extracting frequency from 3D Matrix

Hi everyone,

i need to extract the frequency from a "sine wave" from this matrix. As you can see all the freqencies are between 17.1 and 17.2 MHz. But what i need is to extract the frequency of that "sine wave" which is 1 Hz.

To make it a bit easer i made a simplified image using this code:

img = zeros(200, 600); %demo image

numperiods = 1;

amplitude = 50; %pixels

offset = 100;

x = 1:dt:size(img, 2); %pixel subsampling for better resolution

y = sin(x*2*pi/size(img, 2)*numperiods)*amplitude + offset;

img(sub2ind(size(img), round(y), round(x))) = 1;

It is important for me that in the end, i can see the extracted frequency in spectrogram. Do you guys have an idea how to do this?

Thanks

cheers

[Rik]

I think the first step would be to extract the x,y data from the image. find with a threshold will probably do.

I don't have any good idea at this moment for how you could separate the several curves, but that should probably be next step, because after that the fitting of a sine will be trivial.

[Ashkan Taremi Zadeh]

Hi Rik,

Thank you for your suggestion. But i tried it but it doesnt really work. I have to think of another solution.

[Rik]

Ok, good luck. If you want help you will have to show what you tried.