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MIL-STD-188-196 1993 Edition, June 18, 1993
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Includes all amendments and changes through Notice 3, March 31, 2004
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This standard establishes the requirements to be met by NITFS systems when image Data are compressed using the bi-level facsimile compression specified by the International Telecommunications Union (ITU) International Telegraph and Telephone Consultative Committee (CCITT) Recommendation T.4 and MIL-STD-188-161C for Group 3 facsimile devices. No attempt has been made to discuss image scanning, communication, or printing systems.

This standard provides technical detail of the NITFS compression algorithm designated by the code C1 in the image compression field of the image subheader for bi-level images or overlays. It also provides the required run-length code tables for use in Secondary Imagery Dissemination Systems (SIDS) complying with NITFS.

This standard is applicable to the Intelligence Community and the Department of Defense. It is mandatory for all Secondary Imagery Dissemination Systems in accordance with the memorandum by the Assistant Secretary of Defense for Command, Control, Communications, and Intelligence ASD(C3I) Subject: National Imagery Transmission Format Standard (NITFS), 12 August 1991. This standard shall be implemented in accordance with the JIEO Circular 9008 and the MIL-HDBK-1300. New equipment and systems, those undergoing major modification, or those capable of rehabilitation shall conform to this standard.

The minimum compliance requirements for implementation of this compression algorithm are defined in JIEO Circular 9008.

This standard establishes the requirements for the communication or interchange of image Data in compressed form. The bi-level compression standard may be operated in one of three modes:

a. mode 1 - one-dimensional coding.

b. mode 2 - two-dimensional coding with standard vertical resolution, K = 2.

c. mode 3 - two-dimensional coding with higher vertical resolution, K = 4 (see

The corresponding modes are specified by 1D, 2DS, and 2DH, respectively, in the Compression Rate Code field of the National Imagery Transmission Format (NITF) file image subheader.