Shape-Reconstruction System for Three-Dimensional Objects Using an Ultrasonic Distance Sensor Mounted on a Manipulator

1989 ◽  
Vol 111 (2) ◽  
pp. 180-186 ◽  
Author(s):  
Takeshi Tsujimura ◽  
Tetsuro Yabuta ◽  
Takenori Morimitsu
Keyword(s):  
Three Dimensional ◽  
Shape Reconstruction ◽  
Measured Data ◽  
Three Dimensional Objects ◽  
Dimensional Shape ◽  
Distance Sensor ◽  
Position And Orientation ◽  
Dimensional Object ◽  
Three Dimensional Shape ◽  
Manipulator Control

This paper presents a three-dimensional shape-reconstruction system that employs an ultrasonic distance sensor placed on a manipulator. This system can not only reconstruct the shape of an object, but it can also precisely assess the distance from the manipulator to the object. By employing the freedom of the manipulator, the system can measure an object with the sensor in any position and orientation, and can then numerically reconstruct object images using measured data. Experimental results show that the newly developed system and method make object shape reconstruction easy and inexpensive. They also show that the three-dimensional object data obtained by this method can be used in manipulator control.

scholarly journals The Effect of Material Properties on the Perceived Shape of Three-Dimensional Objects

i-Perception ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 204166952098231
Author(s):  
Masakazu Ohara ◽  
Juno Kim ◽  
Kowa Koida
Keyword(s):  
Material Properties ◽  
Regional Variation ◽  
Three Dimensional ◽  
Mean Square ◽  
Viewing Condition ◽  
Three Dimensional Objects ◽  
Transparent Objects ◽  
Dimensional Shape ◽  
Local Root ◽  
Three Dimensional Shape

Perceiving the shape of three-dimensional objects is essential for interacting with them in daily life. If objects are constructed from different materials, can the human visual system accurately estimate their three-dimensional shape? We varied the thickness, motion, opacity, and specularity of globally convex objects rendered in a photorealistic environment. These objects were presented under either dynamic or static viewing condition. Observers rated the overall convexity of these objects along the depth axis. Our results show that observers perceived solid transparent objects as flatter than the same objects rendered with opaque reflectance properties. Regional variation in local root-mean-square image contrast was shown to provide information that is predictive of perceived surface convexity.

Material Surface Reconstruction Based on Light Projection

2010 ◽  
Vol 143-144 ◽  
pp. 768-772
Author(s):  
Shao Yan Gai ◽  
Fei Peng Da
Keyword(s):  
Surface Reconstruction ◽  
Three Dimensional ◽  
Shape Reconstruction ◽  
Material Surface ◽  
Reconstruction Method ◽  
Object Surface ◽  
Reconstruction Process ◽  
Dimensional Shape ◽  
Three Dimensional Shape ◽  
Vision Geometry

A surface reconstruction method for material shape analysis is presented. The three-dimensional shape reconstruction system detects object surface based on optical principle. A series of gratings are projected to the object, and the projected gratings are deformed by the object surface. From images of the deformed gratings, three-dimensional profile of the material surface can be obtained. The basic aspects of the method are discussed, including the vision geometry, the light projection and code principle. The proposed method can deal with objects with various discontinuities on the material surface, thus increasing the flexibility and robustness of shape reconstruction process. The experimental results show the efficiency of the method, the material surface can be reconstructed with high precision in various applications.

Porcelain three-dimensional shape reconstruction and its color reconstruction

2013 ◽  
Author(s):  
Xiaoyang Yu ◽  
Haibin Wu ◽  
Xue Yang ◽  
Shuang Yu ◽  
Beiyi Wang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Shape Reconstruction ◽  
Dimensional Shape ◽  
Three Dimensional Shape
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