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Proceedings Paper

Coprocessor for a graphic workstation: a proposal for line-drawing applications
Author(s): Giancarlo Cutrignelli; Vincenzo Di Lecce; Andrea Guerriero
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Paper Abstract

Resizing techniques are commonly used in graphic applications and window environments to change image size and adapt it to the video resolution. Different algorithms have been proposed to perform image reduction with different effects on the image content. In this paper we present a proposal for a graphic coprocessor, based on TMS320C80, optimized for line drawing low-loss reduction and suitable for VDT presentations. Based on DCT and local thresholding, the algorithm is characterized by fine granularity, task independence and consequently good matching with parallel processing. In the proposed system, the line drawing is spilt into 32*32 pixels windows. In order to perform the image reduction, each window is subject to DCT computation and inverse transformation of the only low-frequency coefficients. The reduced image is thresholded to a value function of the black pixel percentage in the original image and the reduction ratio. The coprocessor is able to reduce an A0 line drawing acquired at 300 dpi in less than 0.2 seconds, by a reduction ratio f 1/32, producing good information preservation in the new image suitable for VDT presentation.

Paper Details

Date Published: 26 March 1998
PDF: 9 pages
Proc. SPIE 3311, Multimedia Hardware Architectures 1998, (26 March 1998); doi: 10.1117/12.304674
Show Author Affiliations
Giancarlo Cutrignelli, Politecnico di Bari (Italy)
Vincenzo Di Lecce, Politecnico di Bari (Italy)
Andrea Guerriero, Politecnico di Bari (Italy)


Published in SPIE Proceedings Vol. 3311:
Multimedia Hardware Architectures 1998
Sethuraman Panchanathan; Frans Sijstermans; Subramania I. Sudharsanan, Editor(s)

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