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We present a novel lossless (reversible) data-embedding technique, which enables the exact recovery of the original host signal upon extraction of the embedded information. A generalization of the well-known least significant bit (LSB) modification is proposed as the data-embedding method, which introduces additional operating points on the(More)
Several fragile watermarking schemes presented in the literature are either vulnerable to vector quantization (VQ) counterfeiting attacks or sacrifice localization accuracy to improve security. Using a hierarchical structure, we propose a method that thwarts the VQ attack while sustaining the superior localization properties of blockwise independent(More)
We describe an algorithm for detecting human faces and facial features, such as the location of the eyes, nose, and mouth. First, a supervised pixel-based color classiier is employed to mark all pixels that are within a prespeciied distance of \skin color," which is computed from a training set of skin patches. This color-classiication map is then smoothed(More)
combine multiple cues, such as color, texture, shape, and layout, frequently without user interaction. These include We describe a system which automatically annotates images with a set of prespecified keywords, based on supervised color IBM’s Query-by-Image-Content (QBIC) [10], MIT’s Phoclassification of pixels into N prespecified classes using simple(More)
Image segmentation is a fundamental task in many computer vision applications. In this paper, we propose a new unsupervised color image segmentation algorithm, which exploits the information obtained from detecting edges in color images in the CIE L<sub>*</sub>a<sub>*</sub>b<sub>*</sub> color space. To this effect, by using a color gradient detection(More)
In recent years, the acquisition of image and video information for processing, analysis, understanding, and exploitation of the underlying content in various applications, ranging from remote sensing to biomedical imaging, has grown at an unprecedented rate. Analysis by human observers is quite laborious, tiresome, and time consuming, if not infeasible,(More)
Geometric structure of a scene can be reconstructed using many methods. In recent years, two prominent approaches have been digital photogrammetric analysis using passive stereo imagery and feature extraction from lidar point clouds. In the first method, the traditional technique relies on finding common points in two or more 2D images that were acquired(More)
Segmentation Y.Xu (1) ,P.Duygulu, E.Saber, A.M. Tekalp, F.T.Yarman-Vural (1). Department of Electrical and Computer Engineering, University of Rochester, Rochester, NY 14627 E-mail: {yaxu, saber, tekalp}@ece.rochester.edu (2)Department of Computer Engineering, Middle East Technical University,Ankara,Turkey,TR-06531 E-mail:{duygulu,vural}@ceng.metu.edu.tr(More)