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In this paper, we discuss a face recognition scheme by subspace analysis of 2D log-Gabor wavelets features. In which, an input face image is firstly decomposed with a set of two dimensional log-Gabor wavelets (2D-LGWs) localized with respect to spatial location, orientation and frequency. Based on complex responses of filters, local energy model (LEM) is used to represent log-Gabor features (LGFs)...
Segmentation is an important step in fingerprint recognition ystem, in which the region of interest can be extracted. his paper presents a novel fingerprint image segmentation method aiming at dealing with low quality fingerprint images. Firstly the mean and variance of gray level in each divided block is used to differentiate the image coarsely. Then two new features intra-consistency and extra-consistency...
Based on the study of patterns used in many fast algorithms for the block-matching motion estimation (BMME), a new search pattern, LP (line search pattern), was introduced in this paper. LP is also a simplified square search pattern as TP(Triangle search Pattern). By combing LP with DP(diamond search pattern), a fast BMA (BMME Algorithm), DLS (diamond-line search), was also proposed in this paper...
Attributions including the type of minutiae, the curvature of ridge, the length ratio of 2 line segments of ridge and the relative topological relationship among minutiae and ridges were used in partial and/or nonlinear distorted fingerprint matching. Three kinds of criterions were defined to describe the pattern of fingerprint. Fingerprint was matched in steps according to the criterions consist...
Camera calibration is one of critical steps in computer vision, also an exhaustive process because substantial human computer interactions are frequently required to deal with the matching problem. In this paper, an automatic matching method of markers for camera calibration is presented based on the local architecture characteristics of a new planar circle pattern, which can be applied to a wide...
In this paper, we have proposed a novel algorithm for fingerprint segmentation. Firstly, we originally use the method of gradient projection to eliminate those background regions which have smaller gray contrast, and then obtain the approximate foreground region of the fingerprint image. In addition, we adopt the gradient coherence criteria to exclude the regions which contain irregular stains and...
In this paper, we proposed a real-time algorithm to detect and track the target circle based on region growing and accurately locating by multi-resolution. The proposed algorithm consists of edge detecting, region growing, the possible centre of circle estimating and the centre of circle accurate locating in turn. Firstly, we use Prewitt operator to form the edge of image and divide the formed edge...
In this paper, we studied the algorithms of fingerprint image enhancement and put forward a new method to calculate the direction image. Firstly, Radon Transform is used to estimate the direction image, then, the image is filtered by a set directional filters, thus, we get the enhanced image. The experiment results indicate that this method is simple and efficient; which established the firmed foundation...
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