In this paper a new method to extend the measurement depth limited by geometric constraints for objects with large depth variances is presented. This method mainly includes the following steps: (1) using the watershed image segmentation algorithm to extract the correct part of the discontinuous absolute phase distribution obtained by geometric constraints, and making a binary mask of the correspondent region; (2) using the window Fourier filter-quality guided phase unwrapping algorithm to obtain the relative phase distribution of the tested object; (3) using the binary mask to get the difference between the relative and the absolute phases; (4) converting the relative phase distribution to absolute phase distribution by referring to their phase difference in the mask region. The experimental results prove the effectiveness and correctness of the proposed method.

中文翻译：

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一种通过几何约束进行3D形状测量的深度扩展方法

本文提出了一种新的方法来扩展具有较大深度变化的对象的几何约束所限制的测量深度。该方法主要包括以下步骤：（1）使用分水岭图像分割算法，提取几何约束得到的不连续绝对相位分布的正确部分，并制作对应区域的二值掩模；（2）利用窗傅立叶滤波质量导引相位解缠算法获得被测物体的相对相位分布；（3）使用二进制掩码获得相对相位和绝对相位之间的差；（4）通过参考它们在掩模区域中的相位差，将相对相位分布转换成绝对相位分布。