对lena图像进行旋转、剪切、伸缩变换，并添加噪声，然后进行直方图均衡化、维纳滤波、低通高通滤波、频谱分析等操作，学习了图像处理的基本内容，程序简单易懂~-For lena image rotation, cropping, stretching transform and add noise, and then histogram equalization, Wiener filter, low-pass high-pass filtering, spectrum analysis, oper