
1998-12-22
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Absorption
382169, 382251, 382274, 256330, G01N 2304
Patent
active
058526480
ABSTRACT:
A display signal of high contrast is generated by processing an image signal that is acquired from a camera such as an infra-red or X-ray camera. The method involves: dividing a screen into polygons, finding signal intensities of pixels in these polygons by interpolation from the original image signal intensities of pixels corresponding to the vertices of these polygons as a signal intensity LF of a low frequency component; finding the signal intensities HF of high frequency components of these pixels by performing calculation to subtract the signal LF of this low frequency component from the original image signal S at each pixel; finding, for the signal intensities HF of these high frequency components, from a histogram showing the rate of occurrence numbers of the respective signal intensities, a transformation function IHS including the integrated values of these rate of occurrence numbers up to respective signal intensities; transforming the signal intensities of the high frequency components HF into display signal intensities DHF in accordance with this transformation function IHS; and finding the display signal DP of these pixels by adding to the display signals DHF of these high frequency components obtained by this transformation a signal obtained by multiplying the signal of the low frequency component LF by a weighting coefficient .beta. of less than 1.
REFERENCES:
patent: 4754332 (1988-06-01), Bergquist
patent: 5450502 (1995-09-01), Eschbach et al.
patent: 5644661 (1997-07-01), Smith et al.
patent: 5724456 (1998-03-01), Boyack et al.
Dohi Masaji
Miyamoto Yoshihiro
Bruce David Vernon
Fujitsu Ltd.
Porta David P.
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