半调图像分类在逆半调过程中是非常关键的步骤。
The classification of halftone image is a key step in the process of inverse halftone.
为使图像处理结果具有较好的边缘特征，可将边缘区域和非边缘区域在逆半调的过程中分别进行处理。
Traditional lowpass filter would make the image edges blurred. So we have to process the edge area and the un-edge area independently.
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