我变暗了黑色透明的遮罩来帮助把文字从背景分离，这使得两者没有冲突。

I darkened the black transparent box to help separate the text from the background, so that the two didn't compete.

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最后利用二值形态运算进一步处理，便可得到封闭的骨肿瘤边界，从而将骨肿瘤与背景分离。

Further processing of resulting boundary with binary morphological operation produces a closed osteomas contour. So osteomas is isolated from background.

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借鉴面向对象的思想，提出了一种扫描地形图自动分层算法，算法先将地形图线划要素与普染区背景分离；

In this paper, object-oriented approach is introduced into of segmentation scanned map. The procedure is described as follows. First, linear elements and area elements are separated.

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