Coding of Multilevel Graphics

Thomas S. Huang, Hans U. Koller

Research output: Contribution to journalArticlepeer-review


In this paper we consider the digitization and coding of graphics, specifically typewritten letters, and make two contributions. The first contribution concerns the tradeoff between resolution and number of gray levels. We carried out subjective tests which showed that, in order to get better image quality at a given bit rate, for good-quality originals, one should use only two levels/sample and higher resolution; while for poor-quality originals, one should use more levels/sample. Second, we estimated the bit rates achievable when bit-plane run length coding is applied to the multilevel images.

Original languageEnglish (US)
Pages (from-to)598-606
Number of pages9
JournalIEEE Transactions on Communications
Issue number6
StatePublished - Jun 1975
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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