X-ray or gamma ray systems or devices – Specific application – Xeroradiography
Patent
1991-08-08
1992-11-10
Hannaher, Constantine
X-ray or gamma ray systems or devices
Specific application
Xeroradiography
378 32, G03G 13044
Patent
active
051630753
ABSTRACT:
The contrast of an electrographic image or a region of interest of an electrographic image having low contrast is enhanced by developing the electrographic image with toner using a development electrode which is biased to a potential which has a value near the average potential of the image but outside of the range of values of potential corresponding to image features selected for enhancement. The voltage potential of the electrographic image is measured to determine the average potential in the region of interest. The development electrode bias is set at a potential near the average potential but outside of the range of potentials corresponding to the image features selected for enhancement in the region of interest of the image. When developed with toner, the toner image has enhanced contrast. If the image is a xeroradiographic image, diagnostic capability of low contrast regions can be enhanced.
REFERENCES:
patent: 4038545 (1977-07-01), Komaki et al.
patent: 4176275 (1979-11-01), Korn et al.
Lubinsky Anthony R.
May John W.
Eastman Kodak Company
Hannaher Constantine
Noval William F.
Wong Don
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