Hello, I have question about a weird gaze offset compared to what I am looking at and what the pupil core DIY thinks I am looking at.

For example, in this picture I am looking at the cursor here but the gaze dot is always a bit offset, this was a problem throughout the session. I'm not sure exactly what the problem is, (world camera focusing, how far I should be looking at the screen, etc,) but I would like some general pointers on what I should do, to debug this.

Hello, Is it possible to get saccade information in core ? If yes how to set it up.

[email removed] , is this happening for all

Hi everyone, I’m analyzing Pupil Core recordings offline and need guidance on two points: 1. Time to First Fixation (TTFF) — What’s the recommended way to compute TTFF on a surface/AOI using Pupil exports? 2. Aggregated heatmap across participants — Best practice to generate a grand heatmap on a static stimulus?

@user-f43a29 Thanks, Rob! 🙏 Yes — I want to compute TTFF with respect to the start of the stimulus presentation, not the recording start.

I didn’t use the Annotations during recording, but I designed the task in PsychoPy, so I have the exact stimulus onset timestamps for each trial.

Hi everyone, I defined a Surface manually in one recording, and I’d like to use exactly the same surface coordinates and size in all my other recordings (same monitor setup, same AprilTags). What should I do?

Hi @user-74b1c6 , please try my colleague's, @user-4c21e5 , tip here and let us know how it goes: https://discord.com/channels/285728493612957698/285728493612957698/1305841351916523561

Hello, for the Pupil Core eye cameras, are there any "ideal" settings that should be used or any best practices on what settings to change if certain things happen (E.g., model not sticking well to the pupil, should you then increase the brightness of the IR lights or if someone is using glasses while using the device?) Thank you.

Hi @user-74b1c6 , you are welcome. Would you be open to sharing the recording with us for closer inspection? If so, you can share it with data@pupil-labs.com via Google Drive, for example.

Hi everyone. I have connected eye tracker with the laptop and using pupil capture. Eye0 and Eye 1 camera is working but I am not able to see world camera view. I unplugged and connected it and did restart it many times but its not working. what should i do?

Hello! We now want to use four eye cameras in pupil capture to obtain pupil positions and shoot videos. Is this possible? I only found demo for capturing video frames in the GitHub repository. Many thanks!

Hi @user-b02f36 , you could write a Pupil Capture plugin for that, or use Annotations to synchronise the different cameras. Lab Streaming Layer would also be an option. See here for more details on some of these options.

I see. Thank you, Rob! btw, is it possible to run pupil capture from source on Windows? I only tried to run it from source on Ubuntu 20.04.

I see. It is possible to run from source using miniconda! Thank you, Neil!

Hello, what operations should be performed for dynamic areas of interest (tracking moving pedestrians)? We have built a scenario in Unity where pedestrians are crossing the road, and participants are required to wear eye-tracking devices to see whether they can notice these pedestrians.

Hi @user-d9be4a , are you using Unity for VR stimuli or are you simply presenting stimuli on a computer monitor?

Hi @user-b02f36 , I am not able to do code reviews or provide detailed support for adding custom DIY cameras to Pupil Core. Upon a quick inspection of the code, I do not immediately see anything erroneous. Perhaps try trimming down the Plugin or progressively commenting out sections until you find the troublesome bit of code.

Also, do you mean you are running Pupil Capture from within a miniconda installation? You may want to rather just use plain Python, installed from the Python Org website, with a fresh virtual environment. Sometimes conda can inadvertently introduce issues.

Otherwise, perhaps members of the community who have tried similar can share their experiences.

Hi @user-d9be4a , did you also use AprilTags with Pupil Core's Surface Tracking capabilities?

Hi there, I'm performing a research data collection using Pupil Core, but some of my participants have prescription glasses. I saw another thread where it was explained that it will be challenging, but I was wondering if there is a way to still process the eye video data offline to get better gaze detection results despite the prescription glasses being there? I could not put the eye cameras under the person's glasses so I kept them on top. Can I use the egocentric video and eye videos to generate the gaze trackig in post-hoc? Thank you in advance!

Hi @user-d9be4a , using AprilTags is correct, but if you only used one tag, then the Surface Tracking plugin will not work correctly or robustly. As an alternative, if you only need to know if gaze was on/off of pedestrians, then you could try an object detection routine, such as those provided with YOLO to detect the pedestrians in Pupil Core's world camera video and then check if the gaze data overlap with the segmentation.

Thanks @user-f43a29, I forgot to mention that I am not making the recordings using Pupul Capture. I am using custom system that integrated PupilLabs.PupilFacade for online gaze detection and the saved data is not in the format that Pupil Player expects it. I also don't have the calibration data being saved. Would it still be possible to do any post-processing of the videos with this type of approach?

Yes. Defining AOIs with Pupil Player requires use of the Surface Tracking plugin, which works best with at least three AprilTags, preferably more.

Hello — my goal is to calculate pupil angular velocity and detect microsaccades using Pupil Core. May I ask following questions:

1. Which columns should I use? Should I use theta and phi from pupil_positions.csv, or compute theta and phi from gaze_positions.csv, or use other fields?

2. Is a sampling rate ≥ 200 Hz required? How do I set that sampling rate? If the actual sampling rate is lower than 200 Hz, is upsampling (interpolation) acceptable?

Thanks for any guidance!

Will a computer with this 13-inch model run properly when using Pupil Core? https://www.microsoft.com/ja-jp/surface/devices/surface-pro#tech-specs-uidee13

Thank you so much Miguel! Should microsaccade events be limited to the time periods in fixations.csv, since in theory they occur only during fixations?