Heng-Sung Liu

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Video-based face recognition has drawn a lot of attention in recent years. On the other hand, Bag-of-visual Words (BoWs) representation has been successfully applied in image retrieval and object recognition recently. In this paper, a video-based face recognition approach which uses visual words is proposed. In classic visual words, Scale Invariant Feature(More)
Spoofing attack (or copy attack) is a fatal threat for biometric authentication systems. In this paper, we present a novel liveness detection method based on frequency entropy of image sequences against the photograph spoofing. By splitting the color video of face region into RGB channels, we can obtain the time sequences of each color channel. Then, three(More)
Video-based Heart Rate Measurement has drawn a lot of attention in recent years. A few papers have been proposed in this work and most of them applied Fourier transform peak interval determination method for heart rate measurement. However, the analyzing duration for one outcome in these methods is usually longer than 15 seconds. This is because that the(More)
The customer analysis can be applied widely in many situations, such as surveillance system, digital signage, store entrance, etc. In digital signage application, when customers are viewing ads, the system can automatically analyze multiple attributes of customers, including customer's gender, age, height, viewing distance, the degree of interest and total(More)
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