wavelet compression


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wavelet compression

A lossy compression method used for color images and video. Instead of compressing small blocks of 8x8 pixels (64 bits) as in JPEG and MPEG, the wavelet algorithms compress the entire image with ratios of up to 300:1 for color and 50:1 for gray scale.

Wavelet compression also supports nonuniform compression, where specified parts of the image can be compressed more than others. There are several proprietary methods based on wavelet mathematics, which are available in products from companies such as Summus, Ltd. (www.summus.com) and Algo Vision LuraTech GmbH (www.luratech.com). See lossy compression and JPEG 2000.


Amazing Compression Ratios
This picture was compressed at 156:1 with InfinOp's Lightning Strike software. The original file was more than a million bytes and compressed down to 7.5K. This image is amazingly good especially considering that it contains only 128 colors. (Image courtesy of InfinOp, Inc.).
References in periodicals archive ?
Similarly, from 4-8 on x-axis, wavelet compression along with 30%, 50%, 75%, and 90% opening of two-inch valve has been used to detect leakage.
Wavelet compression algorithms (eg, discrete wavelet transform) are based on the use of high- and low-pass filters coupled with complex mathematics to produce compressed image data.
And at the higher compression ratios that produce blocky artifacts in JPEG, said Reiter Wavelet compression will yield a faithful rendering of the original image.
The large internal storage capacity (up to 1 terabyte) and highly efficient wavelet compression facilitate archiving of up to three months of retrievable data.
Additional features include wavelet compression technology for long-term, high-quality image storage, password-protected file access that meets HIPAA regulations and a RAID 5 drive system for reliable, redundant storage.
NDVMS manufacturers are currently using technologies like MPEG and Wavelet compression to reduce the size of the data before it is transferred across a network.
The four-channel recorder features wavelet compression, multitrack recording, extensive password management, easy installation, camera sabotage protection, and optional MPEG-4 transmission.
It utilizes the Wavelet Compression format for network transmission.
Both models use hybrid wavelet compression for greater storage with high-quality images.
New algorithms using wavelet compression provide for visibly lossless compression on standard X-rays to be performed at compression rates exceeding 30:1.

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