Use random example
ClosePass.app
This tools is made to help you prepare an evidence to report a close pass. It uses simple geometry to draw ruler lines in perspective. Watch the video for instructions.
Consider the image below. It was taken with a normal phone camera from middle distance. What you can quickly notice is that while the widths are distributed evenly, they don't match the real-life distances.
For that reason we have to calibrate our cameras to reflect the distortion factor. Usually it can be done, by ensuring that at least two known widths match the real-life distances. The Math behind it is simple: linear interpolation.
If your camera is too close to the subject you may encounter the fish-eye effect. While the distances shown on the example below are close to true, the visible distortion on horizontal line may put your footage in the question.
One useful way how the tool will show that the lines used on the measurement aren' correct is by showing the top blue dots not matching. If you see that, you should look for other frame or better distances of reference.
The possible distortion is quite common with 360 cameras. consider the example below:
For those cameras you want to zoom in as much as possible to avoid the distortion. What you will notice anyhow will be depth distortion, which we will address in the future versions.
If the editor freezes or the handles disappear, try to refresh the site. That's it. There is nothing stored on servers etc. Photo is loaded to your browser only.
You can use this site without cookies and registration. Just select the photo and start drawing. It won't be uploaded anywhere yet. You can take a screenshot and you're done. Or you can use download feature. If you do that you'll have to register to our newsletters and copy of the photo will be saved to our servers for research and AI models development to improve our features.
We will work on improving the accuracy and adding tutorials. If you have any ideas about what features can be useful to you drop us an email on contact at phonekills.com. If you want to use this tool in your traffic department, but you're afraid about the GDPR or the data residency - contact us. We can bundle you the tool as a standalone desktop application.
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