According to the characteristics of nuclear medical image, a contrast stretching algorithm of smoothed image is provided.

根据核医学图像的特点，给出了核医学图像的平滑对比度拉伸处理算法。

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The contour component is extracted by calculating a difference between the input image and a smoothed image that is the input image subjected to smoothing by a smoothing image generating unit (24).

通过计算由平滑图像生成部(24)对输入图像进行平滑化后的平滑图像与输入图像的差分，提取轮廓成分。

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In the improved algorithm, the pre-processed image is smoothed and the proper gradient threshold is set to prevent the generation of insignificant regions.

该改进算法在预处理阶段对图像进行平滑操作并设置适当的梯度阈值，即减少了梯度图像中非重要区域的产生。

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