其中图像预处理包括直方图均衡化、中值滤波、局部增强、同态滤波增强等工序；
The first stage is include image's gray numbers on average, image enhancing by average filter, part enhancing and enhancing by homeostasis filter.
此文主要研究用于增强图像的灰度变换方法，包括线性灰度变换、非线性灰度变换与直方图均衡化方法。
This paper mainly tells us the ways of image gray transformation, including linear gray transformation, nonlinear gray transformation and the approach of histogram equalization.
光谱增强包括线性反差拉伸、非线性反差拉伸、直方图均衡化和直方图匹配等方法。
Spectral enhancement includes linear contrast stretch, non-linear contrast stretch, histogram equalization and histogram matching etc.
眼底图像的预处理系统包括：彩色图像的处理、图像的几何变换以及图像的直方图均衡、图像的平滑化及锐化处理等增强功能。
Fundus image preprocessing system consists of Color image processing, image geometric transformation and the image histogram equalization, the image smooth and sharpen enhancement function.
眼底图像的预处理系统包括：彩色图像的处理、图像的几何变换以及图像的直方图均衡、图像的平滑化及锐化处理等增强功能。
Fundus image preprocessing system consists of Color image processing, image geometric transformation and the image histogram equalization, the image smooth and sharpen enhancement function.
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