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Qingwen Liu
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General question about accumulative optical flow
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Currently I am facing how to relate the change of accumulative optical flow values to the velocity of moving object. Geof told me before that if I are sampling every 0.1 seconds, the accumulated…Continue

Started this discussion. Last reply by Geoffrey L. Barrows Feb 11, 2011.

 

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Geoffrey L. Barrows replied to Qingwen Liu's discussion General question about accumulative optical flow
"Hi Qingwen, When going into method 2, try also enabling the calibration mask, by sending command [62,1]. It could be you don't have the calibration mask enabled, and so the fixed pattern noise washes out the image you are picking up. Geof"
Feb 11, 2011
Randy Mackay replied to Qingwen Liu's discussion General question about accumulative optical flow
"A couple of random ideas from me ..    - how about filtering the results?  i.e. instead of working off the raw values coming out of the camera, how about each time you take the rolling average of the past 3 values?  all the…"
Feb 10, 2011
Qingwen Liu replied to Qingwen Liu's discussion General question about accumulative optical flow
"Geof,   Currently I am trying to put the sensor on a robot, and set a constant velocity to that machine and collect data from the sensor.   I use the command 60, 2 so as to test the method 2: odemetry with displacement based update. I…"
Feb 9, 2011
Qingwen Liu posted a discussion

General question about accumulative optical flow

Currently I am facing how to relate the change of accumulative optical flow values to the velocity of moving object. Geof told me before that if I are sampling every 0.1 seconds, the accumulated optical flow is the sum of about 40 individual optical flow measurements. How can we get the number "40"? I tried to find frame/sec used by the sensor, so I used the command 2, 60. The results are as follow:1-------2321-------232   …See More
Jan 22, 2011
Qingwen Liu is now a member of Embedded Eye
Jan 4, 2011

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