通过对距离图像连通区域极大值进行统计分析，提取该连通区域的颗粒形态特征。

Granule shape features of connected region were extracted through statistically analyzing maximum points of connected region in distance image.

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由于心脏的变形和血液的流动，MRI图像中出现了弱边界、局部梯度极大值区域、伪影等现象。

Due to cardiac deformation and blood flowing, weak edges, local gradient maximum regions and artifacts are found in the MRI images.

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