如何计算图像的对比度? [英] How to calculate the contrast of an image?

问题描述

假设我有一个opencv BGR图像img，如何计算该图像的对比度?

Let's say I have an opencv BGR image img, how to calculate the contrast of that image?

推荐答案

对比度的一个定义是

One definition of contrast is RMS Contrast, it can be calculated as follows:

首先，将BGR图像img转换为灰度:

First, transform the BGR image img to greyscale:

img_grey = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

最后，计算灰色图像像素强度的标准偏差:

Lastly, calculate the standard deviation of the greyed image pixel intensities:

contrast = img_grey.std()

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