App designer - problem with thresholding image

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Teshan Rezel
Teshan Rezel 2021년 4월 10일
댓글: Teshan Rezel 2021년 4월 11일
Hi folks,
I have the app attached, in which I am encountering two issues. Firstly, when trying to threshold an image and displaying the thresholded image, it would appear my function calls aren't working as the image displayed is not thresholded. (ResinThreshold function works in live editor, but not when called in app designer). The thresholding function is below.
Thanks
function ResinThreshold(app)
imgGrey = rgb2gray(app.img);
[counts, ~] = imhist(imgGrey, 255);
T = otsuthresh(counts);
BW = imbinarize(imgGrey, T);
BW = bwareaopen(BW, 3000);
BW = imfill(BW, 'holes');
BW = bwperim(BW);
BW = imdilate(BW, ones(5));
BW = imerode(BW, ones(3));
BW = imfill(BW, 'holes');
app.img = app.img.*repmat(uint8(BW),[1 1 3]);
end
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DGM
DGM 2021년 4월 11일
I don't see any attached files.
Teshan Rezel
Teshan Rezel 2021년 4월 11일
hi @DGM, apologies! I thought I'd attached it...I've ammended the error!

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Image Analyst
Image Analyst 2021년 4월 11일
You need to display the output image
imshow(app.img);
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Image Analyst
Image Analyst 2021년 4월 11일
편집: Image Analyst 2021년 4월 11일
I ran it but didn't know what to do. There are no instructions. You should do what I do. Have a listbox listing all the images, then a series of controls (checkboxes, pushbuttons, etc.) that say "Step 1 : select an image", "Step 2 : Select any options", "Step 3 : Mark Points", "Step 4 : Analyze selected ponts" or whatever. That will essentially guide the user through the various steps without a user manual or training. Otherwise, attach the software manual for it (though I'm not sure I'll read it if it's too lengthy).
Teshan Rezel
Teshan Rezel 2021년 4월 11일
hi @Image Analyst, so the app should prompt you to select a folder with images in it on startup. once selected, pushing any of the buttons on the left of the table will move increment the relevant tally and display the next image in sequence.
I haven't listed any instructions as this is a very specific app designed for use by a very few people, and its based entirely on an existing "manual" methodology. Typically, they will go through hundreds of images on the app and tally them up, so it's not feasible to implement a listbox for images.

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