Extract zero-crossings in a single-pass filtering

Jesse S. Jin; Baowen Chen

doi:10.1117/12.270344

3 April 1997 Extract zero-crossings in a single-pass filtering

Jesse S. Jin, Baowen Chen

Proceedings Volume 3028, Real-Time Imaging II; (1997) https://doi.org/10.1117/12.270344
Event: Electronic Imaging '97, 1997, San Jose, CA, United States

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.

Citation Download Citation

Jesse S. Jin and Baowen Chen "Extract zero-crossings in a single-pass filtering", Proc. SPIE 3028, Real-Time Imaging II, (3 April 1997); https://doi.org/10.1117/12.270344

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