btsimonh's node-opencv motion detection (2017-11-02)
This flow shows use of node-opencv (from https://github.com/peterbraden/node-opencv) used for motion detection on RPi3 at 5fps at 640x480. At 5fps, it uses about 25% of the RPi. Ensure you install from gihub - npm install peterbraden/node-opencv from ~/.node-red
You will need to install opencv 3.3.0 (see https://btsimonh.wordpress.com/node-opencv-with-node-red/).
You will need https://flows.nodered.org/node/node-red-contrib-multipart-stream-encoder
You will need 'require' in globals.
Notes:
Press start to start the flow.
Press stop to stop the flow. make sure you stop before re-deploying, else you may find you can't restart (unable to open video).
Point a browser at /test2 for a mjpeg stream of the input video with boxes drawn for motion detected.
Point a browser at /mvmt for a mjpeg stream of the output of the opencv background extractor.
FPS, Motion detection frame size is set using 'width' in 'Variables'. It will work at higher framerates with smaller image sizes, and because some of the processing is Async, you can occupy more than one core of the RPi. Images should be re-ordered to correct order at output.
Updated to allow global or NR local node-opencv install.
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currentframe)\n //node.warn(\"framediff \"+framediff);\n\n if (framediff > 5){\n framestore = {};\n currentframe = msg.framenumber;\n node.warn(\"**** reset framediff2 \"+framediff + \" len \"+Object.keys(framestore).length);\n } else {\n if (framediff > 1){\n node.warn(\"framediff2 \"+framediff + \" len \"+Object.keys(framestore).length);\n }\n }\n\n framestore['frame'+msg.framenumber] = msg;\n flow.set('framestore2', framestore);\n}\n\n\nvar moreframes = 3;\nvar framessent = 0;\ndo {\n if (framestore['frame'+currentframe] != undefined){\n var newmsg = framestore['frame'+currentframe];\n delete framestore['frame'+currentframe];\n currentframe++;\n flow.set('currentframe2', currentframe);\n //node.warn();\n var timetosend = (newmsg.time_in + 500) - (new Date());\n if (timetosend < 0)\n timetosend = 0;\n \n setTimeout(function(){node.send(newmsg);}, timetosend);\n \n framessent++;\n moreframes --;\n } else {\n moreframes = 0;\n }\n} while (moreframes);\n\nif (framessent > 2){\n node.warn(\"frames2 sent \"+framessent);\n}","outputs":1,"noerr":0,"x":860,"y":480,"wires":[["cfd82a72.82b288"]]},{"id":"85a18620.7d76d8","type":"ui_group","z":"","name":"Default","tab":"82abaa61.322da8","disp":true,"width":"6"},{"id":"96dbe569.b5e008","type":"ui_group","z":"","name":"avgs","tab":"82abaa61.322da8","disp":true,"width":"6"},{"id":"82abaa61.322da8","type":"ui_tab","z":"","name":"newstuff","icon":"dashboard"}]
