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Can I threshold this further if so how?

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Oliver Mashari
Oliver Mashari 2018-3-11
回答： Prajit T R 2018-3-14
Hi I have this image:
is there anyway I could process this further so that I am only left with an image with only parts like this:
I have used this code to produce this so far:
I = imread('Scan4Loc1.png');
A = rgb2gray(I)
imshow(A)
J = filter2(fspecial('sobel'),A);
min_matrix = min(J(:))
max_matrix = max(J(:))
figure
imshow(J)
K = mat2gray(J);
min_image = min(K(:))
max_image = max(K(:))
figure
imshow(K)

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回答（1 个）

Prajit T R
Prajit T R 2018-3-14
Hi Oliver. I think the im2bw function may be of help to you. I tried the following code with the image you had attached and it seems to be working fine. Of course, depending upon your use-case, you would have to manually try different values for the variable 'level' until you get it right. The value 0.515 seems to be appropriate for this particular image.
I = imread('image.png');
level=0.515
A = rgb2gray(I)
imshow(A)
BW = im2bw(I, level)
figure
imshow(BW)
Cheers

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