Image Compression by Wavelet Packets

Stack-run Adaptive Wavelet Image Compression Using Wavelet Packets

We report on the development of an adaptive wavelet image coder based on stack-run representation of the quantized coefficients. The coder works by selecting an optimal wavelet packet basis for the given image and encoding the quantization indices for significant coefficients and zero runs between coefficients using a 4-ary arithmetic coder. Due to the fact that our coder exploits the redundanc...

Compression of AVHRR images by wavelet packets

AVHRR is an imager flying on polar meteorological satellites that, due to its spatial resolution (about 1 km at Nadir view), produces a huge amount of data. A method based on the wavelet packet transform is devised to compress AVHRR images. The method is driven by the compression error (application dependent), so that different types of images have the same quality. The best basis wavelet packe...

Adaptive Image Compression with Wavelet Packets and Empirical Mode Decomposition

Adaptive Image Compression of Arbitrarily Shaped Objects Using Wavelet Packets

With the emergence of objectbased image coding standards and the successful use of adaptive image coding techniques for various applications, the combination of both fields in objectbased adaptivity is only logical, as it promises not only better compression efficiency, but also increased functionality. In this work, we present approaches of objectbased and adaptive image compression using wave...

Image Compression Method Based on QR-Wavelet ‎Transformation

In this paper, a procedure is reported that discuss how linear algebra can be used in image compression. The basic idea is that each image can be represented as a matrix. We apply linear algebra (QR ‎factorization and wavelet ‎transformation ‎algorithm‏s) on this matrix and get a reduced matrix out such that the image corresponding to this reduced matrix requires much less storage space than th...