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Published on Feb 18, 2011
This video demonstrates the use of Matlab to analyze video footage of a Tuned Liquid Column Damper for the heights of the two liquid columns. The output can be converted to time and length (in mm say) using the rulers to get a scale (mm per pixel say) and the frame rate of the video. The 'redness' of the liquid is the key here: the video is split into RGB and the red channel isolated and converted to black and white once a filter is applied. This image is then scrubbed to get rid of any objects smaller than a threshold size, leaving only the liquid of the column. The image is then split in two at the centre of the bounding box to analyze each column separately. Since a black and white image is represented by a matrix of 1 and 0s, summing the columns of the matrix (ie the vertical direction) gives the column height in pixels. A few other adjustments are needed, but that's the basic idea.