# Is Pixel Interpolation possible in MATLAB? If so, how?

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Ali Almakhmari on 30 Jul 2022
Answered: Image Analyst on 31 Jul 2022
Hey guys. So I have a picture, but unfortunately, some pixels in it are completely black (the RGB values are 0,0,0). For those specific pixels, I would like to do some sort of pixel interpolation (replace those black pixels by a pixel that is interpolated from the surrounding area). I tried doing it myself but I struggled with multiple things, one of them is how to tell MATLAB what are the pixels that I want to replace and what are the pixels that I want it to interpolate from. Any ideas?

DGM on 30 Jul 2022
You should be able to use regionfill()
% a test array with a zero pixel
A = uint8(randi([0 255],5,5));
A(3,3) = 0;
imshow(A)
% create a mask that describes the zeros
mk = A == 0;
% inpaint
B = regionfill(A,mk);
imshow(B)
##### 2 CommentsShow NoneHide None
Ali Almakhmari on 30 Jul 2022
I tried implementing this on my image but its hardly working cause its a colored image. I tried comverting it to gray and work on it, which it did, but converting it back to colored after using regionfill is very diffcuilt. Any suggestions?
Image Analyst on 31 Jul 2022
Maybe regionfill try it on each channel one at a time
% Split RGB image apart into separate color channels.
[r,g,b] = imsplit(rgbImage);
% Fill holes in each channel individually.
r = regionfill(r, mask);
g = regionfill(g, mask);
b = regionfill(b, mask);
% Recombine
rgbImage = cat(3, r, g, b);
There are other ways (some are perhaps more "accurate"), but this might be the simplest and be good enough.

### More Answers (1)

Image Analyst on 31 Jul 2022
You might take a look at inpaintCoherent or inpaintExemplar.

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