Distributed video coding is a video paradigm where most of the computational complexity can be transfered from video encoders to the decoders. This allows for video sequences transmission involving inexpensive encoders and powerful central decoders. Unfortunately, due to typically numerous feedback requests and needed decoder run cycles, this often leads to unacceptably long decoding latencies....

The paper presents low cost spatial image watermarking scheme where inherent anti jamming and interference rejection property of spread spectrum modulation is utilized to provide robustness against image distortions and malicious attempts to remove or tamper with the watermark. The use of error correction code allows a trade-off between degree of robustness and embedding rate for a given attack...

In this paper, an improved fast SPIHT algorithm has been presented. SPIHT and NLS (Not List SPIHT) are efficient compression algorithms, but the algorithms application is limited by the shortcomings of the poor error resistance and slow compression speed in the aviation areas. In this paper, the error resilience and the compression speed are improved. The remote sensing images are decomposed by...

Image coding with vector quantization (VQ) reveals several defects which include edge degradation and high encoding complexity. This paper presents an edge-preserving coding system based on VQ to overcome these defects. A signal processing unit first classifies image blocks into low-activity or high-activity class. A high-activity block is then decomposed into a smoothing factor, a bit-plane an...

|Image halftoning converts a high-resolution image to a low-resolution image, e.g. a 24-bit color image to a three-bit color image, for printing and display. Vector error di usion captures correlation among color planes by using an error lter with matrix-valued coe cients. In optimizing vector error lters, Damera-Venkata and Evans transform the error image into an opponent color space where Euc...

This paper proposes the efficient medical image compression as a combined approach of SPIHT and Lempel Ziv Welch coding. This novel method consists of steps such as splitting the image into bit planes and enhancing each bit plane image using the histogram equalization technique, and then it is decomposed by using 2D Fast wavelet transform and gets compressed by the Set Partitioning in Hierarich...

Today, hardware chip design with FPGA implementation for designing secure crypto processor is a growing topic due to rapidly increasing attack on digital images over internet network. In this paper, an FPGA implementation of Chaotic Map based two phase image encryption technique is proposed. First phase consists of pixel position permutation and second phase consists of bit value position permu...

LSB steganography is a one of the most widely used methods for implementing covert data channels in image file exchanges [1][2]. The low computational complexity and implementation simplicity of the algorithm are significant factors for its popularity with the primary reason being low image distortion. Many attempts have been made to increase the embedding capacity of LSB algorithms by expandin...

In this work we apply a direct sequence spread spectrum model to the watermarking of digital video First, video signal is modeled as a sequence of bit planes arranged along the time axis. Watermarking of this sequence is a two layer operation. A controlling m-sequence first establishes a pseudorandom order in the bitplane stream for later watermarking. Watermarks, defined as m-frames, supplant ...

A major problem in object oriented video coding is the efficient encoding of the shape information of arbitrarily shaped objects. Efficient shape coding schemes are also needed in encoding the shape information of Video Object Planes (VOP) in the MPEG-4 standard. In this paper, we present an efficient method for the lossy encoding of object shapes which are given as %connect chain codes [l]. We...