Calculating distance with an Axis Camera 206

[PaulDavis1968]

Originally Posted by shuhao

There are numerous algorithms... we are trying opencv with relatively little success.

Anyone else have better experiences with opencv?

I am using the older version because I had big problems with new 2.3.1. I have starting to write the tracking algorithm I have detected the "parallelograms". Now here comes the math.

[commonsense]

With the range finder we received you shouldn't need to use the Axis camera. The real question is has anyone found information for coding the rangefinder?

[apalrd]

Originally Posted by commonsense

With the range finder we received you shouldn't need to use the Axis camera. The real question is has anyone found information for coding the rangefinder?

It's analog. It outputs a voltage read as an analog channel.

Relating to OpenCV, this shouldn't be necessary on the cRio as NI Vision (CVI) is fairly optimized (and already compiled) for VxWorks.

[shuhao]

About opencv...

I personally would like to mount a netbook on the robot

[MotorHead]

If you haven't already, you should read this white paper on vision and the axis camera. It is from National Instruments and is specific to this years competition. The url is https://decibel.ni.com/content/docs/DOC-20173

You may need to register to download. It provides good detail on the algorithm used and possible errors.

[Solauj]

We are using OpenCV to track the vision target this year. I have been fiddling around with color tracking over the summer, so I have a little experience with it. I have been able to track the tape up to 16ft. away. Due to a lack of smoked polycarbonate, I don't have the actual vision target built yet.

Does anyone known how dense the polycarbonate is? All the manual says is "1/2 in. smoked polycarbonate" with no more description.

As far as determining distance, I thought using the target's relative size to the image size would be viable because the target is 2ft. wide.

What problems are you having with OpenCV? I'll try to help. Also you should get a hold of the book Learning OpenCV: Computer Vision with the OpenCV Library (ISBN: 978-0-596-51613-0). It's great for reference and (obviously) learning the basics.

[apalrd]

Originally Posted by Solauj

What problems are you having with OpenCV?

I am not using OpenCV at all, as I am running all of my code on the cRio.

If you are running the vision on the cRio, using NI Vision (CVI) is a much easier way to go, as it is already compiled for VxWorks, all of the supporting code (get image from axis cam) is already written, there is an example to process rectangles, and you can use NI Vision Assistant to automate a bunch of it.