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Proceedings Paper

Extract zero-crossings in a single-pass filtering
Author(s): Jesse S. Jin; Baowen Chen
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Paper Abstract

Zero-crossings extracted from LoG filtering are widely used for pattern recognition and computer vision. Recursive filtering techniques have been applied to reduce the computational complexity of LoG filtering. However, extracting zero-crossings remains a time-consuming task and usually requires a second scanning process after filtering. This paper presents an algorithm using a line buffer to extract zero-crossings along with LoG filtering hence avoiding the need for an additional convolution and extra memory units. Because we know where the sign of two pixels crosses zero, the exact location of each zero-crossing can be calculated down to sub-pixel level by linear interpolation. The line buffer can be implemented easily in hardware, and real-time processing can be achieved.

Paper Details

Date Published: 3 April 1997
PDF: 12 pages
Proc. SPIE 3028, Real-Time Imaging II, (3 April 1997); doi: 10.1117/12.270344
Show Author Affiliations
Jesse S. Jin, Univ. of New South Wales (Australia)
Baowen Chen, Chinese Academy of Sciences (China)

Published in SPIE Proceedings Vol. 3028:
Real-Time Imaging II
Divyendu Sinha, Editor(s)

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