Chengzhang Qu

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Password-based authentication is easy to use but its security is bounded by how much a user can remember. Biometrics-based authentication requires no memorization but 'resetting' a biometric password may not always be possible. In this paper, we propose a user-friendly authenti-cation system (KinWrite) that allows users to choose arbitrary , short and(More)
A novel approach is proposed in this paper for automatic forest fire detection from video. Based on 3D point cloud of the collected sample fire pixels, Gaussian mixture model is built and helps segment some possible flame regions in single image. Then the new specific flame pattern is defined for forest, and three types of fire colors are labeled(More)
In this paper, we propose a real-time forest fire detection algorithm using artificial neural networks based on dynamic characteristics of fire regions segmented from video images. Fire region is obtained from image with the help of threshold values in HSV color space. Area, roundness and contour are computed for fire regions from each 5 continuous frames.(More)
—In the methods of video based fire detection, wavelet was usually used to test whether a pixel belongs to fire region, while Fast Fourier Transform was used to describe the contour of fire area. We try these two methods on images with forest flame, and develop one new approach combined both wavelet and FFT. In our method, contour of fire is found firstly,(More)
In material science and engineering, the grain structure inside a super-alloy sample determines its mechanical and physical properties. In this paper, we develop a new Mul-tichannel Edge-Weighted Centroidal Voronoi Tessellation (MCEWCVT) algorithm to automatically segment all the 3D grains from microscopic images of a super-alloy sample. Built upon the(More)
—Detecting human interactions in a public place where no physical touch occurs has important applications in many surveillance tasks. In this paper, we explore the possibilities to automatically detect such distant human interactions without recognizing the specific human actions. Specifically, we use a highly simplified formulation of the interaction in(More)
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