Scalable resolution transformation by outlining with approximated B-spline curve

Eiichi Sakaue; Naofumi Yamamoto; Hidekazu Sekizawa

doi:10.1117/12.302438

1 April 1998 Scalable resolution transformation by outlining with approximated B-spline curve

Eiichi Sakaue, Naofumi Yamamoto, Hidekazu Sekizawa

Proceedings Volume 3308, Very High Resolution and Quality Imaging III; (1998) https://doi.org/10.1117/12.302438
Event: Photonics West '98 Electronic Imaging, 1998, San Jose, CA, United States

Abstract

This paper presents a developed resolution transformation method which achieves scaleable resolution transformation of bi-level images with high image quality, real-time processing and small circuitry. The progress of networked multi- functional hard-copy products for printing images from various sources such as facsimile machines, PCs, scanners and digital cameras, which have various resolutions, has created an urgent need for scaleable resolution transformation with high image quality. The proposed method applies outlining and rendering to scaleable resolution transformation. Furthermore, it minimizes the size of the circuitry by modifying their algorithms. Outlines are generated from the bi-level bit map of the source image by fitting approximated B-spline curve upon edge pixels. The bi-level bit map image which has a different resolution is generated from the outlines with local rendering. Curve fitting of approximated B-spline curve and local rendering makes it possible to reduce the circuitry. As a result, real-time scaleable resolution transformation of high quality is achieved with small circuitry. The quality of images transformed from 200 dpi to 600 dpi by the proposed method is almost equivalent to a genuine 600 dpi image.

Citation Download Citation

Eiichi Sakaue, Naofumi Yamamoto, and Hidekazu Sekizawa "Scalable resolution transformation by outlining with approximated B-spline curve", Proc. SPIE 3308, Very High Resolution and Quality Imaging III, (1 April 1998); https://doi.org/10.1117/12.302438

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KEYWORDS

Image resolution

Image quality

Image processing

Printing

Digital cameras

Imaging devices

Picosecond phenomena

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