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With the increasing use of multimedia technologies, image compression requires higher performance and new features. The JPEG2000 standard is intended to advance standardized image coding systems to serve applications into the next millennium.

While JPEG2000 will provide superior rate-distortion and subjective image quality performance than existing standards, JPEG2000 will be defined by its features. It will provide functionality vital to many high-end and emerging imaging applications by taking advantage of new modern technologies. Specifically, this new standard will address areas where current standards fail to produce the best quality or performance and will provide capabilities to markets that currently do not use compression.



Progressive Transmission by pixel accuracy and resolution (Scalability)
Demonstration of Progressive Transmission by pixel accuracy.
Progressive transmission allows images to be reconstructed with different resolutions and pixel accuracy, as needed or desired, for different target devices. The image architecture of JPEG2000 provides for efficient delivery of image data in Internet and client/server applications.

Error Resilience/Transmission in noisy environments:
Many communication channels, such as wireless and Internet, are prone to random bit errors and loss of data during transmission. The current JPEG standard has provision for restart intervals, but image quality suffers dramatically when bit errors are encountered. JPEG2000 is built with error resilience tools and robustness to bit-errors, which allows for error detections and concealment, guaranteeing more reliable, better image transmission in noisy environments.

Region-of-Interest Compression:
JPEG2000 will include a Region-Of-Interest (ROI) coding feature so that certain areas of an image can be coded with better quality than the rest of the image (background). The ROI area is placed at the beginning of the file's bitstream so that the ROI will be decompressed before the rest of the image, allowing more reliable, faster access to regions of an image that are deemed more important.

Inclusion of Metadata & ICC profiles:
The JPEG2000 format has a mechanism by which metadata, such as tonescale, colorspace, intellectual property rights or other file information can be included in the image file.

Compound documents:
Currently, JPEG is seldom used in the compression of compound documents because of its poor performance when applied to bi-level (text) imagery.

Low bit-rate compression performance:
Current standards, such as IS 10918-1 (JPEG), offer excellent rate-distortion performance in the mid and high bit-rates. However, at low bit-rates (e.g., below 0.25 bpp for highly detailed gray-level images) the distortion, especially when judged subjectively, becomes unacceptable.

Lossless and lossy compression:
There is no current standard that can provide superior lossless compression and lossy compression in a single codestream.

Large images:
Currently, the JPEG image compression algorithm does not allow for images greater then 64K by 64K without tiling.

Single decompression architecture:
The current JPEG standard has 44 modes, many of which are application specific and not used by the majority of the JPEG decoders. Greater interchange between applications can be achieved if a single common decompression architecture encompasses these features.

Computer generated imagery:
The current standard was optimized for natural imagery and does not perform well on computer generated imagery.

Support for Alternate Color Spaces:
Currently, JPEG only supports RGB data.



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