Optical computations of cosine transforms

Zu Han Gu, James R. Leger, Sing H. Lee

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Utilizing the symmetrical properties of cosine transform, a coherent optical Fourier transform system has been modified to compute cosine transforms optically. The modification involves creating a symmetrical pattern at the input. Cosine transform is known to be useful for data compression and image coding especially when the image space-bandwidth product is finite. It is also attractive even when the image size becomes large but is not statistically stationary; in such case it should be processed in (M × M) stationary blocks of finite size.

Original languageEnglish (US)
Pages (from-to)137-142
Number of pages6
JournalOptics Communications
Issue number3
StatePublished - Oct 1 1981


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