Dr. Joan L. Mitchell Profile

Dr. Joan L. Mitchell

at InfoPrint Solutions Co

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Publications (5)

Proceedings Article | 15 September 2008 Paper

ITU-T T.851: an enhanced entropy coding design for JPEG baseline images

Joan Mitchell, Arianne Hinds

Proceedings Volume 7073, 707313 (2008) https://doi.org/10.1117/12.797093

KEYWORDS: Standards development, Image compression, Computer programming, Binary data, Data compression, Data modeling, Performance modeling, Telecommunications, Quantum efficiency, Photography

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Proceedings Article | 13 September 2008 Paper

CIELAB to CMYK color conversion in the transform domain for JPEG compressed images

Yue Qiao, Joan Mitchell, Nenad Rijavec, Arianne Hinds

Proceedings Volume 7073, 707306 (2008) https://doi.org/10.1117/12.796915

KEYWORDS: CMYK color model, Data modeling, Data conversion, Printing, Image compression, Data centers, Space operations, Mathematical modeling, RGB color model, Digital image processing

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SPIE Journal Paper | 1 April 2004

Introduction to Digital Audio Coding and Standards

Joan Mitchell

JEI, Vol. 13, Issue 02, (April 2004) https://doi.org/10.1117/12.10.1117/1.1695413

Proceedings Article | 28 December 2001 Paper

High-speed multilevel halftoning hardware

Michael Brady, Charles Morris, Joan Mitchell

Proceedings Volume 4663, (2001) https://doi.org/10.1117/12.452996

KEYWORDS: Printing, Halftones, Binary data, Matrices, Logic, Clocks, Head, Imaging systems, Multichannel imaging systems, Data processing

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Proceedings Article | 1 March 1991 Paper

Evolving JPEG color data compression standard

Joan Mitchell, William Pennebaker

Proceedings Volume 10259, 1025906 (1991) https://doi.org/10.1117/12.48892

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An international team of technical experts, the Joint Photographic Experts Group (JPEG), has been working for the past four years on a color image data compression standard for use worldwide in a variety of still image applications. This joint committee operated under ISO/IEC JTCl/SC2/Working Group 8 (Coded Representation of Picture and Audio Information) until it recently moved to a new working group, ISO/IEC JTC1/SC2/WG10 (Photographic Image Coding). The work is being done jointly with a special rapporteur group on image communication within CCITT Study Group VIII.

Within the United States, work in support of this international activity is focused within the U.S. picture coding committee, Accredited Standards Committee X3 Technical Committee X3L3 (formerly Task Group X3L2.8). Other standards applications groups are eagerly awaiting the completion of JPEG in order to effectively incorporate color images into their application environments.

JPEG's intensive technical research and refinement stages have been completed and an International Standards Organization (ISO) Committee Draft for the evolving JPEG data compression standard has been submitted for international balloting. Extensive testing of the applicability to various environments is in progress. Companies are beginning to announce JPEG software or hardware availability, even though they recognize that the JPEG algorithm may change.

This paper will provide a critical review of the evolving JPEG color image data compression standard. A history of JPEG is given first, followed by the steps still needed for adoption of JPEG as an international image data compression standard. Then the JPEG "toolkit" is explored with additional detail on the entropy coders and data interleave conventions. In the results section, the compression performance numbers on the JPEG test images are given for the baseline Huffman sequential coding system both with and without resynchronization. The arithmetic coding results are given for the sequential DCT-based mode with and without resynchronization, several progressive DCT-based processes and the sequential lossless mode. The final section briefly notes some applications and implementations of JPEG.

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