How can i select few random pixel positions from a frame of video and view the variation of pixel intensities at that position in all frames?

Question

sasithra devi 2016-2-1

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https://ww2.mathworks.cn/matlabcentral/answers/265995-how-can-i-select-few-random-pixel-positions-from-a-frame-of-video-and-view-the-variation-of-pixel-in

回答： Mahendran Subramanian 2017-8-9

Actually i need to plot the variation of pixel intensities of a video at fixed random positions. I got the random positions using randperm function, i am struggling in the plot, how can i get the plot of the intensities and video on the same window. I want ti get the plot as a continuous signal with different colors for different pixel positon?