The Eye Tribe

Re: smoothed gaze coordinates in pix

2014-12-18T13:15:36+02:00

You have the average for each eye inside the left/right JSON object. Will check the C++ SDK.

Code:: "frame": { "timestamp": "2014-12-18 11:58:53.730" "state": 7, "fix": false, "time": 487384226, "raw": {"x": 584.057,"y": 440.2673 }, "avg": {"x": 584.057,"y": 440.2673 }, "lefteye": { "avg": { "x": 583.9083, "y": 458.1152}, "pcenter": { "x": 0.3541, "y": 0.532}, "psize": 22.211, "raw": {"x": 583.9083, "y": 458.1152} }, "righteye": { "avg": { "x": 584.2057, "y": 422.4195}, "pcenter": { "x": 0.5084, "y": 0.504}, "psize": 22.7543,"raw": { "x": 584.2057, "y": 422.4195} }, }

Statistics: Posted by skataMartin — 18 Dec 2014, 13:15

Re: smoothed gaze coordinates in pix

2014-12-18T04:57:24+02:00

A small discrepancy has come to my attention regarding smoothed versus raw gaze data:

if averaging you have two variables:
gazedata_avg.x
gazedata_avg.y

But with raw data:

gazedata.lefteye.raw.x
gazedata.lefteye.raw.y
gazedata.rifghteye.raw.x
gazedata.rifghteye.raw.y

So, when averaging, we can not distinguished between left and right eye data. It might be useful to update the SDK to give us:
gazedata.lefteye.avg.x
gazedata.lefteye.avg.y
gazedata.rifghteye.avg.x
gazedata.rifghteye.avg.y

This would be useful for application that need to use just one eye.

Statistics: Posted by skataryklin — 18 Dec 2014, 04:57

Re: smoothed gaze coordinates in pix

2014-03-05T18:04:29+02:00

Turns out there is a small typo in the C++ client parsing.

Row 125 in gazeapi_parser.cpp should be:

Code:: parse_point2d(gaze_data.avg, frame->get_child("avg"));

Github repository to be updated with changes soon.

Statistics: Posted by skataMartin — 05 Mar 2014, 18:04

Re: smoothed gaze coordinates in pix

2014-03-05T17:36:23+02:00

We're looking into this right now. Will get back to you once we've located the bug and have a solution. Won't take long.

Statistics: Posted by skataMartin — 05 Mar 2014, 17:36

Re: smoothed gaze coordinates in pix

2014-03-05T15:07:35+02:00

The same for me.

In debugger (MSVS 10) I have the gaze_data.avg values constantly the same (-1.0737418e+008), while the other members of gaze_data are changing.

Statistics: Posted by skataMastaLomaster — 05 Mar 2014, 15:07

smoothed gaze coordinates in pix

2014-02-26T21:23:42+02:00

I have run this code (provided in the website) and captured the gaze data.

I encounter a problem.

Code:: gtl::Point2D const & smoothedCoordinates = gaze_data.avg;

return values of x and y coordinates always are -107374176.

Others lefteye, righteye, raw, etc are normal.

How to handle?

The smoothed gaze coordinate value is calculated from center value between lefteye.avg and righteye.avg?
gaze_data.avg=(lefteye.avg+righteye.avg)/2??

Thank you.

Statistics: Posted by skatamingxinbit@gmail.com — 26 Feb 2014, 21:23