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53results about How to "Few image" patented technology

Full-field three-dimensional measurement method

A method and system for full-field fringe-projection for 3-D surface-geometry measurement, referred to as “triangular-pattern phase-shifting” is disclosed. A triangular grey-scale-level-coded fringe pattern is computer generated, projected along a first direction onto an object or scene surface and distorted according to the surface geometry. The 3-D coordinates of points on the surface are calculated by triangulation from distorted triangular fringe-pattern images acquired by a CCD camera along a second direction and a triangular-shape intensity-ratio distribution is obtained from calculation of the captured distorted triangular fringe-pattern images. Removal of the triangular shape of the intensity ratio over each pattern pitch generates a wrapped intensity-ratio distribution obtained by removing the discontinuity of the wrapped image with a modified unwrapping method. Intensity ratio-to-height conversion is used to reconstruct the 3-D surface coordinates of the object. Intensity-ratio error compensation involves estimating intensity-ratio error in a simulation of the measurement process with both real and ideal captured triangular-pattern images obtained from real and ideal gamma non-linearity functions. A look-up table relating the measure intensity-ratio to the corresponding intensity-ratio error is constructed and used for intensity-ratio error compensation. The inventive system is based on two-step phase-shifting but can be extended for multiple-step phase-shifting.
Owner:UNIVERSITY OF WATERLOO

Full-field three-dimensional measurement method

A method and system for full-field fringe-projection for 3-D surface-geometry measurement, referred to as “triangular-pattern phase-shifting” is disclosed. A triangular grey-scale-level-coded fringe pattern is computer generated, projected along a first direction onto an object or scene surface and distorted according to the surface geometry. The 3-D coordinates of points on the surface are calculated by triangulation from distorted triangular fringe-pattern images acquired by a CCD camera along a second direction and a triangular-shape intensity-ratio distribution is obtained from calculation of the captured distorted triangular fringe-pattern images. Removal of the triangular shape of the intensity ratio over each pattern pitch generates a wrapped intensity-ratio distribution obtained by removing the discontinuity of the wrapped image with a modified unwrapping method. Intensity ratio-to-height conversion is used to reconstruct the 3-D surface coordinates of the object. Intensity-ratio error compensation involves estimating intensity-ratio error in a simulation of the measurement process with both real and ideal captured triangular-pattern images obtained from real and ideal gamma non-linearity functions. A look-up table relating the measure intensity-ratio to the corresponding intensity-ratio error is constructed and used for intensity-ratio error compensation. The inventive system is based on two-step phase-shifting but can be extended for multiple-step phase-shifting.
Owner:UNIVERSITY OF WATERLOO

Coherent Memory Access in Monte Carlo Volume Rendering

A method for Monte Carlo volume rendering in accordance with the present teachings includes: (a) tracing a plurality of light rays into a scene containing volumetric data, the light rays configured for simulating global illumination; (b) randomizing the scattering location and direction of the plurality of light rays through the volume, wherein a common sequence of random numbers is used in order for the scattering direction of each of the plurality of randomized scattered light rays to be substantially parallel; (c) computing at least one trilinearly interpolated and shaded sample along each of the plurality of randomized scattered light rays based on stored volumetric data, wherein at least a portion of the stored volumetric data used in at least a portion of the computing is configured for coherent access; and (d) rendering the volume with global illumination based on a plurality of iterations of the tracing, the randomizing, and the computing. Systems for Monte Carlo volume rendering are described.
Owner:SIEMENS HEALTHCARE GMBH

System and method for sweeping mirror enhanced imaging flow cytometry

An imaging flow cytometry system and method which includes a flow chamber, tracking mirror, microscope and imaging optics, image capturing system, device to regulate fluid flow through the chamber, and backlighting generator. The tracking mirror moves at a rate matched to the particle velocity in the flow chamber so as to enhance the sample flow rates possible with the system while maintaining clear and accurate imaging. The backlighting generator passes through the flow chamber and the objective before being focused on the image capturing system. Detected scatter events initiate tracking by the mirror, resulting in imaging with reduced motion blur even at high rates of flow.
Owner:FLUID IMAGING TECH

Computer tomography (CT) c-arm system and method for examination of an object

A Computer Tomography (CT) C-arm system and method for examination of an object is provided. The Computer Tomography (CT) C-arm system for examination of an object of interest, the CT-C-arm system comprises an X-ray tube adapted for generating X-rays, an X-ray detection unit to acquire a set of CT slices, wherein the X-ray tube, and the X-ray detection unit are adapted to be rotatable on a C-arm around a common axis around the object under examination and a processing unit by which the following steps are executable: acquiring a first 3D data volume of the CT slices using first scan parameters; adjusting the first data volume to a second data volume (segmented volume) such that voxel values of the first data volume of at least one predefined range of Hounsfield (H) are set to an at least one predefined H-value; generating a forward projection of the second data volume using the first scan parameters; reconstructing the projection to a third data volume; generating a fourth data volume (artefact-only volume) by subtracting the third volume with the second volume; generating a fifth volume by adding the first volume with the fourth volume.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV

Belt for electrophotography

An endless belt for electrophotography is disclosed which is obtainable continuously by melt extrusion from a circular die. The endless belt has a layer containing a thermoplastic resin having a diphenyl sulfone structure represented by the following Formula (1) Also disclosed are a process for producing the endless belt and an image forming apparatus having the endless belt.
Owner:CANON KK
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