中文说明：中位数、模式、最大值和最小值用于表示图像
English Description：
Median, mode, max and min are used to represent image data or information. They are collectively called as the measures of central tendency. These descriptive measures have bit differences from one another that play an important role in feature extraction. The mode is the most dominant pixel in the image. Median is a middle pixel from an ordered set of data that is in the middle of an image. Max and Min are the maximum and minimum intensity pixel in the image.