The file format can achieve typical compression ratios from 1:2 to 1:100. Data flow compression allows for compression of large images with small RAM requirements. Image data of up to 65,535 bands (layers or colors) can be compressed into the ECW v2 or v3 file format at a rate of over 25 MB per second on an i7 740QM (4-cores) 1.731 GHz processor using v4.2 of the ECW/JP2 SDK. Map projection information can be embedded into the ECW file format to support geospatial applications. v5 of the SDK was released on 2 July 2013. After subsequent purchase by ERDAS (themselves subsequently merged into Intergraph), the software development kit was renamed to the ERDAS ECW/JP2 SDK. Īfter JPEG2000 became an image standard, ER Mapper added tools to read and write JPEG2000 data into the ECW SDK to form the ECW JPEG2000 SDK. Indirectly Hexagon AB owns these patents because they acquired Leica Geosystems in 2005 who had acquired ERDAS Inc in 2001.
through the acquisition of Earth Resource Mapping on May 21, 2007.
These patents have been obtained by ERDAS Inc.
ECW represented a fundamental mathematical breakthrough enabling Discrete Wavelet Transforms (DWT) and inverse-DWT operations to be performed on very large images very quickly, while only using a tiny amount of RAM. The outcome of that research was two products, Image Web Server (IWS) and ECW. In 1998 Earth Resource Mapping Ltd in Perth, Western Australia company founder Stuart Nixon, and two software developers Simon Cope and Mark Sheridan were researching rapid delivery of terabyte sized images over the internet using inexpensive server technology. The lossy compression format efficiently compresses very large images with fine alternating contrast while retaining their visual quality. It was developed by Earth Resource Mapping, and is now owned by Intergraph part of Hexagon AB. ECW ( Enhanced Compression Wavelet) is a proprietary wavelet compression image format optimized for aerial photography and satellite imagery.
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