重建CT图像的前后方向的几何误差是随着扫描层厚增加而增加，主要是由于CT扫描的部分容积效应影响。

The geometric error of axial image reconstruction increases with the increase of CT scan slice thickness, due to CT partial volume effect.

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数码相机摄入图像时产生的线性几何畸变会给叶片面积的测量带来误差。

The leaf image taken by digital camera often has linear geometric distortion, it can bring error to the measurement of leaf area.

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采用像素点变换法，实现了根据三维物体的二维投影图像恢复物体表面的真实几何面积的设想，大大降低了缺陷面积计算的误差；

To decrease the relative errors, the pixel transform method was adopted to recover the geometrical feature of sphere fruit surface from projected image while the area of defect was calculated.

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