ADI's JPEG2000 solution can extract, compress and transmit video images at variable resolutions without further signal processing.
The JPEG2000 solution is characterized by ADI's SURFTM (Spatial Ultra Efficient Recursive Filtering) wavelet technology, which enables real-time compression and resolution scalability. This is particularly attractive to the HD market because once HD content is compressed, it can be decompressed by multiple display methods with different resolutions. For example, the same video source transmitted by one stream can be simultaneously received and displayed by HDTV, SDTV and PDA devices, and each device can only process the information it needs.
As long as some stored data is deleted, the stored and compressed image can be reduced in size without decoding-because all frames are equivalent to still images, but the image quality after the size reduction is worse than the original. This is very attractive for digital video recorder (DVR) applications. DVR programs are first recorded at the highest resolution, but later on by reducing the size to free up hard disk space to store more compressed content. Currently, the only HD-DVR systems on the market are installed in set-top box products, and record pre-compressed video streams, because real-time HD video compression using traditional methods is impractical in the home. ADV202 provides a low-cost solution, it can compress any HD video input source in real time, has extremely high playback quality, and provides a very flexible recording function.
The unique stream based on wavelet also supports optional packet protection. Even if the channel noise is so severe that some packet errors cannot be corrected, the video quality will slowly decline. Most viewers think that MPEG-2 or other time-domain compressed video streams have unacceptable video quality under noisy channel conditions.
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