CODEWITHSUNDEEP
c#algorithmgraphicspattern-recognition
Alaor
Alaor

Reputation: 2191

Finding a wave graphic inside an image

I need some help with an algorithm. I'm using an artificial neural network to read an electrocardiogram and trying to recognize some disturbances in the waves. That's OK, and I have the neural network and I can test it no problem.

What I'd like to do is to give the function to the user to open an electrocardiogram (import a jpeg) and have the program find the waves and convert it in to the arrays that will feed my ANN, but there's the problem. I did some code that reads the image and transforms it into a binary image, but I can't find a nice way for the program to locate the waves, since the exact position can vary from hospital to hospital, I need some suggestions of approaches I should use.

Upvotes: 2

Views: 392

Answers (2)

3Dave
3Dave

Reputation: 29061

If you've got the wave values in a list, you can use a Fourier transform or FFT (fast Fourier transform) to determine the frequency content at any particular time value. Disturbances typically create additional high-frequency content (ie, sharp, steep waves) that you should be able to use to spot irregularities.

Upvotes: 1

Dave Swersky
Dave Swersky

Reputation: 34810

You'd have to assume a certain minimal contrast between the "signal" (the waves) and the background of the image. An edge-finding algorithm might be useful in that case. You could isolate the wave from the background and plot the wave.

This post by Rick Barraza deals with vector fields in Silverlight. You might be able to adapt the concept to your particular problem.

Upvotes: 0

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