Correction of Photometric Distortion of a Micro Camera-Projector System for Structured Light 3D Scanning

Abstract

This paper addresses photometric distortion problems of a compact 3D scanning sensor which is composed of a micro-size and inexpensive camera-projector system. Recently, many micro-size cameras and projectors are available. However, erroneous 3D scanning results may arise due to the poor and nonlinear photometric properties of the sensors. This paper solves two inherent photometric distortions of the sensors. First, the response functions of both the camera and projector are derived from the least squares solutions of passive and active calibration, respectively. Second, vignetting correction of the vision camera is done by using a conventional method, however the projector vignetting is corrected by using the planar homography between the image planes of the projector and camera, respectively. Experimental results show that the proposed technique enhances the linear properties of the phase patterns that are generated by the sensor.

Enhancement of 3D Scanning Performance by Correcting the Photometric Distortion of a Micro Projector-Camera System

“…[8]. 또한 카메라와 프로젝터의 응 답 함수(response function)를 보정하기위하여 참고문헌 [7]에 서 제안한 방법을 이용하여 카메라와 프로젝터의 감마 곡 선(gamma curve)을 계산하고 이를 선형화하였다. 그림16.…”