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When a new image spam is filtered by Tumbleweed's MailGate appliance, it goes through the same mathematical process, and the signature of the wavelet transform is compared to existing image spam signatures, blocking spam with similar but slightly varying graphics. It contains a dedicated wavelet transform engine, three entropy codecs, an onboard memory system and embedded RISC processors to provide a complete JPEG 2000 compression/decompression solution. The wavelet transform is a technology that applies two-dimensional filtering and sub-sampling (pixel decimation) in hierarchical and multi-step combinations. |
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