How to evaluate the height and width of an object in BW image

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sana3 sal 2018-5-2

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https://ww2.mathworks.cn/matlabcentral/answers/398610-how-to-evaluate-the-height-and-width-of-an-object-in-bw-image

评论： Walter Roberson 2020-6-13

Hello, I need to find the height and width of the following white object in this image.

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Alfonso 2018-5-2

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https://ww2.mathworks.cn/matlabcentral/answers/398610-how-to-evaluate-the-height-and-width-of-an-object-in-bw-image#answer_318276

编辑：Alfonso 2018-5-2

在 MATLAB Online 中打开

Try this

% Get boundary
bw = bwboundaries(binary_img);
bw = bw{1}; 
bw_x = bw(:, 2); %columns
bw_y = bw(:, 1); %rows
% height and width
leftCol = min(bw_x);
rightCol = max(bw_x);
top = max(bw_y);
bottom = min(bw_y);
width = rightCol - leftCol + 1;
height = top - bottom + 1;
% Crop the img
img_cropped = imcrop(binary_img, [leftCol, bottom, width, height]); 
imshow(img_cropped)