Hello! I have a question about the norm space in gaze datum format. I'm not sure which position is normalized. Please give me some description. Thanks sincerely!

Hello! I am analyzing pupil data from a Pupil Core recording session. I ran a post hoc blink detection analysis that returned a CSV file with the starting and ending timestamps of the blinks. I would now like to extract the frames from eye0.mp4 to observe the blinks. There is an eye_timestamp.npy file to link with the blink timestamps (I suppose), but I don’t know how to link the eye0_timestamps to eye0.mp4 since the camera's sampling rate is much higher. Should I downsample the eye0 video to match the eye0_timestamp sampling rate? Thank you.

Hi. How can I record the audio when using Pupil Capture? I found a button called “audio mode” and switch it to “sound only”, but in the recording folder I don’t see audio files. Could you please help me?

Hello ! Is there a way to export gaze_positions.csv and pupil_positions.csv without going through the pupil player ui, eg via a python script ?

Hi @user-ea64b5 ! Are you loading the eye0_timestamps.npy as shown here ?

will anyone help with a question I have or do I need to make a ticket for it ????

👋 find your I reply at https://discord.com/channels/285728493612957698/285728635267186688/1224834965108293853

Hi, when I define the surface size, what's the unit of the width and height? Is it 'meter' or just a ratio? I don't know if it would affect coordinates mapping process.

Hello. I'm attempting to use LSL LabRecorder to sync audio input with pupil data. Is there any advice for how to read/interpret the LabRecorder output? Alternatively, does anybody have another solution for syncing pupil data with audio?

Hi there! I’m analyzing pupil data from Pupil Core recorded using both the UI and the python API. My current settings for both eyes are (192, 192) resolution and 120 frame rate. At that frame rate, I would expect to get a sample every ~8 milliseconds, so when I calculate the difference between timestamps, whether I’m using the API or the files created by Pupil Capture (for instance, ‘eye0_timestamps.npy’), the results should be roughly 8ms consistently.

Overall, the results seem to be aligned with my expectations, but for some reason every 40 samples or so I get a 12ms difference, and then it goes back to 8ms. Does anyone know the reason for this or has experienced this behavior before? See the chart below. Any help would be greatly appreciated!

I'm very curious why this happens on my pupil cloud?

yes~thank you

Hello, I'm using LSL with the pupil core headset. I have negative pupil diameter (3d) values and I'm not sure why. How can the diameter value be negative? Thanks.

Hi all. Is there currently any guidance or tutorials on calculating normalized fixation duration , normalized to the area of the AOI ?

Also in here https://docs.pupil-labs.com/core/terminology/, what does it mean by 'surface-normalized coordinates'?

Hi. A conceptual question: In the first 4 rows, the fixation position changes a little bit, but they have the same fixation id (6). When I calculate durations, should I add up all the durations? E.g. The duration of fixation 6 is 297+297+297+297, about 1.2 seconds.

Hi,everyone. I want to know how the Pupil Capture calibrates cameras and what algorithm is used. Where can I find the relative information?

Hi @user-b02f36 👋 ! Do you mean how Pupil Core can estimate the intrinsics of the cameras? Have a look at the Camera Intrinsics Estimation Plugin and its code

Hello, I have some questions, I want to know what are the rotation matrix and translation vector between the scene camera (when the camera is looking straight ahead) and the eye camera for pupil-core? Secondly, what are the internal parameters of the eye camera?

Hi, we’re having some persistent issues with the right hand camera popping off the frames. This has been persistent since first use and makes it very hard to adjust the right hand side of the glasses. Do you have any advice on how to secure the camera to the frame to avoid this? 🙂

HI! I'm now using Pupil Capture to achieve gaze data and pupil data of the eye tracking devices built by myself with three cameras. Now I got the intrinsic parameters, extrinsic parameters and distortion of my cameras through MATLAB. I want to know whether these parameters is useful because I want to make the gaze point data from Pupil Capture more accurate. And when should I use them? After getting the whole data or during the recording? Here I give the appearance of my eye tracking devices.

Hi, all. I'm using Pupil Core to record gaze movements during reading on the screen, which is similar to "web browsing" cuz participants may scroll up and down during reading. I found this article Map Gaze Onto Dynamic Screen Content but this is for Neon and Pupil Invisible. Is there any way to achieve similar things with Pupil Core? Thanks!

Hello, I am using the dual-moncular plugin to get the gaze positions of the two eyes separately. We need to do that because we plan to record eye movements of patients with strabismus and amblyopia who may show different oculomotor performance in the two eyes.

If the gaze_point3d_z is computed as the intersection of the gaze positions of the two eyes using the binocular gaze mapper, I don't understand how this variable is computed using the monocular plugin and how we can have different gaze_point3d_z for the two eyes. Can anyone help with this?

Thanks in advance!

Check out the theta and phi variables.

Thank you. Then, would we lose the ability to "link" the degrees of visual angle (theta and phi) in the pupil_positions file to objects in the scene? We are using apriltags to define surfaces in the scene in case they are useful.

Hello, is there any way to map gaze onto a template image manually via point-and-click (e.g., a plugin for Pupil Player, or any other data analysis tools)? Also, would there be any way to draw AOIs manually? Thank you in advance.

Alternatively, if the Core data were saved directly to an offline computer, would there be any possible way to upload those data to the Pupil Cloud software for analysis?

Alternatively, you can use the Surface Tracker plugin. That enables AOI analysis.

Hi Pupil team, I have a question regarding the start_timestamp in the fixation file. I want to calculate the time differences between each fixations and I wonder in what unit is the pupil time counting forward? Can I just used the start time of one fixation to minus the previous fixation start time to directly get the time differences? Than you!

Hello Pupil Team, I've got a recording which I exported to the pupil player from the pupil cloud to do some offset correction in a video. That worked fine, but now I'm trying to import the video from the player back into the cloud (to use the enrichment function) is there a way to do so? If not is it possible to generate a heatmap in the pupil player? And I have a second question: Is there any way to use specific sections from a video in a heatmap or is there a way to cut the video? Looking forward to your answer 🙂

Hey Pupil Labs Team! How to do the exporting of current date/time data from pupil Core?

@user-d407c1 Thank you so much!

Hey! Is it possible to use glasses while using the Core? If its possible, how much worse would the accuracy be for the gaze position?

Hi, I am using Neon eye tracker, today when i finished recording the video, i clicked on it, a message:" no scene video, this recording contains no scene video". Please what is the solution for this issue?

Hi, I have a problem getting the heatmap on my reference image. At the side under tools I can only edit Area of Interest but there is no option for the heatmap like it is shown in the example video provided by you. Can you help me?

Hi @user-861e5b 👋 ! It sounds like you are using Pupil Cloud , which is not compatible with Pupil Core. Which eye tracker do you have 👓 neon ? 🕶 invisible ? Could we move the conversation to the right channel? That said, in the Project view if you go to Visualisations on the left side and create new visualisation, you should be able to create a heatmap.

Hi everyone, I was wondering if anyone would have any recommendations on how to convert from 'pupil time' to 'system time' on a large scale? I'm working on a project that has loads of data that needs the time to be converted. Thank you in advance!

Hi. I'm using this repo for preprocessing. But here's a bug:

Traceback (most recent call last):
  File "/home/willow/Project/202401-low-vision/codes/bdd-driveratt/test.py", line 1, in <module>
    from eye_tracking.preprocessing.functions.et_preprocess import preprocess_et
  File "/home/willow/Project/202401-low-vision/codes/bdd-driveratt/eye_tracking/preprocessing/functions/et_preprocess.py", line 14, in <module>
    from .detect_events import make_blinks, make_saccades, make_fixations
  File "/home/willow/Project/202401-low-vision/codes/bdd-driveratt/eye_tracking/preprocessing/functions/detect_events.py", line 6, in <module>
    from . import detect_fixations
  File "/home/willow/Project/202401-low-vision/codes/bdd-driveratt/eye_tracking/preprocessing/functions/detect_fixations.py", line 4, in <module>
    from eye_tracking.lib.pupil.pupil_src.shared_modules import fixation_detector
  File "/home/willow/Project/202401-low-vision/codes/bdd-driveratt/eye_tracking/lib/pupil/pupil_src/shared_modules/fixation_detector.py", line 46, in <module>
    import background_helper as bh
ModuleNotFoundError: No module named 'background_helper'

Although this bug can be fixed this way: from . import background_helper, since many scripts are calling each other under the shared_modules folder, it is laborious to modify every importing line in the codes. Is there another way to fix this?

Is Core the only open source product that pupil labs have?

Hello, I am using Pupil Labs (core) and I am currently trying to set up an experiment where I will present multiple visual stimuli. The whole experiment is written in Presentation by NBS, and I am using the Presentation Python interface to run it in python so I can incorporate the time synchronization, start recording, and stop recording codes. My question is if there is any other way to send a ''start recording'' and ''stop recording''messages (apart from using the Python code provided). Is is possible to sent a start and stop recording messages to the eye tracking through a QR code or something similar that I can Include in my visual stimuli that will be presented?

Thank you in advance.

Hello Rob and thanks for your reply.

I will try to be as explanatory as able as I am relatively new to the domain.

The reason I am searching for an alternative is because my whole experiment is written in Presentation by Neurobehavioural Systems and not in Python. However, I needed to use Python to incorporate the start and stop recording parts for the use of Eye tracker

Therefore, I used the Presentation Python Interface (PresPy) which lets me run my experiment in python (see below):

With the code above I could incorporate the use of the eye tracking (include the start/stop recording in the code) in my experiment. However with the use of PresPy I do not have access to the experiment's trials\stimuli, and thus I cannot send annotations before each trial.

The problems that arise are the following: 1) I will not be able to know the number of each trial displayed (there will be 30 trials in every block) 2) I will not be able to determine the area of interest (AOI) where the participant's initial fixation occurs for each trial (Each trial will feature two ROIs displayed on the screen).

Hopefully, I was explanatory enough on why the above problems exist.

Hi, I've read this message about fixations on a surface, but still have one problem: I want to get a list of fixations with their time and positions (x, y, t_start, t_end). How should I convert the fixation on surface data? Currently I treat the points with the same id as the same fixation, and use the average coordinates as the position. Is it a proper way? https://discord.com/channels/285728493612957698/285728493612957698/1186984396805390347

Hi @user-412dbc , my apologies, I thought you were using a Python interface from within Presentation to send messages to Pupil Capture. I see now.

Does your lab potentially use the Lab Streaming Layer or would they be open to using it? It is a robust way to synchronize multiple data streams from different systems. I see that Presentation also offers an LSL integration, with events included in the stream. You could run a test with it and our LSL relay to see if all works, as that would cut out a number of messy details and workload.

If that is not an option, my colleague, @user-cdcab0 , has also pointed out to me that Presentation offers a Network Interface. You could use this to communicate between Presentation and Python, similar to how you use our Network API to communicate between Python and Pupil Capture. Your Python script would then become something of a central routing point between Presentation and Pupil Capture.

Hello, I wanted to know if there is any way to use pupil core wirelessly? Any 3rd party adapters work?

Hello, I am using Core and Pupil Mobile in an experiment. In the previous experiment, the post-hoc calibration works perfectly as the eye gaze landed on the calibration mark. But today, something happened that the eye gaze deviates so far from the calibration mark. We tried setting the world camera and the eye camera, but this didn't work. When we do the test in Pupil Capture (PC), it works like a charm. What did go wrong in the experiment?

Picture attached. As you can see, both eyes are visible in the eye camera and it has good confidence levels. Thank you!

Hello everyone. I have started pre-testing my experiment which uses Pupil Invisible (protocol is : participants stare at a white wall while recalling personal memories). When looking at the data, even if the majority of the time, the cercle around the eye is dark blue, suggesting good detection, I have very, very small pupil diameter data (around 1 mm, which seems physiologically impossible). Do you know where the problem could come from please ? I am really puzzled by this. Thanks in advance for your help.