High contrast, low distortion optical acquistion system for image capturing
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United States of America Patent
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Apr 30, 2002
Grant Date -
N/A
app pub date -
Nov 12, 1998
filing date -
Nov 12, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An apparatus and method for acquiring an image of a patterned object such as a fingerprint including a light refracting device, a focusing lens, and a light source. The light refracting device can, for example, be a prism and includes an imaging surface, a light receiving surface and a viewing surface. Incident light from the light source is projected through the light receiving surface and reflected off a surface other than the imaging surface. This reflected light is then projected onto the imaging surface to create an image of the patterned object from substantially all scattered light through the viewing surface. The lens is placed adjacent to the viewing surface to focus the light on an image sensor.
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