MIL-HDBK-1300A
bit data. The composite mode compresses areas of low interest more than areas of high interest. Decompression is identical for all three modes. More details on this specific algorithm may be found in MIL-STD-188-197A.
FIGURE 6. ARIDPCM encoder.
FIGURE 7. ARIDPCM decoder.
5.5.1.3 JPEG. Joint Photographic Experts Group (JPEG) image compression is a compression algorithm that compresses 8- and 12-bit gray scale and 24-bit color image data. The MIL-STD-188-
198A specifies the portions of the JPEG standard in ISO Draft IS 10918-1/CCITT Draft Recommendation T.81 implemented in NITFS. JPEG provides greater compression than the ARIDPCM with similar image quality. Two classes of JPEG are lossless and lossy compression. Four distinct modes of operation defining the coding processes are sequential DCT-based, progressive DCT- based, lossless, and hierarchical. The NITFS specifies only the sequential DCT-based mode using Huffman encoding. Figures 8 and 9 show the general compression and decompression with this algorithm. The amount of compression provided by any process depends on the characteristics of the image being compressed, as well as the picture quality desired by the application. More details on this specific algorithm may be found in MIL-STD-188-198A.
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