说明：  基于直方图均衡的低照度图像增强, 首先将图像由RGB空间转换到HSI空间，然后对HSI空间亮度分量（I分量）的灰度直方图进行均衡化处理，提高图像的亮度，然后转换回RGB空间显示
(Illumination image enhancement based on histogram equalization, First, convert the image from RGB space to HSI space, and then the luminance component of the HSI space (I component) histogram equalization processing to improve the brightness of the image, and then converted back to RGB space for display)