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Proceedings Paper

Optical Processing Methods Of Image Information Compression ---A Research Of The ODPCM Method
Author(s): Lin Ning; Wu Changfa; Ye Jiaxiong
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Paper Abstract

The differential pulse code modulation (DPCM)1) method is a kind of digital processing methods of the image information compression. A digital DPCM compression system consists of a time feedback loop and a predictor. Its salient points can be summarized in the following three properties: 1) after prediction and difference steps, the low-frequency information of the image removed, and it may be recreated in the reconstruction process by the predictor; 2) if the prediction is accurate, the difference will be much smaller than the incoming data, also, the coding bits must be much less; 3) the DPCM process is causal.Simulating the digital processing with optical methods, much work has been done, e.g., interpolated DPCM (IDPCM) 2), which showed theoretically that an optical interpolator could be used to replace the linear predictor in the DPCM and an incoherent optical processing systme replace the time feedback system. However, the IDPCM method concerned only with the digital simulation of the DPCM, on any real optical compression processing system has been reported until now. In this paper, we propose and design a practical optical system of image information compression based on the IDPCM theory. A complete optical system of the DPCM was first realized in our laboratory. A series of experiments of image compression processing, in which a binary image is taken as the input, have been done in the ODPCM system and their results show the feasibility of the ODPCM method.

Paper Details

Date Published: 1 January 1987
PDF: 2 pages
Proc. SPIE 0813, Optics and the Information Age, (1 January 1987); doi: 10.1117/12.967259
Show Author Affiliations
Lin Ning, Huazhong University of Science and Technology (China)
Wu Changfa, Huazhong University of Science and Technology (China)
Ye Jiaxiong, Huazhong University of Science and Technology (China)


Published in SPIE Proceedings Vol. 0813:
Optics and the Information Age

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