We present a low-complexity entropy coder originally designed to work in the JPEG2000 image compression standard framework. The algorithm is meant for embedded and non-embedded coding of wavelet coefficients inside a subband, and is called Subband-Block Hierarchical Partitioning (SBHP). It was extensively tested following the standard experiment procedures, and it was shown to yield a significa...

An efficient scheme for JPEG2000 SNR progressive decoding is proposed, which is capable of handling JPEG2000 compressed image data with SNR progressiveness. In order to avoid entropy decoding of the same compressed data more than once when decoding SNR progressive images, two techniques are introduced in our decoding scheme; reuse of intermediate decoding result and differential inverse discret...

The rapid growth of wireless communication has resulted in a demand for robust transmission of compressed images over wireless channels. The challenge of robust transmission is to protect the compressed image data against loss, in such a way as to maximize the received image quality. The paper addresses this problem; investigating unequal error protection of JPEG2000 compressed imagery. More pa...

The NIOS II soft core processor from Altera allows for the easy interfacing of new peripheral blocks to existing software. Using the Kakadu software implementation of JPEG2000, we have added dedicated hardware block encoders to produce an accelerated implementation. Simulation demonstrates that our simple architecture can provide a speedup of 2.55 times, compared to a pure software implementati...

This paper proposes novel techniques for improving tiling artifacts and encoding time which are two of the largest problems with the JPEG2000 encoder.. The proposed method detects tiling artifacts during the coding process and reduces them automatically using tile−boundary adaptive post−quantization. It also provides a higher speed JPEG2000 coding process. This accelerated performance was obtai...

Mathematical methods applied in the most recent image formats are presented. First of all, the application of the wavelet transform in JPEG2000 is gone through. JPEG2000 is a standard established by the same group which created the widely used JPEG standard, and it was established to solve some of the shortcomings of JPEG. Also presented are other recently established image formats having wavel...

The Discrete Wavelet Transform (DWT) forms the core of the JPEG2000 image compression algorithm. Since the JPEG2000 compression application is heavily data-intensive, the overall power dissipation is dominated by read and write operations in the memory subsystem. In our proposed architecture, low power has mainly been achieved by optimizing the memory architecture and the data access pattern. T...

This work describes a method for providing robustness to errors from a binary symmetric channel for the JPEG2000 image compression. The source rate and channel rate are jointly optimized by a stream of fixed-size channel packets. Punctured turbo codes are used for the channel coding, providing stronger error protection than previously available codes. We use a subset of the puncturing patterns ...

This paper describes a psychophysical experiment to measure visibility thresholds (VT) for quantization distortion in JPEG2000 and an associated quantization algorithm for visually lossless coding of color aerial images. The visibility thresholds are obtained from a quantization distortion model based on the statistical characteristics of wavelet coefficients and the deadzone quantizer of JPEG2...

Wireless multimedia sensor networks will have a variety of applications. Meanwhile, WMSNs produce a large amount of image data. JPEG2000 is the popular image compression standard and have some advantages. However, JPEG2000 is also high complexity and cannot be realized in an individual senor node which is limited in memory capacity, computation power and energy. Distributed image compression an...