The main features of the system are piecewise linear gray level transformation, slope angle adjustment, mapping and normalization, feature distilling.

本系统主要特征是分段线性灰度变换、斜度调整、射归一、征提取。

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The attenuation of X-ray through the object is non-linear and the gray level of image is non-linear response of object thickness.

射线穿过物体的衰减是非线性的，经过影像系统得到的图像灰度与物体厚度是非线性的关系；

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This paper presents an algorithm of acquiring depth map using linear approximation based on gray level information. Using the algorithm, surface reconstruction can be easily realized.

该文提出了一种用线性逼近方法、基于灰度信息从图像获取物体深度信息，从而实现物体三维表面重建的算法。

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