How to measure the distance between two points in a list of images

I need to measure the distance between the ruler stick and the lips which is marked in dotted line for a sequence of images

Just wonder if anyone could suggest a starter for me or a flowcahrt to do that

Answer 1

[Drishti]

Hi BA,

I understand that you are trying to measure the distance between the ruler stick and the lips present in the provided image.

To calculate the distance, you can follow the provided steps:

• You can first detect the lines in the image using method like Hough Transform.
• After the detection of lines, determine the endpoints of the detected lines that correspond to the ruler and the lips by examining the relevant pixels.
• Compute the distance between the midpoints of the ruler line and the lips line using the Euclidean distance formula.

Refer to the code snippet to get an understanding of detecting lines using 'hough' function:

% Detect lines using Hough Transform
[H, T, R] = hough(edges);
peaks = houghpeaks(H, 5, 'Threshold', ceil(0.3 * max(H(:))));
lines = houghlines(edges, T, R, peaks, 'FillGap', 20, 'MinLength', 30);

For more information, you can refer to the MATLAB Documentation of 'hough' function:

https://www.mathworks.com/help/releases/R2024b/images/ref/hough.html

I hope this helps in getting started.