From d0c462824c7e3251df4f8aedc3493b7d48bbd3c7 Mon Sep 17 00:00:00 2001
From: Théo de la Hogue
Date: Wed, 7 Sep 2022 11:37:13 +0200
Subject: Exporting files into a folder named according time range setting.
 Processing gaze accuracy for further movements analysis.

---
 src/argaze/utils/export_tobii_segment_movements.py | 49 +++++++++++++++++++---
 1 file changed, 43 insertions(+), 6 deletions(-)

(limited to 'src')

diff --git a/src/argaze/utils/export_tobii_segment_movements.py b/src/argaze/utils/export_tobii_segment_movements.py
index ee41a60..ece8cff 100644
--- a/src/argaze/utils/export_tobii_segment_movements.py
+++ b/src/argaze/utils/export_tobii_segment_movements.py
@@ -8,6 +8,7 @@ from argaze.TobiiGlassesPro2 import TobiiEntities, TobiiVideo
 from argaze.utils import MiscFeatures
 
 import cv2 as cv
+import numpy
 
 def main():
     """
@@ -41,6 +42,16 @@ def main():
 
                 destination_path = args.segment_path
 
+                # Export into a dedicated time range folder
+                timerange_path = f'[{int(args.time_range[0])}s - {int(args.time_range[1])}s]'
+
+                destination_path = f'{destination_path}/{timerange_path}'
+
+                if not os.path.exists(destination_path):
+
+                    os.makedirs(destination_path)
+                    print(f'{destination_path} folder created')
+
         fixations_filepath = f'{destination_path}/movements_fixations.csv'
         saccades_filepath = f'{destination_path}/movements_saccades.csv'
 
@@ -68,8 +79,30 @@ def main():
         ts_gaze_positions = GazeFeatures.TimeStampedGazePositions()
 
         for ts, tobii_gaze_position in tobii_ts_gaze_positions.items():
-            video_gaze_pixel = (int(tobii_gaze_position.value[0] * tobii_segment_video.get_width()), int(tobii_gaze_position.value[1] * tobii_segment_video.get_height()))
-            ts_gaze_positions[ts/1000] = video_gaze_pixel
+            gaze_position_pixel = (int(tobii_gaze_position.value[0] * tobii_segment_video.get_width()), int(tobii_gaze_position.value[1] * tobii_segment_video.get_height()))
+            ts_gaze_positions[ts/1000] = gaze_position_pixel
+
+        # Access to timestamped gaze 3D positions data buffer
+        tobii_ts_gaze_positions_3d = tobii_segment_data['GazePosition3D']
+
+        # Format gaze accuracies in pixel and store them using millisecond unit timestamp
+        ts_gaze_accuracies = GazeFeatures.TimeStampedGazeAccuracies()
+
+        # !!! the parameters below are specific to the TobiiGlassesPro2 !!!
+        # Reference : https://www.biorxiv.org/content/10.1101/299925v1
+        tobii_accuracy = 1.42 # degree
+        tobii_precision = 0.34 # degree
+        tobii_camera_hfov = 82 # degree
+
+        for ts, tobii_ts_gaze_position_3d in tobii_ts_gaze_positions_3d.items():
+
+            if tobii_ts_gaze_position_3d.value[2] > 0:
+
+                gaze_accuracy_mm = numpy.sin(numpy.deg2rad(tobii_accuracy)) * tobii_ts_gaze_position_3d.value[2]
+                tobii_camera_hfov_mm = numpy.sin(numpy.deg2rad(tobii_camera_hfov)) * tobii_ts_gaze_position_3d.value[2]
+                gaze_accuracy_pixel = round(tobii_segment_video.get_width() * float(gaze_accuracy_mm) / float(tobii_camera_hfov_mm))
+
+                ts_gaze_accuracies[ts/1000] = gaze_accuracy_pixel
 
         print(f'Dispersion threshold: {args.dispersion_threshold}')
         print(f'Duration threshold: {args.duration_threshold}')
@@ -175,15 +208,19 @@ def main():
 
                         current_fixation_time_counter += 1
 
-                    cv.circle(video_frame.matrix, current_fixation.centroid, current_fixation.dispersion + current_fixation_time_counter, (0, 255, 255), 1)
+                    cv.circle(video_frame.matrix, current_fixation.centroid, current_fixation.dispersion + current_fixation_time_counter, (0, 255, 0), 1)
 
                 try:
 
                     # Get closest gaze position before video timestamp and remove all gaze positions before
-                    closest_gaze_ts, closest_gaze_position = ts_gaze_positions.pop_first_until(video_ts_ms)
+                    _, nearest_gaze_position = ts_gaze_positions.pop_first_until(video_ts_ms)
+
+                    # Get closest gaze accuracy before video timestamp and remove all gaze accuracies before
+                    _, nearest_gaze_accuracy = ts_gaze_accuracies.pop_first_until(video_ts_ms)
 
-                    # Draw gaze position
-                    cv.circle(video_frame.matrix, closest_gaze_position, 10, (0, 255, 255), 2)
+                    # Draw gaze position and precision    
+                    cv.circle(video_frame.matrix, nearest_gaze_position, 2, (0, 255, 255), -1)
+                    cv.circle(video_frame.matrix, nearest_gaze_position, nearest_gaze_accuracy, (0, 255, 255), 1)
 
                 # Wait for gaze position
                 except ValueError:
-- 
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