Volume 6 Issue 4
Aug.  2013
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WU Hai-bin, TANG Sha-you, CHENG Hao, WANG Hui, YU Xiao-yang. Calibration of color coupling and color unbalance in coded structured light system[J]. Chinese Optics, 2013, 6(4): 521-528. doi: 10.3788/CO.20130604.0521
Citation: WU Hai-bin, TANG Sha-you, CHENG Hao, WANG Hui, YU Xiao-yang. Calibration of color coupling and color unbalance in coded structured light system[J]. Chinese Optics, 2013, 6(4): 521-528. doi: 10.3788/CO.20130604.0521

Calibration of color coupling and color unbalance in coded structured light system

doi: 10.3788/CO.20130604.0521
  • Received Date: 14 Apr 2013
  • Rev Recd Date: 17 Jun 2013
  • Publish Date: 10 Aug 2013
  • To reduce the interference of color coupling and color unbalance and to increase the reconstruction accuracy of shape and color in a coded structured light system, a color coded structured light system was established and two color-related sections(coding principle and color reconstruction) and their color calibration methods were investigated. First, based on the coding principle by color trapezoidal phase-shifting intensity ratio, the mutual coupling phenomenon between RGB primary colors in coding process was analyzed, and color coupling calibration scheme by Caspi model and hardware calibration was designed. Then, based on point-by-point color reconstruction method, the unbalance phenomenon caused by surface curvature in color reconstruction process was analyzed, and color unbalance calibration scheme using surface geometry information was designed. Calibration experimental results indicate that the red component in pure green after calibration is about 1/10 of that before calibration; and calibrated chromatic aberration of unicolor surface is about 0.1, which approaches to the visual resolving power and is significantly less than that before calibration(0.4). Moreover, the reconstructed unicolor complex surface has uniform color and good visual effect and is accorded with measured surface. It can satisfy the system requirements of strong anti-interference, and is conduced to the reconstruction accuracy of shape and color.

     

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