From 549eb7922b2543ef650c1eabacefe965b46d2ed0 Mon Sep 17 00:00:00 2001
From: Aditya Gupta <mail@adityagupta.dev>
Date: Sun, 1 Feb 2026 15:27:12 +0530
Subject: [PATCH] Added vflip

---
 desk_presence.py | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/desk_presence.py b/desk_presence.py
index 2140de4..cbd3306 100755
--- a/desk_presence.py
+++ b/desk_presence.py
@@ -8,6 +8,7 @@ import time
 import requests
 import logging
 import sys
+import argparse
 
 # ==================================================
 # Logging
@@ -27,6 +28,21 @@ logging.basicConfig(
 
 log = logging.getLogger("desk_presence")
 
+# ==================================================
+# Arguments
+# ==================================================
+parser = argparse.ArgumentParser(description="Desk presence detection")
+parser.add_argument(
+    "--vflip",
+    action="store_true",
+    help="Flip captured image vertically before processing",
+)
+args = parser.parse_args()
+VFLIP = args.vflip
+
+if VFLIP:
+    log.info("Vertical flip enabled")
+
 # ==================================================
 # Camera
 # ==================================================
@@ -231,8 +247,8 @@ def detect_motion(gray):
     diff = cv2.absdiff(prev, gray)
     mean_diff = np.mean(diff)
 
-    if mean_diff > 18:
-        log.debug("Ignoring global brightness change (mean=%0.2f)", mean_diff)
+    if mean_diff > 75:
+        log.debug("Ignoring global brightness change (mean=%.2f)", mean_diff)
         return False
 
     _, thresh = cv2.threshold(diff, 30, 255, cv2.THRESH_BINARY)
@@ -267,6 +283,9 @@ def main_loop():
                 time.sleep(30)
                 continue
 
+            if VFLIP:
+                frame = cv2.flip(frame, 0)
+
             gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
 
             face = detect_face(gray)