I. INTRODUCTION  
II. FACE MORPHING ATTACK  
III. FACE MORPH ATTACK GENERATION  
IV. DATABASES ON MORPHING ATTACK DETECTION  
V. HUMAN PERCEPTION AND MORPHED FACE DETECTION  
VI. FACE MORPH ATTACK DETECTION TECHNIQUES  
VII. PERFORMANCE METRICS  
VIII. PUBLIC EVALUATION AND BENCHMARKING  
IX. OPEN CHALLENGES  
X. CONCLUSION