VaxCounting: Counting and Measuring Vehicles Speed

This example video intends to demonstrate one of the very many functions that VaxTracking can perform: velocity measurement and counting. In this case we placed a very basic camera, one that can be bought in any electronics store, over a dual carriageway with many passing vehicles. The objective was to measure the speed at which cars and other vehicles were passing us. This was done in real time, and as you can see from the footage of multiple vehicles simultaneously. Such speed measurements are also possible when shooting from an static camera in a moving vehicle. This is one of the many video analytics examples that demonstrates how behavioral information derived from video, can be used to take traffic safety improvement measures. More at www.vaxtor.com

Category:

Science & Technology

Tags:

• vehicles counter
• measure vehicles speed
• measure vehicles velocity
• measure car speed
• medir velocidades vehiculos

[Neochange86]

Thanks, It's so interesting, but I think It is so difficult to earn money with that. You need calibrate every camera separately and road conditions (inclination, etc) are too important.

Regards

[vaxtorsystems]

Hi, we have external calibration process using a vehicle driving under controlled speed via GPS. The internal calibration process is our camera self-calibration software which quite sophisticated. We use the same software in 3D reconstruction from video (see vaxtor.com) to model the camera motion in a 3D environment... so the whole calibration process takes about 1 hour, less time than mounting the camera on top of the post. The software does not work well on hard inclination and curves

[sticky170]

Not realy accurate is it?

[vaxtorsystems]

Hello... well it depends on the calibration process and camera reliability... for a "not bad" 700 USD camera we get 90% accuracy with no problem... during the day. For high speed shutter camera we can stay above 90% most of the time

[necromncr]

Look on the right size - the blue sign! It's the.. the..!!

[vaxtorsystems]

jejeje, the blue sign means you can make a "U" turn next exit in the highway :)

[vaxtorsystems]

Hello, the speed calculation is based on a function (analytic) extracted from the motion forecast and other parameters we get from out self-calibration software we developed for cameras. We also need a first vehicle driving at different (known) speeds for additional calibration purposes. In this case, the speed equation v = s/t assuming 's' as a distance based on pixel size, does not work, I can tell you that for sure.

[Neochange86]

Hello, this demo is great, but how do you calculate depth without stereoscopic cameras? It's just curiosity, I am thinking about a pixel represents a different lenght at the bottom and at the top of the image.

Thanks

[vaxtorsystems]

Hi... not just blobs anaylsis... we use SURF to detect local features in the images, shadow removal technics and Kalman filters to forecast motion and calculate the speed more accurately. Hence, the software works fine under dense traffic scenarios but it may show up lack of accuracy under heavy traffic jams counting from low angle camera.

[Shaunakde]

What happens in heavy traffic? Does it still recognize the vehicles if two blobs overlap?