Optical computations of cosine transforms

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

doi:10.1016/0030-4018(81)90042-0

Optical computations of cosine transforms

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

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

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 language	English (US)
Pages (from-to)	137-142
Number of pages	6
Journal	Optics Communications
Volume	39
Issue number	3
DOIs	https://doi.org/10.1016/0030-4018(81)90042-0
State	Published - Oct 1 1981

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title = "Optical computations of cosine transforms",

abstract = "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.",

author = "Gu, {Zu Han} and Leger, {James R.} and Lee, {Sing H.}",

year = "1981",

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AU - Lee, Sing H.

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N2 - 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.

AB - 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.

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Optical computations of cosine transforms

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