Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2005-12-06
2005-12-06
Le, Thien M. (Department: 2876)
Registers
Coded record sensors
Particular sensor structure
C462S080000, C462S080000
Reexamination Certificate
active
06971576
ABSTRACT:
A planar laser illumination and imaging (PLIIM) based camera system capable of producing digital images with reduced levels of speckle-pattern noise. The PLIIM based camera system comprises a planar laser illumination array (PLIA) including a plurality of laser diodes for producing and projecting a planar laser illumination beam (PLIB) so as to illuminate an object as it is moving past said PLIIM based camera system. An image formation and detection (IFD) module is provided having a image detection array and imaging forming optics for providing the image detection array with a field of view (FOV). The PLIB and FOV are arranged in a coplanar relationship along the working range of the PLIIM based camera system so that the PLIB illuminates primarily within the FOV of the IFD module. A speckle-pattern noise reduction subsystem is integrated with the IFD, for reducing the spatial-coherence of said planar laser illumination beam (PLIB) after the PLIB has illuminated and reflected/scattered off the target object. The speckle-pattern noise reduction subsystem carries out a spatial intensity modulation technique after the reflection/scattering of the PLIB off the target, so that the laser illumination reflected/scattered off the object consists of spatially coherent-reduced planar laser illumination, causing numerous substantially different time-varying speckle-noise patterns to be produced at the image detection array over the photo-integration time period thereof. The numerous substantially different time-varying speckle-noise patterns are detected at the image detection array over the photo-integration time period, and the detected speckle-noise patterns are temporally averaged at said image detection array during the photo-integration time period thereof. As a result of such temporal averaging, the RMS power of observable speckle-noise patterns is reduced at the image detection array. By virtue of the present invention, it is now possible to enjoy the benefits of laser-based illumination during high-speed imaging operations, without the adverse effects of speckle-pattern noise.
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Good Timothy A.
Jankevics Andrew
Knowles C. Harry
Tsikos Constantine J.
Wirth Allan
Le Thien M.
Metrologic Instruments Inc.
Perkowski Esq. P.C. Thomas J.
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