MIL-PRF-89041 Controlled Image Base \(Cib\)This specification provides requirements for the preparation and use of the Raster Product Format \(RPF\) Controlled Image Base \(CIB\) data. CIB is a dataset of orthophotos, made from rectified grayscale aerial images. CIB supports various weapons, C3I theater battle management, mission planning, digital moving map, terrain analysis, simulation, and intelligence systems. CIB data are produced from digital source images that can be converted to meet the requirements of this CIB specification at one of the registered resolutions defined in MIL-STD-2411-1. CIB data are derived directly from digital images and are compressed and reformatted to conform to the RPF Standard. CIB files are physically formatted within a National Imagery Transmission Format \(NITF\) message.

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MIL-PRF-89041A

collection parameters (e.g., gain values set differently, images

collected on different dates.) Processing of the source imagery

into CIB will include a brightness and/or contrast adjustment in

order to minimize such differences; however, it typically will

not be possible to eliminate all visual differences between

mosaiced images. CIB image data from adjacent frames abut

exactly to provide unbroken coverage. However, gaps in coverage

may occur as a result of incomplete source image data. In the

case where source imagery is extremely dark or light (e.g.,

contains features that are unrecognizable), data will be enhanced

such that contrast will be heightened over large areas and

features are recognizable without further enhancement by the

user. No artificial seams (i.e., along geocell or frame

boundaries) will be introduced to data during processing from

source to final CIB product except in the case along the degree

boundary where adequate DTED is not available for the adjacent

cell. At a minimum, CIB producers should present its approach to

both radiometric balancing and contrast enhancement for review

before production begins.

3.4.5 Data file organization. CIB data files are arranged

in a hierarchical directory/subdirectory structure (see FIGURE

1). The CIB directories and data file, enumerated below, are

fully described in 3.12 and 3.13. All names and labels, and the

format and structure of directories shall adhere to the

conventions specified in MIL-STD-2411.

RPF Directory

(Optional)

[frame file

[table of

sub-level

directory]s

contents file]

[frame file

directory]

more ...

[overview

[frame file]s

image]s

[frame file]s

(Optional)

FIGURE 1.

CIB Directory/File Structure.

a. CIB "root" Directory: Contains [table of contents

file], one or more directories of [frame file]s and one or more

[overview image]. The root directory shall be named "RPF".