From 847685f1a611f254aa1f20228bee6d72f3da0245 Mon Sep 17 00:00:00 2001
From: Théo de la Hogue
Date: Mon, 22 May 2023 12:32:52 +0200
Subject: Buffering gaze spread to get real time heatmap effect.

---
 src/argaze/utils/demo_gaze_features_run.py | 37 ++++++++++++++++++++++++++++--
 1 file changed, 35 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/argaze/utils/demo_gaze_features_run.py b/src/argaze/utils/demo_gaze_features_run.py
index 6e7e01e..67c7a52 100644
--- a/src/argaze/utils/demo_gaze_features_run.py
+++ b/src/argaze/utils/demo_gaze_features_run.py
@@ -11,6 +11,7 @@ import argparse
 import os
 import time
 import threading
+import queue
 
 from argaze import ArFeatures, GazeFeatures
 from argaze.AreaOfInterest import AOIFeatures
@@ -59,9 +60,13 @@ def main():
 
     screen_frame = AOIFeatures.AOIFrame(aoi_scene_projection['Screen'], window_size)
     gaze_spread_sum = numpy.zeros((aoi_scene_image.shape[0], aoi_scene_image.shape[1]))
+    gaze_spread_buffer = []
+    gaze_spread_buffer_size = 10
     heatmap_matrix = numpy.zeros(aoi_scene_image.shape, dtype=numpy.uint8)
 
     enable_heatmap = False
+    clear_sum_and_buffer = False
+    enable_heatmap_buffer = False
 
     gaze_movement_identifier = {
         'I-DT': DispersionThresholdIdentification.GazeMovementIdentifier(args.deviation_max_threshold, args.duration_min_threshold),
@@ -95,7 +100,9 @@ def main():
 
         nonlocal gaze_position
         nonlocal gaze_spread_sum
+        nonlocal gaze_spread_buffer
         nonlocal heatmap_matrix
+        nonlocal clear_sum_and_buffer
         nonlocal tpm_analysis
         nonlocal raw_cK_analysis
         nonlocal aoi_cK_analysis
@@ -116,7 +123,23 @@ def main():
         # Edit heatmap
         if enable_heatmap:
 
-            gaze_spread_sum += screen_frame.point_spread(gaze_position.value, sigma=0.05)
+            gaze_spread = screen_frame.point_spread(gaze_position.value, sigma=0.05)
+
+            # Clear sum and buffer once
+            if clear_sum_and_buffer:
+                gaze_spread_sum = numpy.zeros((aoi_scene_image.shape[0], aoi_scene_image.shape[1]))
+                gaze_spread_buffer = []
+                clear_sum_and_buffer = False
+
+            # Sum and and fill buffer
+            gaze_spread_sum += gaze_spread
+            gaze_spread_buffer.append(gaze_spread)
+
+            # remove oldest gaze_spread buffer frame
+            if enable_heatmap_buffer and len(gaze_spread_buffer) > gaze_spread_buffer_size:
+
+                gaze_spread_sum -= gaze_spread_buffer.pop(0)
+
             heatmap_gray = (255 * gaze_spread_sum / numpy.max(gaze_spread_sum)).astype(numpy.uint8)
             heatmap_matrix = cv2.applyColorMap(heatmap_gray, cv2.COLORMAP_JET)
 
@@ -200,7 +223,9 @@ def main():
             # Write heatmap help
             on_off = 'on' if enable_heatmap else 'off'
             enable_disable = 'disable' if enable_heatmap else 'enable'
-            cv2.putText(aoi_matrix, f'Heatmap: {on_off} (Press \'h\' key to {enable_disable})', (20, 40), cv2.FONT_HERSHEY_SIMPLEX, 1, (255, 255, 255), 1, cv2.LINE_AA)
+            buffer_on_off = 'on' if enable_heatmap_buffer else 'off'
+            buffer_enable_disable = 'disable' if enable_heatmap_buffer else 'enable'
+            cv2.putText(aoi_matrix, f'Heatmap: {on_off} (Press \'h\' key to {enable_disable}), Buffer: {buffer_on_off} (Press \'b\' key to {buffer_enable_disable})', (20, 40), cv2.FONT_HERSHEY_SIMPLEX, 1, (255, 255, 255), 1, cv2.LINE_AA)
 
             # Draw gaze spread heatmap
             if enable_heatmap:
@@ -326,6 +351,14 @@ def main():
 
                 enable_heatmap = not enable_heatmap
 
+            # Enable heatmap buffer with 'b' key
+            if key_pressed == 98:
+
+                enable_heatmap_buffer = not enable_heatmap_buffer
+
+                if enable_heatmap_buffer:
+                    clear_sum_and_buffer = True
+
             # Enable cK analysis with 'k' key 
             if key_pressed == 107:
 
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