find main area of image

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Very Determined
Very Determined 2019-12-6
编辑： Image Analyst 2019-12-10
Hello,
I am trying to lear how I can remove the small objects to find the main area of the image (the black section between the long lines (edges)? I want ot get rid of external and internal objects.
Thanks for the helps
Capture.PNG

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KALYAN ACHARJYA
KALYAN ACHARJYA 2019-12-6
#Approximate Here
se = strel('line',3,3);
BW1=imdilate(binaryImage,se);
BW2=bwareafilt(~BW1,1);
se = strel('line',3,3);
BW3=imerode(BW2,se);
se=strel('disk',7);
result=imclose(BW3,se);
imshow(result);
ui.png
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KALYAN ACHARJYA
KALYAN ACHARJYA 2019-12-6
编辑：KALYAN ACHARJYA 2019-12-6
#Try
BW = rgb2gray(imread('Capture.png'));
figure,imshow(BW)
BW = imbinarize(BW);
se = strel('line',3,3);
BW1=imdilate(BW,se);
BW2=bwareafilt(~BW1,1);
se = strel('line',3,3);
BW3=imerode(BW2,se);
se=strel('disk',7);
result=imclose(BW3,se);
figure,imshow(result);
Very Determined
Very Determined 2019-12-6
Great. It works. So I have to convert it from RGB first.
Thak you again.

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更多回答（1 个）

Image Analyst
Image Analyst 2019-12-6
Looks like you're doing an edge detection for some reason. Can I see the original image? Because usually edge detection is NOT what you want to do, for exactly the reasons you are seeing. It would probably be better to use a different segmentation method, like thresholding.
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Image Analyst
Image Analyst 2019-12-10
I changed the keyword to subject. It looks like the images are no longer there for some reason, perhaps because you took them down from your site.
Very Determined
Very Determined 2019-12-10
编辑：Very Determined 2019-12-10
Thank you.

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