wiki:radar_app
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wiki:radar_app [2023/05/08 12:01] vizycam |
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| - | One thing you'll probably notice is that the video window is dark. This is to prevent pictures with motion blur. (Normally, the Radar application is taking footage from daytime/outside lighting conditions.) To fix this, bring up the settings dialog by clicking on the **Settings** button, and enable **Low light**, which will allow you to better test indoors. | + | One thing you'll probably notice is that the video window is dark. This is to prevent motion blur in the images. That is, normally the Radar application is taking footage from daytime/outside lighting conditions and the vehicles are typically moving fast across the image. To fix the dark image, bring up the settings dialog by clicking on the **Settings** button, and enable **Low light**, which will allow you to better test indoors. |
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| ==== Calibration ==== | ==== Calibration ==== | ||
| - | The Radar application measures the distance a vehicle travels between each frame and then fits a straight line across all measurements. This method is quite accurate, but it needs to be calibrated to accurately associate the pixels in the image with actual distances so it can estimate the speed of the vehicle (either kph or mph). This can be done by either driving in front of Vizy at a known speed, or by estimating the speed of a given vehicle. Because of camera geometry, lanes closer to Vizy's lens will have faster apparent motion than lanes further away from Vizy's lens. For this reason, it's best to calibrate the speed of vehicles moving in both directions to achieve the most accurate speed measurements. (Currently, the Radar application assumes there are only two lanes, one for each direction of travel.) | + | The Radar application measures the distance a vehicle travels between each frame and then fits a straight line across all measurements. This method is quite accurate, but it needs to be calibrated to accurately associate the pixels in the image with actual distances so it can estimate the speed of the vehicle in either kph or mph. This can be done by either driving your vehicle in front of Vizy at a known speed, or by estimating the speed of a given vehicle. Because of camera geometry, lanes closer to Vizy's lens will have faster apparent motion than lanes further away. For this reason, it's best to calibrate the speed of vehicles moving in both directions to achieve the most accurate speed measurements. (Currently, the Radar application assumes there are only two lanes, one for each direction of travel.) |
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| To calibrate, just click on the image that contains the vehicle that you know the speed of. Then click anywhere within the image to bring up the calibration dialog. | To calibrate, just click on the image that contains the vehicle that you know the speed of. Then click anywhere within the image to bring up the calibration dialog. | ||
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| * **Speed limit**: This adjusts the speed limit. Vehicles that exceed this speed are "speeders". | * **Speed limit**: This adjusts the speed limit. Vehicles that exceed this speed are "speeders". | ||
| - | * **Sensitivity**: Lowering the sensitivity will reduce any false positive vehicle detections and increasing the sensitivity will reduce the false negative vehicle detections (not detecting vehicles that are there). | + | * **Sensitivity**: Lowering the sensitivity will reduce any false positive vehicle detections and increasing the sensitivity will reduce the false negative vehicle detections (not detecting vehicles that are present). |
| * **Kilometers per hour**: Check this if you prefer kilometers per hour to miles per hour. | * **Kilometers per hour**: Check this if you prefer kilometers per hour to miles per hour. | ||
| * **Camera pointing left**: Check this if Vizy is pointing to the left. Leave it unchecked if Vizy is pointing to the right. This helps Vizy determine when to take a picture such that it will get the best possible view of the license plate. | * **Camera pointing left**: Check this if Vizy is pointing to the left. Leave it unchecked if Vizy is pointing to the right. This helps Vizy determine when to take a picture such that it will get the best possible view of the license plate. | ||
wiki/radar_app.txt ยท Last modified: 2023/05/09 07:40 by vizycam
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