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Karsten SchmidtTo avoid a massive OpenCV dependency for a current project I'm involved in, I ended up porting my own homemade, naive optical flow code from 2008 and just released it as a new package. Originally this was written for a gestural UI system for Nokia retail stores (prior to the Microsoft takeover), the package readme contains another short video showing the flow field being utilized to rotate a 3D cube:<a href="https://thi.ng/pixel-flow" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://thi.ng/pixel-flow</a>I've also created a small new example project for testing with either webcam or videos:<a href="https://demo.thi.ng/umbrella/optical-flow/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://demo.thi.ng/umbrella/optical-flow/</a><a href="https://mastodon.thi.ng/tags/ThingUmbrella" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ThingUmbrella</a> <a href="https://mastodon.thi.ng/tags/OpticalFlow" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#OpticalFlow</a> <a href="https://mastodon.thi.ng/tags/ImageAnalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ImageAnalysis</a> <a href="https://mastodon.thi.ng/tags/ComputerVision" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ComputerVision</a> <a href="https://mastodon.thi.ng/tags/TypeScript" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#TypeScript</a> <a href="https://mastodon.thi.ng/tags/JavaScript" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#JavaScript</a>

Karsten SchmidtFrom my old Vimeo archive (2008): <a href="https://mastodon.thi.ng/tags/OpticalFlow" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#OpticalFlow</a> <a href="https://mastodon.thi.ng/tags/3D" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#3D</a> <a href="https://mastodon.thi.ng/tags/InteractionDesign" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#InteractionDesign</a> prototype for Nokia retail stores. No OpenCV, just vanilla pixel buffer analysis (in Java):"Documenting progress for a current project, using optical flow analysis to enable a gestural interface & navigate on-screen content both 2D and 3D.The video analysis requires only a very small (here 160 x 120) capture size and is fairly tolerant to noise. Each frame is recursively analysed in blocks of 30x30 pixels (variable) which are displaced by a certain amount (also adaptable) and then checked for matches in the previous frame. The resulting flow field is displayed and summed to compute the average direction and amount of movement. All calculations and updates to the flow field use threshold & low pass filters to reduce jitter."

Ian Stuart<a href="https://mastodon.social/@wonderofscience" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@wonderofscience</a> I’m pretty sure I recognize the “glitches” of <a href="https://mastodon.social/tags/opticalFlow" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#opticalFlow</a> when I see it. Optical flow is an algorithm that can be used to create new frames/images that didn’t previously exist by supposing which way pixels from one image to the next are moving. In the upper left of the graphic in the first few seconds the clouds move the wrong way.

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