Sociologia e Criminologia-Acesso Aberto
Acesso livre

Abstrato

Integrated Analysis of Speech and Thermal Videos during Interactive Sessions for Detection of Deceit

Saswata Satpathi*

Polygraphy is an age-old gold standard for lie detection by the police department. In due course of time, many modern methods have come out for lie or deceit detection which are more simplified and accurate. Thermal video analysis is one of them. During an interrogation process thermal video is captured and subsequently analyzed for detecting the act of lying. At the same time a person’s behavior can be analyzed from the audio recording which could be another important clue for deceit detection. In the present study, a real-life database has been generated by creating a real crime of stealing scenario. During the interrogation process the thermal video and audio recordings have been carried out simultaneously in a concealed manner. The temperature of the forehead and periorbital areas is extracted to measure the blood flow rate. It was observed that in case of person who is lying, the temperature of these areas increased more than those of truth-tellers. Analysis of the speech of the subjects was also carried out to understand the difference in the pattern of speech attributes of liars and truth-tellers. It was found that liars take more silent pauses and have higher values of the pitch in their voice when they were being interrogated. Finally, we have combined the effect of thermal video and audio analysis for decision making.