A Novel Strategy for Improving the Quality of Embedded Zerotree Wavelet Images Transmitted over Alamouti Coding Systems
نویسندگان
چکیده
This work deals with the transmission of images, previously coded using the Embedded Zerotree Wavelet (EZW) transform, over wireless systems in which Space-Time Coding (STC) is used. It is shown how the system performance, measured in terms of Peak Signal to Noise Ratio (PSNR), can be improved using bit allocation strategies that take into account the special structure of the EZW bitstream, where the bits firstly allocated are associated to the lowest frequency subbands, and therefore, an error–free transmission of such bits will be crucial to appropriately recover the transmitted image.
منابع مشابه
SPIHT-NC: Network-Conscious Zerotree Encoding
Wavelet zerotree encoding has been proven to be an efficient way of compressing still images. Two well-known zerotree encoding algorithms, Embedded Zerotree Encoding (EZW) and Set Partitioning in Hierarchical Trees (SPIHT), provide excellent progressive display when images are transmitted over reliable networks. However, both algorithms are state-dependent and can perform poorly over unreliable...
متن کاملThe Medical Image Compression with Embedded Zerotree Wavelet
The rapid growth of digital imaging applications, including desktop publishing, multimedia, teleconferencing and high definition television, (HDTV) has increased the need of effective image processing. While processing any data, it requires large memory space for storage, which ultimately increases the transmission time. In order to save memory space and speed up the rate of transmission of dat...
متن کاملEmbedded Wavelet Image Compression Algorithm Based On Full Zerotree
In this paper, a novel embedded wavelet image compression algorithm, NEFZW (Novel Embedded Full Zerotree Wavelet) algorithm is proposed. The relationship of the intra scale subbands is exposed by the statistical experiments on various test images. Since “zerotree” indicates specially the inter scale relationship in EZW, the concept of full zerotree is proposed which includes both the relationsh...
متن کاملApplication level framing applied to image compression
Two well-known wavelet zerotree encoding algorithms, Embedded Zerotree Encoding (EZW) and Set Partitioning in Hierarchical Trees (SPIHT), provide excellent progressive display when images are transmitted over reliable networks. However, both algorithms are state-dependent and can perform poorly over unreliable networks. In this paper, we apply the concept of network-conscious image compression ...
متن کاملWavelets and their usage on the medical image compression with a new algorithm
Technically, all image data compression schemes can be categorized into two groups as lossless (reversible) and lossy (irreversible). Although some information is lost in the lossy compression, especially for the radiologic image compression, new algorithms can be designed to minimize the effect of data loss on the diagnostic features of the images. Wavelet transform (WT) constitute a new compr...
متن کامل