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008250807e19941212bccad   obt  f000 0 eng d
040 |aCaOODSP|beng|erda|cCaOODSP
043 |an-cn---
0861 |aDR52-11/22-1994E-PDF
1001 |aHeard, Garry John, |d1955- |eauthor.
24510|aBlock truncation compression of sonar images / |cGarry J. Heard.
264 1|aVictoria, B.C. : |bDefence Research Establishment Pacific = Centre de recherches pour la défense pacifique : |bResearch and Development Branch, Department of National Defence, |cDecember 12, 1994.
300 |a1 online resource (12 pages, 10 unnumbered pages) : |billustrations, chart.
336 |atext|btxt|2rdacontent
337 |acomputer|bc|2rdamedia
338 |aonline resource|bcr|2rdacarrier
4901 |aTechnical memorandum ; |v94-146
500 |aDigitized edition from print [produced by Defence Research and Development Canada].
504 |aIncludes bibliographical references (page 12).
5203 |a"This paper describes the Block Truncation Compression algorithm and applies it to the problem of storing sonar lofargram and frequency-azimuth (FRAZ) images. Four simulation test cases are presented that demonstrate the algorithm's capabilities, and two real data examples are shown that illustrate the use of the method with actual lofargram and FRAZ images. Only qualitative comparisons of the original and restored images are given, as the technique greatly changes the picture details, but maintains the original image's appearance. This compression algorithm has desirable features such as data independence, minimal computation, and fixed compress/decompress processing times that suit it ideally to real-time applications. Compression ratios of 4:1 are achieved with the basic implementation of the algorithm"--Abstract (page 1).
650 0|aSonar|xMilitary applications|zCanada.
650 0|aData compression (Computer science)
650 6|aSonar|xApplications militaires|zCanada.
650 6|aDonnées--Compression (Informatique)
7102 |aDefence Research Establishment Pacific, |eissuing body.
7101 |aCanada. |bDepartment of National Defence. |bResearch and Development Branch, |eissuing body.
830#0|aTechnical memorandum (Defence Research Establishment Pacific)|v94-146.|w(CaOODSP)9.936067
85640|qPDF|s1.61 MB|uhttps://publications.gc.ca/collections/collection_2025/rddc-drdc/DR52-11-22-1994-eng.pdf