It solves the difficulty in binarization due to gray level confusion between local background and image by automatic thresholding with local image enhancement.
通过局部图像增强的自动阈值选择等手段，解决视网膜血管图像与局部背景之间因灰度混同所造成的二值化困难；
The enhancement of image has linear and non-linear enhancement, and includes global enhancement and local enhancement.
图像增强分为线性增强和非线性增强，其方法有两种：全局的和局部的。
Adaptive segmentation and local enhancement methods are used to process images taken in haze. As the result, higher contrast of image is obtained without noise magnification in sky region.
采用图像自适分割方法以及图像局部增强方法对轻雾天气下的图像进行处理，在大幅度提高图像清晰度的同时避免了天空噪声的放大。
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