How can I get the blue line in google maps screenshot? And also how can I fill the blanks in line?

Question

Zeynep Calik 2022-1-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1622320-how-can-i-get-the-blue-line-in-google-maps-screenshot-and-also-how-can-i-fill-the-blanks-in-line

回答： Image Analyst 2022-1-5

Ekran Görüntüsü (1033).png

I need the coordinates of the blue road in google directions. But there are gaps because there are texts in between. I can't get the only blue part. I tried to do as below.

map = imread('map3.png');
subplot(3,3,1);
imshow(map, []);
[R,G,B] = imsplit(map);
subplot(3,3,2);
imshow(R, []);
Istrech = imadjust(R,stretchlim(R));
subplot(3,3,3);
imshow(Istrech, [])
 
filteredImage = imbothat(Istrech, true(50));
subplot(3,3,4);
imshow(filteredImage, []);
 
threshold = 130;
mask = imfill(filteredImage, 'holes');
subplot(3,3,5);
imshow(mask, []);
mask2 = mask > threshold;
subplot(3,3,6);
imshow(mask2, []);
 
mask3= bwareaopen(mask2, 9);
subplot(3,3,7);
imshow(mask3, []);
mask4 = bwareafilt(mask3, 1);
subplot(3,3,8);
imshow(mask4, []);
BW2 = bwpropfilt(mask4,'perimeter',20);
subplot(3,3,9);
imshow(BW2, []);

I also need to embed this path as a MAtlab function in simulink like shown in below. How can I do that?

function y = fcn(u)
y = u;

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Answer 1

Image Analyst 2022-1-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1622320-how-can-i-get-the-blue-line-in-google-maps-screenshot-and-also-how-can-i-fill-the-blanks-in-line#answer_868040

testRGBImage.m

Use the Color Thresholder tool on the Apps tab of the tool ribbon.

See attached demo.

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Zeynep Calik 2022-1-4

its very helpful thanks

but Is there a way to fill the blanks?

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Answer 2

Image Analyst 2022-1-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1622320-how-can-i-get-the-blue-line-in-google-maps-screenshot-and-also-how-can-i-fill-the-blanks-in-line#answer_868095

Well you could try imclose() though that may change the shapes slightly. Or you could try searching for edge linking routines. See link and attachment, and do a web search yourself.

https://www.peterkovesi.com/matlabfns/#edgelink