（1）实现图像文件的打开、保存、另存为、打印功能；
（2）图像直方图统计和直方图均衡，要求显示直方图统计，比较直方图均衡后的效果；
（3）能对图像加入各种常见噪声，并通过几种滤波算法实现去噪并显示结果。比较去噪效果；
（4）频谱处理，能够分析图像频谱，显示频谱图；
（5）实现空域滤波中的平滑滤波和锐化滤波。((1) realize the image file open, save, save as, print function;
(2) histogram statistics and histogram equalization, histogram statistics are required to compare the effect of histogram equalization;
(3) the image can be added to a variety of common noise, and through several filtering algorithm to achieve denoising and display the results. Compare the denoising effect;
(4) spectrum processing, can analyze the image spectrum, display spectrum;
(5) smoothing filtering and sharpening filtering in spatial filtering are realized.)