考虑到实际处理时的实时要求，应用改进后的罗泊特梯度算子来提取漏节的轮廓，使处理时间大大缩短。
The improved Robert was used in the paper to outline the knot-hole so that the processing was almost on real time.
模型对初始轮廓的位置和形状没有特别的要求，将该模型应用于心脏MRI图像的分割中，取得了较好的分割效果。
The proposed model has no special requirement to the location and shape of the initial contour. The encouraging effectiveness of the model is demonstrated with the experiments on the cardiac MRI.
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