Capture stills with Raspberry pi?

Marble68

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I am just getting into LPR projects - and I have a 2MP LPR camera hot off the boat from China. ha
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It provides an RTSP stream - and I setup FFMPEG to grab frames and write them to a ram drive.

It seems to work ok - but as cars go past it sometimes "ghosts" them, or misses them entirely.

My goal for this project is to put the camera on axis, and using a radar module, take a photo of every vehicle coming down the road.

I figured I'd probably use openALPR for post image processing - but is that the way to go? There's also OpenCV for real time object detection and tracking - is that what other people use?

Would I do better to consume the video stream and process it live and save out pictures that are clear?

My current solution has FFMPEG writing frames out to a ram drive - then another job cleaning up old images - and finally, another job that copies the images based on radar input.

At the end of the day - my goal is a clean picture of every vehicle that passes my camera with human readable license plate - and hopefully clear enough for something like openALPR to process with reasonable accuracy.

I'm running the camera at 1280x1080 30fps - but the PI is only grabbing about 5 to 7 fps (with ffmpeg).
 

carbonita

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I have a raspberry pi zero which captures stills when confidence number is high for faces. It can do (maybe) one still every 3 seconds. I used the Google AIY kit for the parts, and modded code for face stills and email. Separately, google vision service has a demo, where one can upload images to assess. I figure google is at least competitive with OCR.
 
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Marble68

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I have my camera set to maximum frame rate, etc. - I was reading on an openALPR thread about dropping the frame rate to match the platform processing it.

Has anyone else had luck with this approach?

I was thinking an openALPR license would be a good idea - but they want a $1000!!!!!! That's insane.
 

Marble68

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I have a raspberry pi zero which captures stills when confidence number is high for faces. It can do (maybe) one still every 3 seconds. I used the Google AIY kit for the parts, and modded code for face stills and email. Separately, google vision service has a demo, where one can upload images to assess. I figure if google is at least competitive with OCR.
Those look cool - I'll have to play with one! Thanks!
 
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