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《Opto-electronic Engineering》 2005-02
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Profile extraction of structural light image and its correction based on light intensity

LI Ming, FENG Hua-jun, XU Zhi-hai, LI Qi (State key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China)  
During 3-D detection of objects with same reflectance by laser triangulation, profile extraction error may appear because of loss of stripes. Due to this error, correct results cannot be obtained by use of common-used profile extraction methods such as center line method or weighting method. So a new method correcting with light intensity information is proposed. The profile with errors are extracted by center line method and then corrected by use of light intensity distribution. The normal direction on the object surface can be verified by successive approximation based on the relationship between light intensity and normal direction on object surface. The updating values can be obtained through theoretical derivation, calculation and comparison with the already obtained profile. Experimental measurement and correction for laser stripe loss appeared on the surface of the measured object with practical height of 40.1mm are carried out. Compared with traditional methods, its measuring result became from 38.4mm to 39.4mm, which approaches the true value, and its error has been reduced from 4.23% to 1.75%.
【CateGory Index】: TP391.4
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