JPEG images are self-synchronized in cases of an error; however, after the synchronization the images are not shown as the original ones. Sometimes, the blocks are shifted to right or left and the tinge is damaged as well. This paper suggests a way how to remedy the block shift and the tinge

The challenge in the case of image authentication is that in many cases images need to be subjected to non malicious operations like compression, so the authentication techniques need to be compression tolerant. In this paper we propose an image authentication system that is tolerant to JPEG lossy compression operations. A scheme for JPEG grey scale images is proposed based on a data embedding ...

In this paper packetization and reconstruction algorithms in transmission of JPEG coded images over lossy channels are proposed. An interleaving method is devised that maximizes the minimumdistance between the 8 8 blocks, used in JPEG, that are in the same packet. Then a method for estimating the missing DC coe cients of a JPEG coded image which is required for decoding the compressed image, is...

JPEG 2000 and HD Photo (JPEG XR) enable the coding of images with several adaptivity provisions. These provisions allow taking into account the capabilities and constraints of diverse usage environments. However, the actual adaptation of coded bitstreams requires additional system complexity. This paper investigates how JPEG 2000 and HD Photo can be used in a standardized and XML-based framewor...

JPEG is one of the most widely used image formats, but in some ways remains surprisingly unoptimized, perhaps because some natural optimizations would go outside the standard that defines JPEG. We show how to improve JPEG compression in a standard-compliant, backward-compatible manner, by finding improved default quantization tables. We describe a simulated annealing technique that has allowed ...

JPEG 2000, an emerging standard for still image compression, is discussed at length. To commence, a high-level introduction to JPEG 2000 is given. This is followed by a detailed technical description of the JPEG-2000 codec. Next, the codec is evaluated. The complexity of its various components is analyzed, and its performance is compared to other existing standards. With its excellent coding pe...

Nowadays, a large number of images are compressed in JPEG (Joint Photographic Experts Group) format. Therefore, content-based image retrieval (CBIR) for the JPEG images has attracted many people’s attention and a series of algorithms directly based on the discrete cosine transform (DCT) domain have been proposed. However, the existing methods are far from the practical application. Thus, in thi...

High Efficiency Video Coding (HEVC) demonstrates a significant improvement in compression efficiency compared to H.264/MPEG-4 AVC, especially for video with resolution beyond HD, such as 4K UHDTV. One advantage of HEVC is the improved intra coding of video frames. Hence, it is natural to question how such intra coding compares to state of the art compression codecs for still images. This paper ...

A JPEG Quality Transcoder (JQT) converts a JPEG image file that was encoded with low image quality to a larger JPEG image file with reduced visual artifacts, without access to the original uncompressed image. In this article, we describe technology for JQT design that takes a pattern recognition approach to the problem, using a database of images to train statistical models of the artifacts int...

The new Motion JPEG 2000 standard is providing with some compelling features. It is based on an intra-frame wavelet coding, which makes it very well suited for wireless applications. Indeed, the state-of-the-art wavelet coding scheme achieves very high coding efficiency. In addition, Motion JPEG 2000 is very resilient to transmission errors as frames are coded independently (intra coding). Furt...