Click Start/Stop button to start or stop the camera capture.
The videoInput is a <video> element used as OpenCV.js input.
The canvasOutput is a <canvas> element used as OpenCv.js output.
The code of <textarea> will be executed when video is started.
You can modify the code to investigate more.
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videoInput (Not uploaded)
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canvasOutput
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reference: https://docs.opencv.org/5.x/dd/d00/tutorial_js_video_display.html
HSV color circle: http://ylb.jp/cguide/_eggx_hsv.html