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how to increase the resolution of logitech c920 to detect aruco markers more stably

asked 2017-11-07 14:59:41 -0500

eric_cartman gravatar image

updated 2017-11-07 15:47:13 -0500

I am using logitech c920(about 12ft above ground) to detect an aruco marker using the aruco_ros library. The resolution is set to 640x480 but at this resolution the aruco marker is not being detected if anything slightly comes in front of the marker. I wanted to see if i increase the resolution to 720p the aruco marker detection becomes more stable.

I tried to change it in the (edit:usb_cam-stream)launch file but that did not help. It gives this error - "No jpeg data found in image. Error while decoding frame."

I tried to change the pixel format to yuyv from mjpeg but it was giving some other error. "VIDIOC_DQBUF error 19, No such device"

I also tried to change the resolution using v4l2-ctl but there wasn't an option to change it.

Anyone know of a different way to increase the resolution or know of a different aruco library that does more stable detection? Also is there a camera that does aruco detection better that is not too expensive? The goal is to detect the markers well about 10-15ft away and also not completely lose the marker when there is a small obstacle(eg: 3in diameter ball).

Thanks in advance

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answered 2018-04-11 19:10:19 -0500

lucasw gravatar image

A resolution and image format that works in an application like guvcview probably also works in usb_cam (maybe not all pixel types)- it is very quick and easy to experiment there then bring the changes to the parameters to usb_cam.

Also v4l2-ctl will list valid resolution and format combinations:

v4l2-ctl --device=0 --list-formats-ext
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Asked: 2017-11-07 14:59:41 -0500

Seen: 690 times

Last updated: Apr 11 '18