Noise Reduction Tools

[Michael Alonge]

Great thank you!

I have used some different filters and played around with some parameters. 
I also have performed a bunch of iterations of these filters to get more 
dramatic effects. 

On Thursday, July 30, 2015 at 11:51:33 PM UTC-7, Emmanuelle Gouillart wrote:
>
> Hi Michael, 
>
> did you try to change the value of the sigma_range parameter? 0.1 seems a 
> bit low to me (ie, you only smooth a pixel with values very close to it). 
> You can also try to change the value of the win_size parameter: 
> increasing it will result in more smoothing. 
>
> Also the bilateral filter is a very good generic-purpose denoising 
> filter, but if you want to start denoising with a function with less 
> parameters, you can try the median filter skimage.filters.median 
>
> Best, 
> Emmanuelle 
>
> On Thu, Jul 30, 2015 at 04:26:55PM -0700, Michael Alonge wrote: 
> > Here is the code: 
>
> > import sys, math 
> > import numpy as np 
>
> > import matplotlib.pyplot as plt 
> > from skimage import io, color, filters, data 
> > from skimage.filters import threshold_otsu 
> > import matplotlib.image as mpimg 
> > from skimage.restoration import denoise_tv_chambolle, denoise_bilateral 
> > import skimage 
>
> > rawimg = open('1_A.png') 
> > img = mpimg.imread(rawimg) 
>
> > denoised_img = denoise_bilateral(img, sigma_range=0.1, sigma_spatial=15) 
> > #denoised_img2 = denoise_tv_chambolle(img, weight=0.1, 
> multichannel=True) 
>
> > plt.imshow(denoised_img1) 
> > plt.show() 
>
> > On Thursday, July 30, 2015 at 4:23:34 PM UTC-7, Michael Alonge wrote: 
>
> >     Hello, 
>
> >     I have an image that I would like to do some smoothing over on.  
>
> >     Lets say there is a faint red spot on a white background. I would 
> like to 
> >     apply some algorithm that will smooth over the red with the white 
> pixels 
> >     surrounding the red pixels. 
>
> >     I thought this would be an application for the noise reduction tools 
> ... 
>
> >     http://scikit-image.org/docs/dev/auto_examples/plot_denoise.html  
>
> >     ... but the picture output looked the same as before. 
>
> >     What is the best algorithm for smoothing over pixels by re assigning 
> a 
> >     pixel value with the average value of the pixels surrounding it? 
>
> >     Thank you 
>
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