How to find the broadest width of contour and calculate it.

Question

AliAlemana 2018-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/436539-how-to-find-the-broadest-width-of-contour-and-calculate-it

评论： Image Analyst 2018-12-27

Hello everybody,

I would like to know, where my contour(1440 in the picture) is broadest (considering the y-direction for the width) and calculate it.

I read a lot but I am not sure which suggestion would be the best for my case (interp2, In2bw,...).

Thank you very much for your help,

Alina

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Answer 1

Image Analyst 2018-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/436539-how-to-find-the-broadest-width-of-contour-and-calculate-it#answer_353158

在 MATLAB Online 中打开

Try this (untested)

binaryImage = grayImage >= 1440
binaryImage = bwareafilt(binaryImage, 1); % Extract only the largest blob.
[rows, columns] = size(binaryImage);
for col = 1 : columns
        thisColumn = binaryImage(:, col);
        topRow(col) = find(thisColumn, 1, 'first');
        bottomRow(col)= find(thisColumn, 1, 'last');
        heights(col) = bottomRow(col) - topRow(col);
end
maxHeight = max(heights);
columnsOfMaxHeight = find(heights == maxHeight); % Might be more than one column with max height!
% Draw it
hold on;
for k = 1 : length(columnsOfMaxHeight)
        thisCol = columnsOfMaxHeight(k);
        line([thisCol, thisCol], [topRow(thisCol), bottomRow(thisCol)], 'Color', 'r', 'LineWidth', 2)
end