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

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?

Answer 1

[DGM]

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)

[Ali Almakhmari]

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]

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.

Answer 2

[Image Analyst]

You might take a look at inpaintCoherent or inpaintExemplar.