Variable dimension vector quantization based image watermarking

A Robust Digital Image Watermarking Scheme Based on DWT

In this paper a wavelet-based logo watermarking scheme is presented. The logo watermark is embedded into all sub-blocks of the LLn sub-band of the transformed host image, using quantization technique. Extracted logos from all sub-blocks are merged to make the extracted watermark from distorted watermarked image. Knowing the quantization step-size, dimensions of logo and the level of wavelet tra...

A Robust Digital Image Watermarking Scheme Based on DWT

In this paper a wavelet-based logo watermarking scheme is presented. The logo watermark is embedded into all sub-blocks of the LLn sub-band of the transformed host image, using quantization technique. Extracted logos from all sub-blocks are merged to make the extracted watermark from distorted watermarked image. Knowing the quantization step-size, dimensions of logo and the level of wavelet tra...

Low Bandwidth Video Compression with Variable Dimension Vector Quantization

This paper presents a new video compression algorithm targeting low bandwidth conversational applications. Based on variable dimension vector quantization, video frames are encoded with variable sized image blocks in a manner which gives precise control over the number of bits assigned to each frame and hence over the transmission delay. This algorithm is compared with an implementation of H.26...

A novel digital image watermarking scheme based on the vector quantization technique

An Image Watermarking Method Based on Mean-Removed Vector Quantization for Multiple Purposes

Digital watermarking technique has been presented to solve copyright protection, copy protection, and content authentication issues in the digital world. Conventional watermarking algorithms are mostly designed for only one purpose. In recent years, some multipurpose digital watermarking methods based on discrete wavelet transform (DWT) and discrete Fourier transform (DFT) have been presented t...