Find coordinates of closest points in successive frames

I have a sequence of 10 images (Siemen star). I want to find the coordinates of points which overlap as I proceed in time (going from one frame to other). How to find the closest points that were within some distance of each other or were overlaping with each other as I proceed the frames? Thanks!

Answer 1

[Jaynik]

Hi,

You can use the opticalFlow object to track motion between two frames. There are several functions to compute optical flow like opticalFlowLK for the Lucas-Kanade method, opticalFlowFarneback for the Farneback method, etc. You can try the method appropriate for your case.

Here is a sample code to estimate the optical flow between two frames:

% Convert the images to grayscale if necessary using rgb2gray
img1 = imread('image1.jpg');
opticFlow = opticalFlowFarneback;
flow = estimateFlow(opticFlow, img1);
for i = 2:10 % For 10 images
    img2 = imread(sprintf('image%d.jpg', i));
    % Estimate the optical flow between the current and the next frame
    flow = estimateFlow(opticFlow, img2);
end

You can analyze the "flow.Magnitude" and "flow.Orientation" fields to find the overlapping points or points that are within a certain distance of their previous positions.

Please refer the following documentation links to read more about each functions:

• opticalFlow object: https://www.mathworks.com/help/vision/ref/opticalflowobject.html
• estimateFlow: https://www.mathworks.com/help/vision/ref/opticalflowhs.estimateflow.html
• opticalflowfarneback: https://www.mathworks.com/help/vision/ref/opticalflowfarneback.html