@A_A i was testing ICA with FFT and noticed an error for the printing the bpm value... however that doesn't fix the FFT obviouslty

@A_A so I did some tests with ICA and FFT and bandpass where I mixed some oscillating signals together and tried to extract the frequency with FFT...

based on this:

scikit-learn.org/stable/auto_examples/decomposition/…

@A_A so far it seemed like it is working... I will continue some more tests tomorrow...

@TanMath @TanMath In this image, what we perceive as amplitude is supposed to remain constant (constant amplitude). It is not. The camera is constantly adjusting white balance and exposure.

@TanMath When you provide the image as an input to the web cam, please make sure that it is the only thing that the camera sees. Try to load the pulsating gif on your phone and hold it in front of the camera so that it fully occupies its field of view. Normally, I would do a pulsating gif on octave or matlab and save it to a gif so that you know exactly what the input frequency is. But short of that, I found this: gph.is/2cSY2iW You can probably find its exact frequency.

@TanMath Use that as the standard input and record its output. It is important to have a periodic variation in the input to assess how bad is the frame rate effect too.

@TanMath I don't understand what you mean by "an oscillatory signal in the background" The first periodic plot looks more as what I would expect. The second signal seems to be all over the place.

@TanMath What do you mean by normalised intensity? You divide the spatial average by 256 or normalise it in a different way?

@TanMath Usually, applications will not re-initialise the camera. Can you find this dialogue box in your web cam settings? totalrecorder.com/Screenshots/Device%20Properties.gif

@TanMath This is the standard webcam settings dialogue provided by the web cam's driver (in windows).

@TanMath The WIndows SDK has a call to show this. For more information on how to get to it from within openCV: stackoverflow.com/questions/17114216/…

When you test ICA, FFT etc, please make sure that you do it with your specific signal.

@A_A yeah I am pretty sure the full gif was in the view and only the gif....

I took a picture of myself, and gave it to a friend, who made a oscillating gif

@A_A first and second? which colors? there seems to be overall a periodic nature to the background which is weird...

@A_A standardized with scikit-learn

@A_A lol every time I come to the chatroom you leave... are you in a different timezone now btw? (you said you were travelling)

@A_A the settings from opencv... what should I be changing?

@A_A Do you mean with the video signal? cuz I made a synthetic signal and was testing on that... like from the scikit learn sample I sent... i pretty much used that, removed the PCA part, and added an FFT to the end to make sure the FFT and the ICA work fine together...

@A_A so like how the signal decreases and increases?

Yeah I really don't know how to fix the auto-exposure...

@A_A Like I tried setting the exposure parameter with opencv but nothing changed... same with the frame rate... so I assume it is not supported with my camera...

BTW my camera is called an EasyCamera... there doesn't seem to be much documentation on it or if there is i have not found it yet...