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[S.Area] not supported for code generation

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tsai kai shung
tsai kai shung 2017-10-26
评论： Walter Roberson 2017-10-27
hey guides i use this function on the simulink but show the error:Referencing a component from array of non-scalar values is not supported for code generation.
Function 'MATLAB Function' (#35.204.212), line 8, column 25:
"[S.Area]"
Launch diagnostic report.
what can replace this to success simulation on simulink.
function y = areaimg(u)
bw2 = zeros(240,320);
ss = 20;
B = 6000;
img_bw2 = bwareaopen(u,ss,8);
[L2,num2]=bwlabel(img_bw2,8);
S = regionprops(L2,'Area');
bw2 = ismember(L2, find([S.Area] < B));
y = bw2;
end

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采纳的回答

Walter Roberson
Walter Roberson 2017-10-26
编辑：Walter Roberson 2017-10-26
Just loop. You are generating code anyhow, so the loop should be efficient.
Have you considered using bwareafilt() instead ?
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tsai kai shung
tsai kai shung 2017-10-27
thanks for your help. by the way the false(size(L2))=zeros(size(L2))?
Walter Roberson
Walter Roberson 2017-10-27
false() and zeros() are not the same: false() creates an array of type logical and zeros() creates an array of type double.

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更多回答（2 个）

Image Analyst
Image Analyst 2017-10-27
What is num2? Is it 0, and therefore S is empty? If S is empty, then trying to access S.Area would throw an error.
Image Analyst
Image Analyst 2017-10-27
The whole function can be done with this single line of code
y = bwareafilt(u, [1, 6000]);

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