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灰度图像插值是体绘制的预处理步骤。插值结果的好坏， 直接影响着绘制的效果。通常， 插值错误主要出现在组织的边界处。组织的表面上灰度的变化较小， 如果在表面上做插值， 就可以保证插值在相同组织之间进行，避免了常用的线性插值会产生新组织的错误；而在组织内部，由于灰度值变化不大，只要做简单的线性插值就可以了。基于上述考虑，本文以局部平面来近似组织的表面， 将局部表面方向和梯度信息用于三维灰度图像的内插重建， 充分利用了三维数据的相关信息， 取得了较好的效果。实际的数据实验结果证明， 在保持表面的光滑、连续和清晰的同时，显著减少了内插错误。
Grayscale image interpolation is the preprocessing step of volume rendering. Interpolation results are good or bad, directly affect the drawing effect. In general, interpolation errors occur mainly at the boundaries of the organization. The surface of the tissue changes little gray, if the surface interpolation, you can ensure that the interpolation between the same organization to avoid the commonly used linear interpolation will produce new tissue errors; and within the organization, due to the gray Small changes in value, as long as simple linear interpolation on it. Based on the above considerations, this paper uses the local plane to approximate the surface of the tissue, and uses the local surface orientation and gradient information for the interpolation reconstruction of the three-dimensional gray image. It makes full use of the related information of the three-dimensional data and achieves good results. Practical data The experimental results show that interpolation errors are significantly reduced while keeping the surface smooth, continuous and clear.