以下在matlab中利用图像处理工具箱实现峰值信噪比（PSNR）和NC的源代码 -The following image processing toolbox for peak signal to noise ratio (PSNR) and NC source code in matlab

创建二维格网数据的简单nc文件，可在matlab的netcdf帮助页面查看详细用法。(Simple NC files for creating 2D grid data can be viewed in detail on the NetCDF matlab help page.)