这些练习在画出或没有画出对象轮廓的情况下都能进行。

This can all be done with or without outlining the subject.

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最后，采用启发式搜索方法连接视频对象轮廓边缘点，进而提取出视频对象。

Finally, we applied heuristic search method to link video object contour's edge points, sequentially extracted video object.

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剪影是由外部轮廓与单调内景组成的人物、物体或场景图像，剪影的对象通常都为黑色。

A silhouette is the image of a person, an object or scene consisting of the outline as well as a featureless interior, with the silhouetted object usually being black.

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