counting the light frequency in a video

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Luke Abellanosa 2021-2-4

评论： Walter Roberson 2021-2-4

hello can someone suggest a way to count the frequency value in a video similar to this research experiment

i was able to find this code though for some reason the frequency value does not change even if i inputed a different video

vidObj = VideoReader( '1.avi' ) ;

nFrames = vidObj.NumberOfFrames ;

tFrame = (1:nFrames) / vidObj.FrameRate ;

ghostCom = zeros( nFrames, 1 ) ;

for fId = 1 : nFrames

grayImage = rgb2gray( read( vidObj, fId )) ;

ghostCom(fId) = sum( grayImage(:) ) ;

end

figure() ; clf ;

set( gcf, 'Color', 'White', 'Units', 'Normalized', ...

'OuterPosition', [0, 0.1, 1, 0.6] ) ;

plot( tFrame, ghostCom/max(ghostCom), 'b' ) ;

set( gca, 'YTick', [0, 1] ) ;

xlabel( 'Time [s]' ) ;

[r] =risetime(ghostCom);

FREQUENCY =numel(r)/60;

sorry i'm new to this thank you in advance for the reply.

Walter Roberson 2021-2-4

That has nothing to convince me that this can be modeled as bi-level.

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