lvetech
Abnormal fluctuations
Hello, I would like to ask you, when I use no people in the background, there will be amplitude fluctuations, what is the situation? This question moved and puzzled me. I would appreciate it if you could answer this question.
A very high regular noise level in SAD data can be caused by a mismatch between the frame rate of the camera (e.g., 60 fps) and the frequency of the incandescent light (the frequency of your electric grid, e.g., 50 Hz). You can try turning the lights off (if you had them on) and see if it changes anything.
Did you figure out the source of the noise, @XingshiXu? Which camera are you using?
Did you figure out the source of the noise, @XingshiXu? Which camera are you using?
I couldn't find the source, and I tried turning off all the possible lighting that might affect the results. I found that even in scenes without people, the SAD data still exhibits significant fluctuations. The camera I’m using is the RealSense 435i. I'm not sure if there’s an error in the code I implemented, but if possible, I would appreciate it if you could share a specific version of the code for reference. Thank you in advance.
Additionally, I found that this method might be completely ineffective in outdoor environments because the light spots are almost invisible. Do you have any solutions for this issue?
Please check the first item in the "Quick Links" section on the main page (https://github.com/lvetech/ALT). You can use the first script mentioned there to capture frames from a D435i RealSense camera. Once captured, you can check for dropped frames, etc., using the second script. Please refer to the instructions for the scripts, which are also linked there, for details. Once the frames are captured, you can compute SAD between them offline, which should be straightforward at that point.
As for outdoor use, the D435if camera might be (slightly) better than the D435i for that purpose. Our primary applications at this point focus on indoor use. Also, "almost invisible" might be sufficient, provided the outdoor illumination doesn't fluctuate too much, too quickly (how much is "too much" and how quickly is "too quickly" depend on your application in the end).