How can i somehow autofill black-spots in an RGB image.

Answer 1

[Aditya Adhikary]

These may help: imfill and regionfill.

[JAI PRAKASH]

Hey Thanks, But it does not work for complex problems

I used following code:

    newimage=imread('City_AskAutofill.jpg');
    R = newimage(:,:,1); % splitting RGB because regionfill need grayscale.
    G = newimage(:,:,2);
    B = newimage(:,:,3);

    mask = uint8(R) < 2;
    mask = imfill(mask,'holes');
    mask = imerode(mask,strel('disk',10));
    mask = imdilate(mask,strel('disk',20));
    R_autofill = regionfill(R,mask);

    mask = uint8(G) < 2;
    mask = imfill(mask,'holes');
    mask = imerode(mask,strel('disk',10));
    mask = imdilate(mask,strel('disk',20));
    G_autofill = regionfill(G,mask);

    mask = uint8(B) < 2;
    mask = imfill(mask,'holes');
    mask = imerode(mask,strel('disk',10));
    mask = imdilate(mask,strel('disk',20));
    B_autofill = regionfill(B,mask);

    newimage_autofill(:,:,1)=R_autofill;
    newimage_autofill(:,:,2)=G_autofill;
    newimage_autofill(:,:,3)=B_autofill;
    imtool(newimage_autofill)  % this is the image which you are seeing above.

But this approach is not effective on other problem, like I have mentioned further below.

 How can I improve this approach. Thanks

Answer 2

[Image Analyst]

MATLAB does not have a sophisticated region filling algorithm like the bandage tool in Photoshop. If you want/need something like that, use Photoshop or figure out what algorithm they used and program it up yourself.