Contrast enhancement of electrographic imaging
First Claim
1. A method for enhancing the contrast of an electrographic image comprising:
- providing an electrostatic image on a support;
measuring the voltage potential of at least a region of interest of said electrostatic image to determine the average voltage potential of at least said region of interest; and
developing the electrostatic image with toner using a development electrode biased at a potential near the average image potential in the region of interest, but outside of the range of values of potential corresponding to image features selected for enhancement in said region of interest, so that said electrostatic image in the region of interest is developed to produce a toner image having enhanced contrast in said region of interest.
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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.
95 Citations
6 Claims
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1. A method for enhancing the contrast of an electrographic image comprising:
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providing an electrostatic image on a support; measuring the voltage potential of at least a region of interest of said electrostatic image to determine the average voltage potential of at least said region of interest; and developing the electrostatic image with toner using a development electrode biased at a potential near the average image potential in the region of interest, but outside of the range of values of potential corresponding to image features selected for enhancement in said region of interest, so that said electrostatic image in the region of interest is developed to produce a toner image having enhanced contrast in said region of interest. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification