Abstract
The JPEG standard has known an enormous market adoption.
Daily, billions
of pictures are created, stored and exchanged in this format. The
JPEG committee acknowledges this success and spends continued efforts
in maintaining and expanding the standard specifications. JPEG XT
is a standardization effort targeting the extension of the JPEG features
by enabling support for high dynamic range imaging, lossless and
near-lossless coding, and alpha channel coding, while also guaranteeing
backward and forward compatibility with the JPEG legacy format. This
paper gives an overview of the current status of the JPEG XT standards
suite. It discusses the JPEG legacy specification, and details how
higher dynamic range support is facilitated both for integer and
floating-point color representations. The paper shows how JPEG XT's
support for lossless and near-lossless coding of low and high dynamic
range images is achieved in combination with backward compatibility
to JPEG legacy. In addition, the extensible boxed-based JPEG XT file
format on which all following and future extensions of JPEG will
be based is introduced. This paper also details how the lossy and
lossless representations of alpha channels are supported to allow
coding transparency information and arbitrarily shaped images. Finally,
we conclude by giving prospects on upcoming JPEG standardization
initiative JPEG Privacy & Security, and a number of other possible
extensions in JPEG XT.
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