Update app.py

app.py

@@ -15,7 +15,7 @@ import cv2
 
 NOISE_THRESHOLD  = 0.55
 FREQ_THRESHOLD   = 500
-ELA_THRESHOLD    = 0.25
+ELA_THRESHOLD    = 0.30   # relevé de 0.25 → 0.30 pour attraper les retouches légères
 MIN_SIGNALS      = 2
 
 
@@ -159,12 +159,21 @@ def detect_deepfake(img):
         ai_confidence += 20;  signals_triggered += 1
         reasons.append(f"⚠️ Gradients trop lisses (ratio={gradient_ratio:.2f} < 1.2)")
 
-    # S5 — Retouche locale
-    if silent_ratio > 0.20 and inter_block_var > 0.08:
+    # S5a — Traitement IA global (Nano Banana, Gemini Edit, Remini…)
+    # > 55% zones silencieuses = bruit effacé globalement par un outil IA
+    # Nano Banana écrase le bruit uniformément donc inter_block_var reste faible
+    if silent_ratio > 0.55:
+        ai_confidence += 22;  signals_triggered += 1
+        reasons.append(
+            f"⚠️ Traitement IA global — {silent_ratio*100:.0f}% zones sans bruit "
+            f"(seuil > 55%) — Nano Banana / Gemini Edit / filtre IA detecte"
+        )
+    # S5b — Composite / retouche par zone (fond remplace, objet insere)
+    elif silent_ratio > 0.20 and inter_block_var > 0.08:
         ai_confidence += 30;  signals_triggered += 1
         reasons.append(
-            f"⚠️ Retouche locale — {silent_ratio*100:.0f}% zones sans bruit, "
-            f"variance inter-blocs={inter_block_var:.3f}"
+            f"⚠️ Composite / retouche locale — {silent_ratio*100:.0f}% zones sans bruit, "
+            f"variance inter-blocs={inter_block_var:.3f} — masquage par zone"
         )
 
     # S6 — Skin smoothing
@@ -253,8 +262,8 @@ def process(input_img):
     report += f"  [S1] Bruit capteur corrigé  : {noise_val:.3f}  (seuil < {NOISE_THRESHOLD})\n"
     report += f"  [S2] Pic FFT                : {freq_val:.0f}     (seuil > {FREQ_THRESHOLD})\n"
     report += f"  [S3] ELA moyenne            : {ela_val:.4f}  (seuil < {ELA_THRESHOLD})\n"
-    report += f"  [S5] Zones sans bruit       : {silent_ratio*100:.1f}%   (seuil > 20%)\n"
-    report += f"  [S5] Variance inter-blocs   : {inter_block_var:.3f}  (seuil > 0.08)\n"
+    report += f"  [S5a] Zones sans bruit      : {silent_ratio*100:.1f}%   (seuil > 55% global | > 20%+blocs pour composite)\n"
+    report += f"  [S5b] Variance inter-blocs  : {inter_block_var:.3f}  (seuil > 0.08 si 20-55% silencieux)\n"
     if skin_ratio >= 0.02:
         report += f"  [S6] Texture peau (std)     : {skin_std:.1f}    (seuil < 8.0, zone={skin_ratio*100:.0f}%)\n"
     else:
@@ -285,4 +294,4 @@ with gr.Blocks() as demo:
 
     run_btn.click(process, inputs=in_img, outputs=[out_plot, out_text])
 
-demo.launch(share=True, theme=gr.themes.Soft())
+demo.launch(share=True, theme=gr.themes.Soft())