Thresholding converts a greyscale image into a binary image, and is thus often a necessary segmentation step in image processing. For a human viewer however, thresholding usually has a negative impact on the legibility of document images. This report describes a simple method for "smearing out" the threshold and transforming the greyscale image into a different greyscale image. The method is similar to fuzzy thresholding, but is discussed here in the simpler context of greyscale transformations and, unlike fuzzy thresholding, it is independent from the method for finding the threshold. A simple formula is presented for automatically determining the width of the threshold spread. The method can be used, e.g., for enhancing images for the presentation in online facsimile repositories.
翻译：悬浮屏蔽将灰度图像转换成二进制图像,因此往往是图像处理过程中一个必要的分离步骤。 但是,对于人类观众来说,阈值通常会对文档图像的清晰度产生消极影响。 本报告描述了一种简单的方法,用于“擦除”阈值,并将灰度图像转换成不同的灰度图像。这种方法类似于模糊的阈值,但在此讨论的是灰度变换的简单背景,与模糊的阈值不同,它独立于查找阈值的方法。为自动确定阈值扩展的宽度,提出了一个简单的公式。可以使用这种方法,例如,用于加强图像在在线传真储存库中演示。
相关内容
微信扫码咨询专知VIP会员