Qichuan Tian

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This paper proposes an iris recognition algorithm based on 2D zero-crossing detection and similarity classifier. Whole system is consisting of eye image capture, iris boundary localization, iris region normalization, feature extraction, pattern match, and yes/no decision. In iris feature extraction stage, iris normal region is filtered by using low(More)
Iris recognition need user cooperate, but some factors is uncertainty and unstable between image-capture set and user little, the thing that iris information is imperfect in image captured is ubiquitous. According to the problem of imperfectiris recognition, the following issues have been studied in this paper. Firstly, the main steps of iris recognition(More)
Personal identification based on biometrics technology is a trend in the future. Traditional approaches, for example, keys, ID cards, username and password, are neither satisfactory nor reliable enough in many security fields, biometrics authorizations based on face, iris, fingerprint have become a hot research filed. In those methods, iris recognition is(More)
This paper is devoted to the problem of Multi-face localization on embedded DSP image processing system. The application of face localization is becoming important in machine vision, systems video monitoring and security access system. Skin color acts as an important cue for segmentation, localization and tracking of face. We capture face image on DSP image(More)
Palmprint recognition inherently implements many of the same matching characteristics that have allowed fingerprint recognition to be one of the most well-known and best publicized biometrics. Because of palm region has obvious principle line features in outline and texture features in detail, in order to describe different patterns based on palmprint, a(More)
Digital watermarking technology means that the hidden information is embedded in digital multimedia data by way of signal processing. In this paper, we firstly analyze the Fast Discrete Curvelet Transforms (FDCT) and Discrete Wavelet Transforms (DWT) which are usually used in image processing and figure out that DWT can not approximate optimally the image(More)
Digital cameras have become the most important imaging devices in all kinds of Hand-held devices. In these devices, the quality of image reconstruction is an important indicator of the overall quality of the end-user experience image, and the image resolution is a mainly parameter of Digital cameras. Usually, only incomplete color information of the scene(More)
Aiming at the problem that the data of the low cost silicon micro structural sensors is difficult to be adopted immediately because of the existing disturbance, a robust filtering method is proposed in this paper. Because the disturbance signal is not the white Gaussian noise and the statistical properties of the noise and system is not well known, it is(More)
In this paper, we describe a new approach of employing Nelder-Mead optimization (NMO) simplex method in Iris image segmentation. In this paper we are using modified way of Libor masek method. In modified Libor masek method mainly in preprocessing phase in segmentation we are using Nelder-Mead search method also called as simplex method for calculation of(More)
A method of multi-UAV positioning based on Delaunay triangulation is proposed in this paper. Considering that the durable UAV’s navigation cannot hold a good accuracy in long distance when GPS signal is denied, the UAV’s location can be calculated using the relative range from the other teams. Similar to the principle of GPS, the method(More)