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 became owner of 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 were obtained by ERDAS Inc. Related (now expired) patents included US 6201897 and US 6442298 for ECW and US 6633688 for IWS.
ECW enables discrete wavelet transforms (DWT) and inverse-DWT operations to be performed quickly on large images while using a relatively small amount of memory. 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 (founder of Nearmap) and two software developers Simon Cope and Mark Sheridan were researching rapid delivery of terabyte sized images over the internet using inexpensive server technology. It is a lossy compression format for images. It was developed by Earth Resource Mapping, which is now owned by Intergraph, part of Hexagon AB. ECW ( Enhanced Compression Wavelet) is a proprietary wavelet compression image format used for aerial photography and satellite imagery.
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