Conversion to double from struct is not possible with bwconncomp

Question

M 2014-2-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/116042-conversion-to-double-from-struct-is-not-possible-with-bwconncomp

编辑： M 2014-2-17

So have this code but it keeps giving me an error at the bwconncomp line that says, Conversion to double from struct is not possible

for l=1:256 for m=1:256 for n=1:50

                    if (IMG(l,m,n) > 0.001)
                    if (( IMG(l,m,n) > 0.001)&&(IMG(l,m,n) < 0.19))
                        IMG(l,m,n)=1;
                    else
                        IMG(l,m,n)=0;
                    end
                    end
                end 
            end
        end

cc = zeros(256,256,50);

IMGT = zeros(256,256);

for ii = 1:50

     IMGT=IMG(:,:,ii);
     cc(:,:,ii) = bwconncomp(IMGT);

end

Any idea where the problem can be?

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Answer 1

Image Analyst 2014-2-13

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That's not a good way to binarize if you're simply comparing to a threshold.

Explain exactly what "didn't work for me" means. Do you get an error message?

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M 2014-2-16

for l=1:256 for m=1:256 for n=1:50

                    if (IMG(l,m,n) > 0.001)
                    if (( IMG(l,m,n) > 0.001)&&(IMG(l,m,n) < 0.19))
                        IMG(l,m,n)=1;
                    else
                        IMG(l,m,n)=0;
                    end
                    end
                end 
            end
        end

So its like a band pass filter to pass some frequencies and turn them into white, and set the rest to black.

Image Analyst 2014-2-16

That's not going to turn it into a structure. Anyway the whole thing (triple nested for loop) can be done a lot faster simply by doing this single line

IMG = IMG > 0.001 & IMG < 0.19;

No for loops needed at all. You should learn how to write vectorized code.

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