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)
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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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