中文说明：
它所描述的是不同色彩在整幅图像中所占的比例，而并不关心每种色彩所处的空间位置，即无法描述图像中的对象或物体。颜色直方图特别适于描述那些难以进行自动分割的图像。
English Description：
It describes the proportion of different colors in the whole image, and does not care about the spatial position of each color, that is, it can not describe the object or object in the image. Color histogram is especially suitable for describing images that are difficult to segment automatically.