Add motion detection before object detection

config.env.example

@@ -110,6 +110,13 @@ EXPORT_CSV=true
 CROSS_CSV=/opt/batch-counter/batch_crossings.csv
 
 # --- Rate / performance ---
+# Enable motion detection pre-filter: skip inference on frames with no movement
+# (true/false, default: false). When enabled, frames below MOTION_THRESHOLD are
+# skipped, saving NPU/CPU load.
+MOTION_DETECTION_ENABLED=false
+# Mean absolute pixel difference threshold (0–255) to consider a frame as having
+# motion. Lower = more sensitive. Default 5.0.
+MOTION_THRESHOLD=5.0
 # Sliding window in seconds for computing the crossing rate (objects/minute)
 RATE_WINDOW_SEC=60
 # Number of frames to discard at startup to let the stream buffer stabilise