Iowa State University Research Foundation, Inc.

Gi, LLC

International Press of Boston, Inc.

Song Zhang

Shing-Tung Yau

Dale Owen Royer

Yalin Wang

Yajun Wang

William F Lohry

Xiangfeng Gu

A method for three-dimensional (3D) shape measurement includes generating fringe patterns using a dithering technique, projecting the fringe patterns onto an object using a projector, capturing the fringe patterns distorted by surface geometry of the object using an imaging device, and performing a fringe analysis to reconstruct a 3D shape of the object using the fringe patterns and the fringe patterns distorted by the surface geometry of the object. The step of generating the fringe patterns using the dithering technique may include binarizing sinuisoidal fringe patterns with the dithering technique. The step of generating the fringe patterns using the dithering technique may include applying an optimization algorithm.

3D shape measurement using dithering

A system for simultaneous real-time three-dimensional geometry and color texture acquisition. The system includes a system processor for generating at least three phase shifted black and white fringe patterns with a phase shift of 2 &#x3c0;/3, a light projector adapted to project the fringe patterns onto an object, the projector being electrically connected with the system processor, and a color camera for capturing the fringe patterns to generate at least three raw fringe images. The fringe images are used to calculate a black and white texture image which is further converted to a color image by employing a demosaicing algorithm. The fringe images are also used to calculate a wrapped phase map that is further processed to generate a continuous unwrapped phase map by employing a phase unwrapping algorithm and the unwrapped phase map is converted to co-ordinates using calibrated system parameters for point-by-point three-dimensional shape measurement.

Simultaneous three-dimensional geometry and color texture acquisition using single color camera

A method and associated apparatus for capturing an image of a 3D object () which encodes the surface geometry of at least a portion of the object, comprising: 1. projecting () a plurality of fringe patterns (A,A) onto the object; 2. capturing () phase alterations in reflections of the fringe patterns (B,B) from the object; 3. projecting a uniform image (A) onto the object; 4. capturing a reflection of the uniform image (B) from the object; and 5. combining () captured phase alterations and captured uniform image reflection on a pixel-by-pixel basis, thereby forming a holoimage representation of the object.

Method and apparatus for absolute-coordinate three-dimensional surface imaging

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Ames, IA, United States of America

Song Zhang