Paper:

# Parallel Computation of the Region-Based Level Set Method for Boundary Detection of Moving Objects

## Xianfeng Fei^{*,**}, Yasunobu Igarashi^{***}, Makoto Shinkai^{****},

Masatoshi Ishikawa^{*****}, and Koichi Hashimoto^{*}

^{*}Graduate School of Information Science, Tohoku University, 6-6-01 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8579, Japan

^{**}Electrical Engineering College, Guizhou University, Nanming, Guiyang, Guizhou 550003, China

^{***}Graduate School of Information Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan

^{****}Corporate Research and Development Group, Sharp Corporation, 1-9-2 Nakase, Mihama-ku, Chiba 261-8520, Japan

^{*****}Graduate School of Information Science and Technology, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

We formulate a parallel, region-based level set model to speed up accurate boundary detection of moving objects in low-contrast images, applying parallelization and discretization to a Chan-Vese (CV) model. We implement the model in a column parallel vision (CPV) system that is one of parallel image processing systems we developed for robot vision. Using a microscopic image of moving paramecia as a sample of a low-contrast image, our model detects moving paramecia boundaries within 2 ms per image. Comparisons of our model to a CV model using the CPV system and a nonparallel PC, we found that our model cuts calculation time for a CV model while obtaining accuracy similar to the CV model in boundary detection of moving objects.

Masatoshi Ishikawa, and Koichi Hashimoto, “Parallel Computation of the Region-Based Level Set Method for Boundary Detection of Moving Objects,”

*J. Robot. Mechatron.*, Vol.21, No.6, pp. 698-708, 2009.

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