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標題: 混成結構光編碼與攝影機校正之研究
Study of Hybrid Structure Light Coding and Camera Calibration
作者: 劉建平
Liu, Jian-Ping
關鍵字: Camera Calibration;攝影機校正;Phase Shihting;Hybrid Structure Light;Gray Code;Gamma correction;相位移;混成結構光;格雷氏編碼;伽馬校正
出版社: 機械工程學系所
引用: 【1】R. Y. Tsai, “A Versatile Camera Calibration Technique for High-Accuracy 3D Machine Vision Metrology using off-the-shelf TV cameras and Lenses,” IEEE. J. of Robotics and Automation, Vol RA-3 NO. 4, pp. 323-344, 1987. 【2】Zhang.Z , “A flexible new technique for camera calibration”, Technical Report MSR-TR-98-71, Microsoft Research, 1999. 【3】G. Sansoni, M. Carocci, and Roberto Rodella, “Three-dimensional vision based on a combination of gray-code and phase-shift light projection: analysis and compensation of the systematic errors”, Applied Optics, Vol.38,No.31, pp.6565-6573, 1999. 【4】G. Sansoni, L. Biancardi, U. Minoni, F. Docchio, “A novel, adaptive system for 3-D optical profilometry using a liquid crystal light projector,” IEEE Transactions on Instrumentation and Measurement, Vol 43, NO. 4, pp.558-566, 1994. 【5】李建緯,「格雷式編碼與相位移在三維曲面量測之應用」,國立中興大學機械工程研究所碩士學位論文,民93年。 【6】F. Chen, G.M. Brown and M. Song, “Overview of three-dimensional shape measurement using optical methods,” Opt. Eng. 39(1), pp.10-22, 2000. 【7】J. Weng, Meber, Paul Cohen, and Marc Herniou, “Camera Calibration with Distorsion Models and Accuracy Evaluation,” IEEE Transcations on Pattern Analysis and Machine Intelligence, Vol 14, NO. 10, pp.965-980, 1992. 【8】蘇鑫元,「結構光形貌量測系統校正與多視角形貌註冊」,國立中興大學機械工程研究所碩士學位論文,民95年。 【9】K. Madsen, H.B. Nielsen, O. Tingleff, METHODS FOR NON-LINEAR LEAST SQUARES PROBLEMS,2004 【10】何宜達,「視覺伺服技術於三維目標軌跡預測與攔截之應用」,國立成功大學航空太空科學研究所碩士學位論文,民91年。 【11】劉定宣,「3D 電腦視覺之攝影機校正」,國立成功大學航空太空科學研究所碩士學位論文,民92年。 【12】黃祿倭,「立體視覺於視訊人體偵測之應用」,國立中興大學電機工程學系碩士學位論文,民97年。

The technology of computer vision is broadly applied in industry such as industrial inspection,3D surface profilometry.Analyzing the images provided by camers ,the world coordinate can be obtained to reconstruct a 3D contours.if the more lower of images distortion the more useful information can be used,and then get more accurate measurement data.At the same time,CCD camera lens distortion or the lack of measurement accuracy of the instrument itself or interference with the external environment,those cases often will make errors on the measurement results,and we start to calibrate them in many ways. The camera calibration is the first step,and then we also have to calibrate brightness of structure light,that we can use hybrid structure light coding to make measurement.
This paper describes Camera Calibration and 、Hybrid Structure Light Coding(Phase Shifting and Gray Code) and γ(Gamma ) correction,By Zheng’s Camera Calibration method,we can calibration camera’s exterior constent and interior constent,we use the liquid crystal display (LCD) which projects the fringe projection,and try to correct LCD projector projecton and image grabbing which result the nonlinearity of the VGA display card, there is always a Gamma correction for LCD or some display equipment to accommodate the human’s visual system,but sometimes the correction will makes brightness nonlinear problem and influences the phase accuracy,so this paper use the Levenberg-Marquardt’s method to solve non-linear least squares problem to find the best γ(Gamma ) valeue.we also analyze difference between before and after of γ(Gamma ) correction that by hybrid structure light coding projection.
其他識別: U0005-1711201109191600
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