In this paper a detailed study regarding Digital Image Forgery on Jpeg images is provided. Here, copy-paste block detection on a special case of double Jpeg compression Shifted Double Jpeg Compression, is identified based on the characteristics of Double Jpeg compression. In certain cases the tampered image will be cropped, the paper uses properties of Block Artifacting method to identify such ...

Digital imagery is pervasive in our world today. Consequently, standards for the efficient representation and interchange of digital images are essential. To date, some of the most successful still image compression standards have resulted from the ongoing work of the Joint Photographic Experts Group (JPEG). This group operates under the auspices of Joint Technical Committee 1, Subcommittee 29,...

Due to its relative simplicity, the JPEG compression algorithm requires less hardware or software resources with respect to new compression algorithms, for example the JPEG2000 and the JPEG XR. This makes it suitable for low-power applications. Moreover, features embedded in the JPEG2000 and the JPEG XR, such as the scalability of the image stream, can be added to the main JPEG core, making an ...

The aim of this project was to examine the optimization possibilities of the standard JPEG code and to extend the capabilities of JPEG by adding a Motion JPEG coder. In the beginning of the project the possibility of optimization of the JPEG code, as written in C, was examined along with a thorough search for algorithms that could perform specific, time consuming tasks faster. Along with the st...

The JPEG Images play a significant role in present multimedia based computing industry. Being a popular lossy mode of image compression, The JPEG has extensively been being used in almost all sorts of digital device including the mobile phones, tablet and handheld computers. Although the popularly used Baseline JPEG Algorithm is an easy one to be performed by the powerful processors, sti ll the...

—All Phase Biorthogonal Transform (APBT), a DCTlike transform generated from All Phase Digital Filter (APDF), can be used in baseline JPEG by replacing conventional Discrete Cosine Transform (DCT), and the image compression scheme is called APBT-based JPEG (APBT-JPEG). APBTJPEG can achieve better coding performance but at the expense of an increased computational complexity, because there is n...

In this paper, modeling of optimized Discrete Cosine Transform (DCT) with reduced hardware and implementation of JPEG Image compression in MATLAB is presented. DCT is the heart of the JPEG image compression. The computation of DCT is hardware intensive and power consumption is also very high. In JPEG Image Compression pipeline, a quantizer follows the DCT. Such structural pipeline is advantageo...

In this paper, a new steganalysis scheme is presented to effectively detect the advanced JPEG steganography. For this purpose, we first choose to work on JPEG 2-D arrays formed from the magnitudes of JPEG quantized block DCT coefficients. Difference JPEG 2-D arrays along horizontal, vertical and diagonal directions are then used to enhance changes caused by JPEG steganography. Markov process is...

This paper describes methods to recover the useful data in JPEG and JPEG 2000 compressed images and to estimate data for those portions of the image where correct data cannot be recovered. These techniques are designed to handle the loss of hundreds of bytes in the file. No use is made of restart markers or other optional error detection features of JPEG and JPEG 2000, but an uncorrupted low re...