Error Reduction In Computer-Generated Half-Tone Transparencies That Are Based On Pulse-Width Modulation

Martin J Bastiaans

doi:10.1117/12.941622

6 October 1987 Error Reduction In Computer-Generated Half-Tone Transparencies That Are Based On Pulse-Width Modulation

Martin J Bastiaans

Proceedings Volume 0812, Progress in Holography; (1987) https://doi.org/10.1117/12.941622
Event: Fourth International Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, The Hague, Netherlands

Abstract

The paper deals with the synthesis of band-limited functions that are generated by properly low-pass filtering a sequence of equally-spaced width-modulated unit-height pulses; simply choosing the pulse widths proportional to the corresponding sample values of the band-limited function to be generated, would result in an error. The exact relationship between the pulse widths and the corresponding sample values of the band-limited function to be synthesized, is derived. Error reduction can be achieved by using this relationship to calculate the pulse widths from the required sample values; in principle, a band-limited function can thus be realised to any degree of accuracy. It is shown which amount of error reduction can be obtained, when only a limited number of terms of the exact relationship is taken into account. The application to computer-generated half-tone transparencies is described.

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Martin J Bastiaans "Error Reduction In Computer-Generated Half-Tone Transparencies That Are Based On Pulse-Width Modulation", Proc. SPIE 0812, Progress in Holography, (6 October 1987); https://doi.org/10.1117/12.941622

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KEYWORDS

Transparency

Complex systems

Fourier transforms

Holography

Error analysis

Linear filtering

Modulation

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