利用臉部表情線索進行謊言偵測

Deception Detection by Facial Cues

歐苑詩(Ao, Un Si)

指導教授 ： 蔡子晧 ； 謝文萍

國立清華大學/理學院/統計學研究所/碩士(2017年)

摘要

說謊為人類交流的一部分；儘管至今為止沒有一個既定的線索被認定為是說謊時的特徵，一般相信因人們在說謊時有較大的認知負載，導致某些語言及視覺上的特定表現發生。此研究中訪問了23名21至29歲參與者收集到共498個誠實及撒謊的回答，然後用臉部特徵點定位系統偵測出臉部特徵點後建構三種臉部線索作謊言偵測。三種線索分別為臉部特徵點距離對中立表情的變化，特徵點距離平均變化量及眨眼頻率。羅吉斯迴歸用於探討二元類別依變數（誠實或撒謊的回答）及建構的臉部線索之關係。結果顯示緊張的行為如嘴唇緊閉及較低的眨眼頻率跟說謊有顯著關係。

關鍵字

謊言偵測 ； 臉部線索 ； 羅吉斯迴歸

並列摘要

Deception is part of human interaction. Even though there is not a specific clue ties to deception, it is believed that certain verbal and nonverbal cues can be observed on liars due to heavy cognitive load needed for deception. In this study, 23 participants, age ranged from 21 to 29, were interviewed to collect a total of 498 truthful and deceptive responses, and then three facial cues were automatically constructed with a public facial landmark detection system for deception detection. The three cues included participants’ facial landmark distance change over neutral state, average facial landmark distance variation over frames and blinking frequency in a response. With a binary dependent variable as truthful and deceptive responses, logistic regression was used to study the relation between facial cues and deception. Result shows that tense behaviors as tightening lips and lower blinking frequency are significantly related to deception.

並列關鍵字

deception detection ； facial cues ； logistic regression

參考文獻

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Ekman, P., & Friesen, W. V. (2003). Unmasking the face: A guide to recognizing emotions from facial expressions. Cambrige, MA: Major Books.