An interesting prohlem in digital forensics is that given a digital image, would it he possihle to identify the camera model which was used to obtain the image. In this paper we look at a simplified version of this problem by trying to distinguish between images captured by a limited number of camera models. We proposc i number of features which could be used by a classifier to idcntify the source camera of an image in a blind manner. We also provide experimental results and show reasonable accuracy in distinguishing images from the two and five different camera models using the proposed features.

We present a novel technique for steganalysis of images that have been subjected to embedding by steganographic algorithms. The seventh and eighth bit planes in an image are used for the computation of several binary similarity measures. The basic idea is that the correlation between the bit planes as well as the binary texture characteristics within the bit planes will differ between a stego image and a cover image. These telltale marks are used to construct a classifier that can distinguish between stego and cover images. We also provide experimental results using some of the latest steganographic algorithms. The proposed scheme is found to have complementary performance vis-à-vis Farid's scheme in that they outperform each other in alternate embedding techniques

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For the past few decades global attention and interest has grown in the application of Ductile Steel Plate Walls (DSPW) for building lateral load resisting systems. Advantages of using DSPWs in a building as lateral force resisting system compromise stable hysteretic characteristics, high plastic energy absorption capacity and enhanced stiffness, strength and ductility. A significant number of experimental and analytical studies have been carried out to establish analysis and design methods for such lateral resisting systems, however, there is still a need for a general analysis and design methodology that not only accounts for the interaction of the plates and the framing system but also can be used to define the yield and ultimate resistance capacity of the DSPW in bending and shear combination. In this paper an analytical model of the DSPW that characterizes the structural capacity in the shear and bending interaction is presented and discussed. This proposed model provides a good understanding of how the different components of the system interact, and is able to properly represent the system's overall hysteretic characteristics. The paper also contributes to better understand the structural capacity of the DPSW and of the shear and bending interaction. The simplicity of the method permits it to be readily incorporated in practical non-linear dynamic analyses of buildings with DSPWs. To demonstrate the effectiveness of the proposed model, its predicted response is compared with results from experimental studies performed by various researchers.