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The discriminating process includes gray transformation, region edge enhancement, region segmentation et al. 识别过程包括灰度变换、区域边缘锐化、区域分割、细化处理等步骤。
Key words multisource image, look_up_table, histogram, gray transformation, image processing system, geographic information system. 关键词多源图象，查找表，直方图，灰度变换，图象处理系统，地理信息系统.
After the gray transformation and the histogram equalization,these images were filtered by a frequency-domain homomorphic filter,hence noises in the images were greatly reduced. 利用自开发软件,对图像进行灰度变换和直方图均衡化处理后,采用频域同态滤波的方法对图像进行降噪滤波处理。
His hair became gray when he was only forty. 他刚刚四十岁时，头发就变得灰白了。
His face turned gray as he heard the bad news. 听到这个坏消息后，他的脸变得苍白。
A fresh coat of paint can transform a room. 房间重新粉刷一遍可大为改观。
piecewise linear gray transformation 分段线性灰度变换
It is a medium- size samsonite, and it's gray. 它是一个中型的灰色绅耐特皮箱。
The blue shirt and gray tie are a good match. 蓝衬衫和灰领带很相配。
Stolen chips can find access to the gray market. 偷来的芯片可在水货市场上找到销路。
He was still looking gray and very tired. 他看上去仍然面色苍白,疲惫不堪。
His black hair was tinged with gray. 他的黑头发带着一点灰白。
A yellowish gray to pale orange yellow. 土黄色，浅黄褐色一种黄灰色到淡桔黄色
Gray or white with or as if with age. 灰白的因年老而头发灰白的
A horse having a coat of mottled gray. 菊花青马带有斑点的灰色毛皮的马
A pale yellowish pink to yellowish gray. 石膏色浅黄粉色到黄灰色
These people who were young fifty years back are now gray haired. 50年前的年轻人，现在已经白发苍苍了。
As soon as the red cock squared the gray one, it squared off. 那红公鸡一看见灰公鸡，就拉开斗架的姿势。
Miss Gray chooses voices that blend with each other for the singing group. 格雷小姐挑选嗓音互相和谐的人组成合唱队。
The bride, in a light gray chiffon gown, was more charming. 新娘穿著一条浅灰色薄绸睡衣,显得更加迷人。