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.).
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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.
Using hybrid wavelet compression for increased storage capacity, they can store more than one terabyte internally through hard drive upgrades.
Our image analysts found no significant difference between uncompressed files and files using wavelet compression with a QuVIS recorder.
The recorder features 120 GB (optional 240 GB) of internal storage, providing 21 days of constant recording at 1 pps per camera in LONG mode; wavelet compression at a resolution of 684 x 240; covert camena support; motion detection per input; and remote monitoring capabilities, including PTZ control.
And, the most significant difference eViewMail presents when compared to other applications resides in ESPRE's video quality which utilizes ESPRE's patented Wavelet compression video CODEC (visit www.
It features 120 GB (with an option of 240 GB) of internal storage, wavelet compression at a resolution of 684 x 240, covert camera support, motion detection per input, remote monitoring and pan/tilt/zoom control, and a user-friendly interface for programming.