removing border pixels in a binary image

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Apoorva Maiya 2020-5-13

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回答： Apoorva Maiya 2020-5-17

采纳的回答： Apoorva Maiya

Hello all, below is a binary image

i want to remove the border pixels as shown in red (i used paint to highlight ) in the below image

I cannot use imclearborder for this task as it eliminates any pixel attactched to the border too. So i was thinking we could write a loop and set the first and last white oixel in each row to zero. I am not quite sure how to write the loop. Can anyone help me with this problem?

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Apoorva Maiya 2020-5-15

在 MATLAB Online 中打开

hey, below is the same image after skeletonization

I have managed to get the rightmost and leftmost white pixel in each row with the following code:

B = bwskel(img);
[rows,col]=size(B);
rightEdgeColumn = zeros(1,rows);
leftEdgeColumn=zeros(1,rows);
for row=1:rows
    col1 = find(B(row, :), 1, 'last');
    col2 = find(B(row, :), 1, 'first');
    if ~isempty(col1) && ~isempty(col2)
        rightEdgeColumn(row) = col1;
        leftEdgeColumn(row) = col2;
    end
end

Can anybody help me set those pixels to zero? I want the pixels in rightEdgeColumn and LeftEdgeColumn to be zero. Thank you in advance.

Apoorva Maiya 2020-5-17

thank you all for your response, i was able to write the code myself.

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Apoorva Maiya 2020-5-17

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https://ww2.mathworks.cn/matlabcentral/answers/525065-removing-border-pixels-in-a-binary-image#answer_432902

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B = bwskel(img); %skeletonized image
[rows,col]=size(B);
%% finding right edge and left edge
rightEdgeColumn = zeros(1,rows);
leftEdgeColumn=zeros(1,rows);
for row=1:rows
    col1 = find(B(row, :), 1, 'last');
    col2 = find(B(row, :), 1, 'first');
    if ~isempty(col1) && ~isempty(col2)
        rightEdgeColumn(row) = col1;
        leftEdgeColumn(row) = col2;
    end
end
%%removing the edge pixels
for i=1:length(rightEdgeColumn)
        k=rightEdgeColumn(i);
        if k==0 %% if the whole row has no white pixels
            B(i,:)=0;
        else
            B(i,k)=0;
        end
end