intoPIX - JPEG2000 compression

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Information about intoPIX - JPEG2000 compression

Published on March 17, 2009

Author: aSGuest14908


About JPEG2000 : About JPEG2000 New image coding system based on wavelet technology In 2004, it was selected as the mandatory compression format for Digital Cinema Slide 3: License-free Improved Compression Efficiency Mathematically Lossless Compression Graceful Degradation Scalability Dynamic Bandwidth Allocation Robust Transmission Easy Post-Production Region of Interest (ROI) Low Latency Constant Quality through Multiple Generations Encoding - Decoding Processing Power Open Standard Slide 4: License-Free The JPEG committee has stated: “Standards should be implementable without payment of royalty and license fees” “Agreements have been reached with over 20 large organizations to allow use of their IP without payment of license fees or royalties” Improved Compression Efficiency : Improved Compression Efficiency Mathematically Lossless Compression : Mathematically Lossless Compression It enables a reduction in storage requirement of, on average, 1:2 while still being able to recover the exact original image information. Extremely important feature in fields such as digital archiving, cinema acquisition and medical imaging. Unique advantage in comparison to JPEG, MPEG2, MPEG4 Graceful Degradation : Graceful Degradation In JPEG 2000 the effect of image compression is a soft blur on high-frequency areas Image compressed with JPEG 2000 with a compression ratio of 400:1 Image compressed with JPEG 2000 with a 2:1 compression ratio Scalability : Scalability JPEG 2000 is able to extract multiple versions out of a single compressed file This scalability provides Easy proxy generation Region of Interest Bandwidth optimization and adaptative transmission Slide 9: Example of a Progression in Quality Dynamic Bandwidth Allocation : JPEG 2000 scalability over highly variable channels (over-IP or Wireless) provides a powerful dynamic quality allocation. Giving priority to fundamental data packets allows ‘best achievable quality’ for the available bandwidth Increasing redundancy of fundamental data packets also guarantees a minimum image quality for weak signals Dynamic Bandwidth Allocation Robust Transmission : Robust Transmission JPEG 2000 intrinsic robustness prevents having dramatic visual impact when packets are missing or corrupted JPEG 2000 intra-frame nature gives another advantage to long-GOP formats: it limits the impact of the missing or corrupt packet to a single frame Easy Post-Production : Easy Post-Production Easy-Proxy From a single file editors can extract a proxy and use full resolution image for the rendering chain Easy Editing Intra-frame coding enables editors to easily access each frame Region Of Interest (ROI) : Region Of Interest (ROI) JPEG 2000 is also able to prioritize a user defined area of the image, to which it will provide the full quality layer Low Latency : Low Latency Intra-frame allows every frame to be encoded independently allowing latency of less than 1 frame In comparison, inter-frame encoding formats (e.g. MPEG2, MPEG4) need to work with Groups of Pictures (GOP) that require a longer processing time……. Low latency is a critical consideration in many applications……………….. Constant Quality Through Multiple Generations : Successive encoding-decoding passes are usually required throughout the Broadcast and Digital Cinema post-production processing chain JPEG 2000 provides a constant image quality throughout the production process Constant Quality Through Multiple Generations Processing Power : Processing Power JPEG 2000 is a symmetrical compression technology requiring approximately the same processing power to encode or to decode at any compression quality The JPEG 2000 standard supports every resolution, color depth, number of components and frame rate It is the image compression format most ready to address future applications Open Standard Slide 18: Pre-Processing Wavelet Transform Compression Rate Control Data Ordering Pre-Processing : Pre-Processing The pre-processing block mainly deals with color conversion (or decorrelation): RGB ? YCbCr (Irreversible Color Transform) RGB ? YUV (Reversible Color Transform) The Discrete Wavelet Transform : The Discrete Wavelet Transform Components are passed recursively through low and high pass Wavelet filters This enables an intra-component de-correlation that concentrates the image information in a small and very localized area and multi-resolution image representation Slide 22: How Wavelet Decomposition Achieves Multi-Resolution Compression of the Wavelet Coefficients : Compression of the Wavelet Coefficients By itself the Wavelet Transform does not compress image data; it restructures the image information so that it is easier to compress Once the Discrete Wavelet Transform (DWT) has been applied, the output is quantized. The quantized data is then encoded in the Entropy Coding Unit (ECU) Rate Control : Rate Control Given a targeted bit-rate, the Rate-Control module adjusts the coding precision of each pixel (small groups of pixels called code-blocks) It embeds all groups of pixels in a succession of Packets. These Packets, along with additional headers, form the final JPEG 2000 code-stream In the last ‘data ordering’ block the preferred scalability (or progression order) is selected Data Ordering Codestream Syntax : Codestream Syntax The Implementation : The Implementation intoPIX provides the most flexible and powerful range of JPEG 2000 implementations available intoPIX efficient image processing allows implementation on a single FPGA intoPIX technology currently addresses Digital Cinema and Broadcast markets. Since 2004 intoPIX founders have been the editors of the reference open source code - openJPEG:

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