了解BMP文件的格式，实验二灰度变换,实验三图像平滑，实验四边缘提取，实验五频域变换，实验六高斯低通滤波器，实验七图像压缩，实验八 形态学变换-Learn BMP file format, two gradation transformation experiment, experiment three image smoothing, edge extraction experiment four, five frequency domain transformation experiment