How to detect a suitable pattern from a video?

Hi, I have a video (in the .avi format). The video (1 hour length- 25 fps) is of a wind turbine with blades rotating. I want to capture the points during the length of video when one of the blade tip is in line with the tower of the turbine.

I understand that this is possible with MATLAB using Computer vision and Image processing toolbox. Can someone guide me better on this?

Also, I just have a standard MATLAB version. Can I get trial versions for doing this problem statement?

Answer 1

[Image Analyst]

You can get help if you post your code and image.

Yes you can get trial versions. Just call or click the sales department.

[Ashish]

I don't have a code yet. I am just assessing how to do it.

I have a video with the wind turbines rotating .Its not an image. To give an example, I am attaching a figure which shows the wind turbine (original image). I want to calculate the number of times one blade crosses the tower (black line).

Hope I am clear enough.

[Image Analyst]

Just take the profile along one line. There will be two "bumps" in the profile when it's not aligned, and only one when the blade is over the post.

Answer 2

[Dima Lisin]

If your camera is stationary, you can use vision.ForegroundDetector to segment out the moving blade. You can then use regionprops or vision.BlobAnalysis to analyze the shape further.