there a non-local means denoising article, along with the code. After debugging, the code is correct.里面有一篇非局部均值去噪的文章，并附有代码。经调试，代码正确。-there are a non-local means denoising article, along with the code. After debugging, the code is correct.

NLM denoising, popular in image processing, is here used for denoising time series data (ECG)