I need to correct this code to fill each connected component in the image New_bw

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abdelrahim hashem 2017-11-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/368778-i-need-to-correct-this-code-to-fill-each-connected-component-in-the-image-new_bw

评论： Image Analyst 2017-11-25

clear all;
i = imread('resturant.jpg');
g = rgb2gray(i);
Canny_g = edge(g,'Canny');
bw = im2bw(g);
CC = bwconncomp(bw)
New_bw = zeros(size(g));
for j = 1:1:CC.NumObjects
      Temp = zeros(size(g));
      Temp(CC.PixelIdxList{j}) = 1;
      New_bw = New_bw + Temp;
      clear Temp;
end
figure, imshow(New_bw), title('image of components before'), hold on;
Regs = regionprops(CC,'BoundingBox','Centroid')
MatFill = zeros(10,1);
for i = 1:10  %CC.NumObjects
      pts = Regs(i).BoundingBox;
      plot(pts(1),pts(2),'*b');
      MatFill(i,1) = round(pts(1));
      MatFill(i,2) = round(pts(2));
end
figure, imshow(New_bw), title('image of components after'), hold on;
MatFill
ImFill = imfill(New_bw,MatFill,4);
figure, imshow(ImFill), title('after filling'), hold on;

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abdelrahim hashem 2017-11-23

it gives an error in the statement:: ImFill = imfill(New_bw, MatFill,4)

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回答（3 个）

Walter Roberson 2017-11-23

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https://ww2.mathworks.cn/matlabcentral/answers/368778-i-need-to-correct-this-code-to-fill-each-connected-component-in-the-image-new_bw#answer_292752

在 MATLAB Online 中打开

The "locations" parameter must be linear indices. https://www.mathworks.com/help/images/ref/imfill.html#inputarg_locations

MatFill(i) = sub2ind(size(CC, round(pts(2)), round(pts(1)) );

Note the bounding box is in X, Y order, but that indexing is in Y, X order.

I would point out, though, that you should not assume that the lower left corner of the bounding box of the object definitely is or definitely is not occupied. If it is not occupied then the imfill is going to fill around the connected component, everything over to the edge of the next connected component over.

I think you should be considering asking to fill holes instead.

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abdelrahim hashem 2017-11-23

编辑：Walter Roberson 2017-11-23

在 MATLAB Online 中打开

OK, but still error in using:

for i = 1:CC.NumObjects
      pts = Regs(i).BoundingBox;
      MatFill(i) = sub2ind(size(g), round(pts(2)), round(pts(1)));
end
%%%%gives "Out of range subscript".

Walter Roberson 2017-11-23

I am not sure at the moment. I have not tried to regionprops on a CC before.

I think I am going to bed now.

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Image Analyst 2017-11-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/368778-i-need-to-correct-this-code-to-fill-each-connected-component-in-the-image-new_bw#answer_292831

在 MATLAB Online 中打开

I'm not familiar with this:

ImFill = imfill(New_bw,MatFill,4);

usually I'd do

filledImage = imfill(binaryImage, 'holes'); % Fill all holes in all blobs.

Not sure why you're trying to compile a list of locations to fill. Please attach your restaurant.jpg image and I'll see what I can do.

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abdelrahim hashem 2017-11-24

编辑：abdelrahim hashem 2017-11-24

Now I knew the error; I have to convert the matrix of binary image into logical. When I convert it to logical, the next command has run:

BW = logical(BW);

BW2 = imfill(BW,XY_indices,8); XY_indices is the index of row and column of corner of all Bounding Boxes

Image Analyst 2017-11-24

在 MATLAB Online 中打开

You should have done:

New_bw = false(size(g));

instead of

New_bw = zeros(size(g));

That said, the code is still weird, but anyway I know you don't want anymore help since you haven't attached your image after two requests, so I assume it's working to your satisfaction (quirky as it is), so good luck with the rest of the project.

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abdelrahim hashem 2017-11-24

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https://ww2.mathworks.cn/matlabcentral/answers/368778-i-need-to-correct-this-code-to-fill-each-connected-component-in-the-image-new_bw#answer_293018

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abdelrahim hashem 2017-11-25

编辑：abdelrahim hashem 2017-11-25

Thanks, Image Analyst. I depended on the number of pixels in each region/objects in my previous work, Already I have published two papers in this direction, though I think that I need other properties/features to make good selection for text character regions and also to discard non-text character regions rather than number of pixels. Thanks again