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Automatic 3D Model Acquisition for Unknown Objects Based on Hybrid Vision Technology
Wei Fang,Lianyu Zheng,BINGWEI HE,Qing Wang 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.3
Three-dimensional (3D) model acquisition is the process of building a 3D model of an object. But due to the limited field of view of the scanner, this task is mainly performed by taking several scans with human intervention. In order to make the 3D modeling process efficient, a novel automatic 3D modeling method for unknown objects based on hybrid vision technology in a binocular structured light system (BSLS) is proposed. Firstly, the limit visual vacuums of the BSLS are established, and they will be used to predict the unknown area with an acquired 2.5D range image. With the 2D intensity image acquired synchronously, the coarse boundary size is recovered from Shape from Shading, and it leads the prediction of the unknown area to be more precise. Based on the combination of the predicted contours, the next best viewpoint is determined with more unknown areas visible. The proposed method can be used to obtain t
Distortion Correction Modeling Method for Zoom Lens Cameras with Bundle Adjustment
Wei Fang,Lianyu Zheng 한국광학회 2016 Current Optics and Photonics Vol.20 No.1
For visual measurement under dynamic scenarios, a zoom lens camera is more flexible than a fixedone. However, the challenges of distortion prediction within the whole focal range limit the widespreadapplication of zoom lens cameras greatly. Thus, a novel sequential distortion correction method for a zoomlens camera is proposed in this study. In this paper, a distortion assessment method without coupling effectis depicted by an elaborated chessboard pattern. Then, the appropriate distortion correction model for azoom lens camera is derived from the comparisons of some existing models and methods. To gain arectified image at any zoom settings, a global distortion correction modeling method is developed withbundle adjustment. Based on some selected zoom settings, the optimized quadratic functions of distortionparameters are obtained from the global perspective. Using the proposed method, we can rectify all imagesfrom the calibrated zoom lens camera. Experimental results of different zoom lens cameras validate thefeasibility and effectiveness of the proposed method.