In many applications, the amount and resolution of digital images have significantly increased over the past few years. For this reason, there is a growing interest for techniques allowing to efficiently browse and seek information inside such huge data spaces. JPEG 2000, the latest compression standard from the JPEG committee, has several interesting features to handle very large images. In th...

A watermarking technique based on the frequency domain is presented in this paper. The one of the basic demands for the robustness in the watermarking mechanism should be able to dispute the JPEG attack since the JPEG is a usually file format for transmitting the digital content on the network. Thus, the proposed algorithm can used to resist the JPEG attach and avoid the some weaknesses of JPEG...

In this paper, first a comparative simulation study of PSNR is done for two quantization tables, one recommended by JPEG committee and another suitable for hardware simplification. Simulation results indicate that quantization table suitable for hardware simplification can be used for designing JPEG baseline coder circuitry. Then we present a simple finite state machine (FSM) based VLSI archite...

In this paper, three compression methods, JPEG, JPEG 2000, and Vidware Vision are evaluated by different fulland no-reference objective image quality measures including Peak-Signal-to-Noise-Ratio (PSNR), structural similarity (SSIM), and Tenengrad. In the meantime, we also propose an image sharpness measure, non-separable rational function based Tenengrad (NSRT2), to address whether the compres...

JPEG 2000 is the new standard for image compression. The features of this standard makes it is suitable for imaging and multimedia applications in this era of wireless and Internet communications. Discrete Wavelet Transform and embedded bit plane coding are the two key building blocks of the JPEG 2000 encoder. The JPEG 2000 architecture for image compression makes high quality compression possi...

The discrete wavelet transform (DWT) is incorporated into the JPEG baseline system for image coding. The discrete cosine transform (DCT) is replaced by an association of two-channel filter banks connected hierarchically. JPEG block-scanning and quantization schemes are adopted while we use JPEG’s entropy coder. The changes in scanning can be incorporated into the transform block in such a way t...

Although widely used standards such as JPEG and JPEG 2000 exist in the literature, lossy image compression is still a subject of ongoing research. Galić et al. (2008) have shown that compression based on edge-enhancing anisotropic diffusion can outperform JPEG for medium to high compression ratios when the interpolation points are chosen as vertices of an adaptive triangulation. In this paper w...

We implemented a lossless compression method tailored to brain volumes. By making use of the particular characteristics of these images, we sought to improve compression ratios compared to other general encoders. We exploit global and local symmetries of sub-bands after wavelet decomposition to achieve intra-band prediction. We also implement a shift-based inter-slice DPCM prediction scheme tha...