Planar laser illumination and imaging (PLIIM) based camera system for producing high-resolution 3-D images of moving 3-D objects
First Claim
1. A planar laser illumination and imaging (PLIIM) based camera system for producing high-resolution 3-D images of 3-D object surfaces of arbitrary surface geometry moving relative to said PLIIM based camera system, said PLIIM-based camera system comprising:
- a system housing having first, second, third and fourth light transmission apertures linearly aligned with and optically isolated from each other, and said third light transmission aperture being disposed between said first and second light transmission apertures;
a LADAR-based object profiling subsystem, disposed within said system housing, for projecting an amplitude modulated (AM) laser beam through said fourth light transmission aperture, and scanning said laser beam across a 3-D object surface of arbitrary surface geometry moving past said fourth light transmission aperture, so as to measure the surface profile of said moving 3-D object surface and produce a series of linear 3-D surface profile maps thereof as said 3-D object surface moves past said PLIMM-based camera system, wherein each said linear 3-D surface profile map comprises a set of 3-D coordinates specifying the location of sampled points along said moving 3-D object surface;
a linear imaging subsystem, disposed within said system housing, for producing a series of linear high-resolution 2-D images of said moving 3-D object surface as said 3-D object surface moves past said system, wherein each said linear high-resolution 2-D image comprises a set of pixel intensity values, and each said pixel intensity value being assigned a set of two-dimensional coordinates specifying the location of the pixel in said linear high-resolution 2-D image, and wherein said linear imaging subsystem includes a linear image formation and detection module having image formation optics with a field of view projectable through said third light transmission aperture and onto said 3-D object surface moving relative to said first, second and third light transmission apertures during object illumination and imaging operations, and a pair of planar laser illumination arrays (PLIAs) disposed in said system housing, each said planar laser array (PLIA) including a plurality of laser diodes arranged together in a linear manner and said PLIAs being arranged in relation to said linear image formation and detection module, for producing a pair of stationary planar laser illumination beams (PLIBs), and projecting said pair of stationary PLIBs through said first and second light transmission apertures and oriented such that the plane of said PLIBs is coplanar with the field of view of said linear image formation and detection module so that the object can be simultaneously illuminated by said PLIBS and imaged within said field of view of said linear image formation and detection module; and
an image processing computer, for constructing high-resolution 3-D images of said 3-D object surface using said linear 3-D surface profile maps and said high-resolution 2-D linear images of said moving object surface.
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Abstract
A planar laser illumination and imaging (PLIIM) based camera system for producing high-resolution 3-D images of moving 3-D objects having arbitrary surface geometry. The PLIIM-based camera system comprises a system housing of unitary construction, a LADAR-based object profiling subsystem, a PLIIM-based linear imaging subsystem, and an image processing subsystem disposed therein. The system housing has first, second, third and fourth light transmission apertures linearly aligned with and optically isolated from each other, and the third light transmission aperture is disposed between the first and second light transmission aperture. The LADAR-based object profiling subsystem projects an amplitude modulated (AM) laser beam through the fourth light transmission aperture, and scans the laser beam across an 3-D object surface of arbitrary surface geometry moving past the fourth light transmission aperture. The return AM laser beam is processed in order to measure the surface profile of the moving 3-D object surface and produce a series of linear 3-D surface profile maps thereof. Each linear 3-D surface profile map comprises a set of 3-D coordinates specifying the location of sampled points along the moving 3-D object surface. The PLIIM-based linear imaging subsystem produces a series of linear high-resolution 2-D images of the moving 3-D object surface. Each linear high-resolution 3-D image comprises a set of pixel intensity values, and each pixel intensity value is assigned a set of two-dimensional coordinates specifying the location of the pixel in the linear high-resolution 2-D image. The image processing subsystem automatically processes the linear 3-D surface profile maps and the high-resolution 2-D linear images captured by the subsystems in order to construct high-resolution 3-D images of the 3-D object surface. By virtue of the present invention, it is now possible to produce high-resolution 3-D images of moving 3-D object surfaces using linear imaging and 3-D profiling techniques.
54 Citations
8 Claims
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1. A planar laser illumination and imaging (PLIIM) based camera system for producing high-resolution 3-D images of 3-D object surfaces of arbitrary surface geometry moving relative to said PLIIM based camera system, said PLIIM-based camera system comprising:
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a system housing having first, second, third and fourth light transmission apertures linearly aligned with and optically isolated from each other, and said third light transmission aperture being disposed between said first and second light transmission apertures;
a LADAR-based object profiling subsystem, disposed within said system housing, for projecting an amplitude modulated (AM) laser beam through said fourth light transmission aperture, and scanning said laser beam across a 3-D object surface of arbitrary surface geometry moving past said fourth light transmission aperture, so as to measure the surface profile of said moving 3-D object surface and produce a series of linear 3-D surface profile maps thereof as said 3-D object surface moves past said PLIMM-based camera system, wherein each said linear 3-D surface profile map comprises a set of 3-D coordinates specifying the location of sampled points along said moving 3-D object surface;
a linear imaging subsystem, disposed within said system housing, for producing a series of linear high-resolution 2-D images of said moving 3-D object surface as said 3-D object surface moves past said system, wherein each said linear high-resolution 2-D image comprises a set of pixel intensity values, and each said pixel intensity value being assigned a set of two-dimensional coordinates specifying the location of the pixel in said linear high-resolution 2-D image, and wherein said linear imaging subsystem includes a linear image formation and detection module having image formation optics with a field of view projectable through said third light transmission aperture and onto said 3-D object surface moving relative to said first, second and third light transmission apertures during object illumination and imaging operations, and a pair of planar laser illumination arrays (PLIAs) disposed in said system housing, each said planar laser array (PLIA) including a plurality of laser diodes arranged together in a linear manner and said PLIAs being arranged in relation to said linear image formation and detection module, for producing a pair of stationary planar laser illumination beams (PLIBs), and projecting said pair of stationary PLIBs through said first and second light transmission apertures and oriented such that the plane of said PLIBs is coplanar with the field of view of said linear image formation and detection module so that the object can be simultaneously illuminated by said PLIBS and imaged within said field of view of said linear image formation and detection module; and
an image processing computer, for constructing high-resolution 3-D images of said 3-D object surface using said linear 3-D surface profile maps and said high-resolution 2-D linear images of said moving object surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification