一种改进的三角波条纹投影三维测量方法

An Advanced 3D Shape Measurement Method Based on the Triangle Pattern Projection

传统的结构光三维测量方法通常使用二进制条纹离焦投影,但其随着测量距离的加大会使得离焦的程度加深,限制了其在高精度三维测量中的应用。针对深度离焦和非线性gamma的问题,本文提出了三角波条纹轻度离焦结合相移的三维测量方法。该方法具有能够克服非线性gamma造成的测量误差的优点,及三角波条纹能在短距离下轻微离焦成理想的正弦条纹。因此,该方法能有效减小非线性gamma和深度离焦引起的测量误差。均方根误差(RMS)控制在0.03 mm以内。理论分析和实验均证实了该方法的优越性和可行性。

Binary pattern defocused projection is a widely used in traditional structured light 3D shape measurement method. However,the degree of defocusing increase with distance,which makes a limitation for high-accuracy 3D measurement. To slove the pronlem of deep defocusing and nonlinear Gamma effect,a novel method combining triangle pattern slight defocusing combine with phase shifting is proposed. The proposed method can either overcome the measurement error caused by nonlinear gamma or slightly defocusing to an ideal sinusoidal pattern in a short distance. Thus,the method prposed can effectively reduce the measurement error caused by deep defocusing and Gamma effect. The RMS error of the proposed method is < 0. 03 mm. Theory analysis and experiments demonstrate the feasibility and superiority of the proposed method.