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Inicio  /  Applied Sciences  /  Vol: 8 Núm: 4 Par: April (2018)  /  Artículo
ARTÍCULO
TITULO

Camera Calibration with Phase-Shifting Wedge Grating Array

Jiayuan Tao    
Yuwei Wang    
Bolin Cai and Keyi Wang    

Resumen

Planar targets with known features have been widely used for camera calibration in various vision systems. This paper utilizes phase-shifting wedge grating (PWG) arrays as an active calibration target. Features points are encoded into the carrier phase, which can be accurately calculated using the phase-shifting algorithm. The 2π-phase points are roughly extracted with edge detection and then optimized by windowed bicubic fitting with sub-pixel accuracy. Two 2π-phase lines for each PWG are obtained using linear fitting method. The PWG centers that are used as feature points are detected through computing the intersections of 2π-phase lines. Experiment results indicate that the proposed method is accurate and reliable.

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