Interpolation of empty area in the image

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Michal Dudek
Michal Dudek el 24 de Abr. de 2016
Comentada: Michal Dudek el 25 de Abr. de 2016
I would like to interpolate values of empty places (value == 0) in my image (as shown below) without changing the values in other places.
I am able to create a mask of 0 and 1 with the places to interpolate, but I do not know how do the interpolation itself. I have tried roifill and imreconstruct functions, but it does not work properly for me. Function imfill also does not produce correct result as the empty places are not in closed areas.
Any ideas will be appreciated.

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Image Analyst
Image Analyst el 24 de Abr. de 2016
Did you try regionfill()? If your region is not closed, like the zeros go out to the edge of the image, then you might have to write in some value along the edge of the region so that there is something in the layer of pixels just outside the zero region
mask = yourImage == 0;
newImage = regionfill(yourImage, mask);
  3 comentarios
Image Analyst
Image Analyst el 24 de Abr. de 2016
No, roifill is kind of weird and non-intuitive - that's why they came up with regionfill(). With roifill(), you need to dilate the mask one layer with imdilate() before you can use roifill() or else it just smears in zeros. Kind of useless.
See Steve's blogs on the function: http://www.mathworks.com/search/site_search.html?q=roifill&c[]=blogs
Michal Dudek
Michal Dudek el 25 de Abr. de 2016
OK, thank you for clarification and your suggestions.
For now I devised an iterative method based on the Gerchberg–Saxton algorithm. So it goes like this:
1. FFT(image)
2. low-pass filtering
3. iFFT(f_image)
4. new_image = image + iFFT .* mask
5. repeat 1. for new_image as input
Still it is dependent on the filter size, but gives reasonable results - at least in the central region:
When I will update Matlab to latest version, I will try the regionfill function.

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