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This paper proposed a chaotic image scrambling scheme based on sorting transformation. The algorithm calculates the permuting address codes by sorting the chaotic sequence. Therefore, the scheme does not require knowing the probability density function of the chaotic orbits in advance, thus not only facilitating the choice of chaotic systems but also reducing the complexity of the scheme. The paper...
Palmprint identification is a subcategory of biometrics identification, which can be efficiently used to identify the people. Palmprint-based identification is currently a potential alternative to human identification method of a well known fingerprint-based identification. For example, if the hand of the identified person is dirty, the accuracy of fingerprint-based identification is distorted, while...
A novel method of watermarking in image spatial domains is proposed in this paper. The level transformation previously proposed for embedding watermark bits into each pixel of a source image is used adaptively with estimating the resulting subjective image quality. Thus, a desired subjective quality can be achieved on the watermarked image. First, the measurements of image quality by subjective evaluations...
In this paper, we experimental investigate if the current reversible data hiding schemes are detectable. By modeling the distributions of horizontal pixel difference of natural image using generalized Gaussian model, we find that the horizontal difference histogram of watermarked image is significantly altered. Furthermore, the difference between the horizontal and the vertical difference histogram...
This paper presents a novel methodology to perform matching between image points described by their respective features. Traditionally, such correspondences are determined by computing the similarity between descriptor vectors associated to each point which are obtained by invariant descriptors. Our methodology first obtains a coarse global registration among images, which constrains the correspondence...
Ownership authentication of image attended a careful attention due to global availability of internet services. Illegal copying and misappropriation of digital image leads cyber crime in an epidemic form. In aforesaid regard we've already proposed different fragile color image authentication schemes which guarantees ownership of an image through embedding color watermarks into color host images. In...
Biometrics has carved an important place in the field of identification and authentication. Identification in biometrics includes various applications like face recognition. There are scads of work done in the area of face recognition but we feel that there is not much of work has been done in the field of age determination. The age determination technique is useful to determine the age of an unknown...
Regularization plays a vital role in ill-posed problems. A properly chosen regularization can direct the solution toward a better quality outcome. An emerging powerful regularization is one that leans on image examples. In this paper, we propose a novel scheme for face hallucination. We target specially the quality of highly zoomed outputs. Our work bases on the pyramid framework and assigns several...
Precisely relating pixels in the projector image to pixels in camera image plays a significant role in many projector-camera systems. In this paper, we present a novel method of finding the correspondence in a simple and efficient manner. Our registration approach uses binary coding scheme, only need to capture a few pictures and does not need to give any assumption in the projector-camera system...
Objective quality assessment plays a very important role in the video applications, as they promise the means to evaluate the performance of acquisition, display, coding and communication systems. Objective video quality assessment still has a long way to go before it reaches the level of success. In this paper, we propose novel quality metrics for video sequences. These metrics are capable of capturing...
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