中文说明：
说明：PCA图像降噪新算法-LPG PCA，全名叫做Two-stage Image Denoising by Principal Component Analysis with Local Pixel Grouping。内含算法代码和数据集，均经本人实测，可进行灰度图像和RGB图像的降噪，且PSNR和SSIM指标明显好于小波滤波、K-SVD等经典算法。值得学习图像降噪的看看！
English Description：
Description: the new algorithm of PCA image denoising - LPG PCA, full name is two stage image denoising by principal component analysis with local pixel grouping. It contains algorithm code and data set, which are measured by myself. It can denoise gray image and RGB image, and PSNR and SSIM indexes are better than wavelet filtering, K-SVD and other classical algorithms. It's worth learning about image noise reduction!