hi, please help me to find perimeter, area, aspect ratio, form factor, rectangularity, narrow factor from an binary object of leaf ?

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Oman Wisni 2018-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/421315-hi-please-help-me-to-find-perimeter-area-aspect-ratio-form-factor-rectangularity-narrow-facto

评论： Oman Wisni 2018-10-3

I using regionprops() for perimeter and area but can't. I don't understand how to define it and put it in each formula, cause I confused with the code I see in matlab and some example. please help me

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Image Analyst 2018-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/421315-hi-please-help-me-to-find-perimeter-area-aspect-ratio-form-factor-rectangularity-narrow-facto#answer_338957

See my Image Segmentation Tutorial: https://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862&sort=downloads_desc

If you still don't understand it, explain why.

im2bw() is the older, deprecated version of imbinarize(). They both do Otsu thresholding, though imbinarize() can change the threshold to adapt spatially to varying background in the image. imbinarize() was introduced in R2016a. im2bw() does only global thresholding.

The range of values used in determining the threshold are all the values in the image. If you use imbinarize() and choose locally adaptive thresholding then it will use only the values within the sliding window.

imfill() will fill all holes in a white/true/1 blob. It does not change the shape of outer boundaries - they remain exactly the same as before the fill.

If you use imclose(), it will dilate the blob which will fill in little bays in the outline and possible fill in some interior holes. Then it will erode the blob to try to bring it back to roughly the same size. The end result is that the blob will have a more rounded shape because all the little nooks and crannies and bays are filled in. It won't necessarily fill all interior holes unless you used a big enough kernel such that those holes were covered up during the dilation phase of the closing.

Oman Wisni 2018-10-3

thres_value.m

this my file and the image sir, please save all the value from regionprops and momen in Ms.Excel and make new folder for save all image sir. In code to find invariant moment I get problem, please fix it too sir. thanks