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I remember an old post here http://answers.opencv.org/question/63358/detect-multiple-leds-and-their-flashing-frequency/ and this one too http://answers.opencv.org/question/65545/led-blinking-frequency/ and may be this code will solve your problem https://github.com/LaurentBerger/LedBlinkingFrequency

I remember an old post here http://answers.opencv.org/question/63358/detect-multiple-leds-and-their-flashing-frequency/ and this one too http://answers.opencv.org/question/65545/led-blinking-frequency/ and may be this code will solve your problem https://github.com/LaurentBerger/LedBlinkingFrequency

I remember an old post here http://answers.opencv.org/question/63358/detect-multiple-leds-and-their-flashing-frequency/ and this one too http://answers.opencv.org/question/65545/led-blinking-frequency/ and may be this code will solve your problem https://github.com/LaurentBerger/LedBlinkingFrequency

I try to understand your question : you have go got led blinking at frequency=24kHz :

A webcam (good one with a sensor regulated in temperature) grab a picture : it means light is accumulated for 1/1000s (1/1000 just an example) grey level is g(24000).

Now if frequency changed what happens to grey level :

How to read this curve : frequency 24000Hz pixel level is 1 frequency 24500 Hz pixel level is 1.013 frequency 23554 Hz pixel level is 1.013

frequency range is given by shannon law 24000Hz +/- 250Hz

I integration time is changed you can get a new curve (0.0007s) you get a new curve :

I say : Good luck it seems that it is possible