Patent ID: 8514284

Claim:
A system for imaging a textured surface comprising: a photoreceptor array including: at least a first photoreceptor and a second photoreceptor, each configured to receive electromagnetic radiation reflected from the textured surface and to generate a signal corresponding thereto; wherein the photoreceptor array is configured to detect an image of the textured surface based on a difference between time of arrival of the generated signals from the first and second photoreceptors, wherein the first photoreceptor and the second photoreceptor are each initially configured to operate in a high gain mode, and wherein first radiation reflected from a first portion of the textured surface that impinges on the first photoreceptor causes the first photoreceptor to generate current through the first photoreceptor and the current causes the second photoreceptor to become temporarily unbiased so as to not operate in the high gain mode, such that, when second radiation reflected from a second portion of the textured surface impinges on the second photoreceptor in a lower gain mode it will be substantially undetected by the second photoreceptor.