denoise: Use a given dictionary D to denoise image.

In GSCAD: Implementing GSCAD Method for Image Denoising and Inpainting

Description

Denoise Y give D in Y=DA.

Usage

denoise(Y, D, sigma)

Arguments

Y	Each column of Y is a vectorized image patch to be denoised.
D	D is the dictionary used in Y=DA to denoise.
sigma	Noise level.

Details

See https://arxiv.org/abs/1605.07870

Value

The denoised matrix Y.

Examples

I = lena_crop #use a smaller image as an example
## add noise
sigma=20;
I_noise=AddNoise(I,sigma)
## spliting image into patches
m=64;
Y_nc = ImageSplit(I_noise,sqrt(m),sqrt(m));
mu=colMeans(Y_nc)
Y=Y_nc-rep(mu,each=nrow(Y_nc))
## use ODCT dictionary
D0=ODCT(64,100)
## denoise
## Not run: 
Y_denoise=denoise(Y,D0,sigma)

## End(Not run)

GSCAD documentation built on Oct. 6, 2017, 5:04 p.m.