GMU:Connecting Max to the World/Frederic Blais-Belanger/Generate signal from video: Difference between revisions

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[[File:Video_connection.png|400px]][[File:Feed_selection.png|400px]]
[[File:Video_connection.png|400px]][[File:Feed_selection.png|400px]]


Now that I have an input, I needed to generate informations out of it in order to trigger the signal at the end of the patch. To do so, I based my patch with this [  "frame-differences" tutorial]. What the patch actually does is to calculate the difference in pixels between the image and its previous one by using a luma channel. That way, everything that is not moving become black and the difference between images (so what is in motion) becomes visible in white.
Now that I have an input, I needed to generate informations out of it in order to trigger the signal at the end of the patch. To do so, I based my patch with this [  "frame-differences" tutorial]. In this patch, the "jit.op" object calculates the difference in pixels between the image and its previous one and the "jit.rgb2luma" object transfer it as a luma channel. That way, everything that is still in the image become black and the difference between images (so what is in motion) becomes visible in white.


[[File:Frame_difference.png|400px]][[File:Luma_channel.png|400px]]
[[File:Frame_difference.png|400px]][[File:Luma_channel.png|400px]]
The "jit.3m" object then gives us a single value of the average of this difference. It is with this value that I will trigger the output and thus control the vibration/motion that will be send to the Bioluminescent algae. To trigger the output, I just give a number (that can be adjusted with a slider) that become the threshold.
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