Detecting objects by using DCT coefficients analysis

Michio Miwa, Quang Huy Viet Huynh, Masahiro Ishii, Yasuharu Koike, Makoto Sato

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The depth information of objects is important for retrieving and indexing image information. A method is described for finding the depth of objects by taking three pictures, each with a different focus. One picture is focused at the target position, one is focused near the target, and the last one is far from it. DCT coefficients are used to estimate how each picture is focused. By comparing the sum of the frequency coefficients of these pictures, we can determine whether an object is in the target position or not.

Original languageEnglish
Pages (from-to)252-259
Number of pages8
JournalKyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers
Issue number2
Publication statusPublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • Media Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering


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