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【期刊论文】Uncalibrated Euclidean 3-D Reconstruction Using an Active Vision System
卢荣胜, Y. F. Li, R. S. Lu
IEEE TRANSACTIONS ON ROBOTICS AND AUTOMATION, VOL. 20, NO. 1, FEBRUARY 2004,-0001,():
-1年11月30日
Uncalibrated reconstruction of a scene is desired in many practical applications of computer vision. However, using a single camera with unconstrained motion and unknown parameters, a true Euclidean three-dimensional (3-D) model of the scene cannot be reconstructed. In this paper, we present a method for true Euclidean 3-D reconstruction using an active vision system consisting of a pattern projector and a camera. When the intrinsic and extrinsic parameters of the camera are changed during the reconstruction, they can be self-calibrated and the real 3-D model of the scene can then be reconstructed. The parameters of the projector are precalibrated and are kept constant during the reconstruction process. This allows the configuration of the vision system to be varied during a reconstruction task, which increases its selfadaptability to the environment or scene structure in which it is to work.
Homography, self-calibration, three-dimensional (, 3-D), reconstruction,, uncalibrated reconstruction.,
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【期刊论文】Surface topology from multi-angular reflectivity
卢荣胜, A.K.Forrest, R.S.Lu
Proc. Of SPIE Vol. 6280,-0001,():
-1年11月30日
A surface scanner has been developed which records the light from an approximately flat surface at up to sixteen different angles. The scanner simultaneously records images of the surface as an illuminated spot is traversed across the surface. The optical design of the scanner allows the use of just one parabolic mirror slightly larger than the scan length required, and small detectors for the reflected/scattered light at each angle. Design principles for the scanner are developed and some resulting images on surfaces presented. The data from the above scanner is used to compute the surface topology of a surface by integrating the surface slope measurements obtained from the multi-angle data. This is accomplished by obtaining an estimation of surface slope at each pixel position. Constraints are then imposed on the data to obtain a continuous three-dimensional surface. The surface obtained is compared with data obtained from the surface by measuring with a “Talysurf” stylus measurement machine. To do this a common coordinate frame is needed requiring a rotation and scaling in two directions of one of the data sets to obtain maximum cross-correlation between the three dimensional profiles.
Scanner, surface measurement, profile, reflectance, texture, roughness
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【期刊论文】Surface measurement using active vision and light scattering
卢荣胜, Gui Yun Tian, Rong Sheng Lu, Duke Gledhil
G. Y. Tian et al. Optics and Lasers in Engineering 45 (2007) 131-139,-0001,():
-1年11月30日
This paper reviews the recent progress in surface measurement methods using active vision and light-scattering techniques. The active vision methods with different structured light patterns and the corresponding techniques are summarized. The surface roughness and defects inspection with light-scattering are discussed. After the review, an integrative method to measure surface waviness and form, roughness is proposed.
Surface measurement, Active vision, Light scattering, Speckle pattern
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【期刊论文】On-line Measurement of the Straightness of Seamless Steel Pipes Using Machine Vision Technique
卢荣胜, R.S.Lu, Y.F.Li, Q.Yu
R. S. Lu et al. Sensors and Actuators A 94 (2001) 95-101,-0001,():
-1年11月30日
In this paper, on-line and real-time laser visual alignment measurement technique is studied to measure the spatial straightness of large objects. The basic principle of the visual alignment measurement is detailed. The mathematics models of visual sensor, measurement system and their calibrations are presented. Based on the technique, an experiment system is developed and the straightness of a 1500 mm long seamless steel pipe is inspected. The experiment results show that the measurement technique can achieve total on-line measurement and it offers high precision and stability, which is of practical importance for the application.
Visual alignment, Straightness, On-line measurement, Calibration
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【期刊论文】On-line measurement of surface roughness by laser light scattering
卢荣胜, Rong-Sheng Lu , Gui Yun Tian
Institute of Physics Publishing Measurement Science and Technology Meas. Sci. Technol. 17 (2006) 1496-1502,-0001,():
-1年11月30日
On-line roughness measurement of a surface with one-dimensional manufacturing marks is difficult to implement. For example, a contact stylus-type inspection method often does not perform very well or fails without any prior knowledge of the mark distribution on the surface. In this paper, we propose an on-line surface roughness measurement method based on laser light scattering, which is very effective for roughness measurement of one-dimensional manufacturing surfaces. The surface roughness is obtained from the spatial distribution of the scattered light intensity. The measurement setup has a very simple configuration, which consists of a CCD sensor, a collimated diode laser and an expander. The orientation of the spatial distribution of the scattered light intensity from the surface, which depends on the surface orientation, is detected by the CCD sensor, and then the mark direction can be readily determined from image processing. After that the root-mean-square (RMS) height of the surface roughness is extracted by means of image processing of the scattered light distribution in the direction parallel to the manufacturing mark, rather than in the direction perpendicular to the mark which is often followed by other measurement probes. The experimental tests show that the non-contact method has great potential for on-line surface roughness measurement.
on-line measurement,, surface roughness,, light scattering,, one-dimensional manufacturing surface
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