And to have a 50% gray displayed, you need an image value of about 75% (you can see the red dotted line).

并有50%的灰色显示，则需要约75%的形象价值(你可以看到红色虚线)。

youdao

An improving noise eliminated difference template based on the analysis of object and background gray value also has been developed to eliminate the low frequency noise in image.

对图像中的低频噪声，基于对图像中目标与背景灰度值特点的分析，提出了改进的差分去噪声模板。

youdao

This paper introduces a new whole binarization method by using image gray statistical characteristic value as threshold.

本文给出了一种利用图像灰度统计特征值为阈值的全局二值化方法。

youdao