打开一副BMP图片，读取BMP文件中的数据，获取图片中像数点RGB的数值，显示到屏幕界面中。（如果不能打开BMP可以先试着打开YUV文件，然后计算第二步的内容）

将RBG数据转换成YUV格式的，并计算Y分量的平均值，统计出图像灰度直方图，显示直方图。

将RGB数据表述的图像进行2：1的下采样，原来图像是2Xx2Y的宽高大小，新的图像为XxY的大小图像，并显示到界面中。-Open a BMP picture, read BMP file data, the number of points for pictures like the RGB values ​ ​ to the screen interface. (If you can not open BMP can first try to open YUV file, and then calculate the contents of the second step) to RBG data into YUV format, and calculate the average value of the Y component, the statistics of the image histogram, histogram display. Expressed in the RGB image data is 2:1 downsampling, the original image is a 2Xx2Y size width and height of the new size of the image is XxY images and displayed on the interface.