能够将小于图像文件1/4大小的任意文件注入24bit的bmp图像，注入后图像大小不变，显示效果不变，如图像大小为1M，那么可以注入最大为256K的文件-able to image files smaller than 1 / 4 the size of arbitrary files into the 24bit bmp image, after injection of the same size images show the same effects, such as image size