{%hackmd SybccZ6XD %}
###### tags: `paper`

# A non-local algorithm for image denoising (NL-means)

Goal
> Denoising algorithms
> Recover the original image from a noisy measurement

Algorithm
> W: similarity between two pixels i and j depends on the similarity of the intensity gray level vectors
> 
> 
> normalizing constant
> 

Note
> The NL-means not only compares the grey level in a single point but the the geometrical configuration **in a whole neighborhood**
> 也就是說可以去找相似的texture