Image processing and contour detection

Question

KATHAN BHAVSAR 2023-4-12

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回答： Image Analyst 2023-4-15

With respect to the image below, how can I detect the the upper (red) and lower (green) contour on the boundaries shown n the image below. Also, how do I calculate the distance between the two boundaries (blue)?

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Answer 1

Sachin 2023-4-14

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Hi

I understand that you want to find the contours in the image.

I suggest you to use Image processing and Computer Vision Toolbox. The toolbox provides two functions -

‘bwboundaries' – This function is used to compute the boundary of a binary image . It takes a binary image as input and computes the boundary of the connected region in the binary image
‘bwtraceboundary’ – This function is used to trace a boundary in a binary image.It takes a binary image as input and a starting point on the boundary and trace the boundary of the connected region in the image.

These function provides boundary coordinates that can be used find the distance between two points

grayImage = rgb2gray(image);
threshold = 50; % Set threshold value
binaryImage = grayImage > threshold;
boundaries = bwboundaries(binaryImage);
imshow(image);
hold on;
for k = 1:length(boundaries)
    boundary = boundaries{k};
    plot(boundary(:,2), boundary(:,1), 'b', 'LineWidth', 2);
end