Context-free attentional operators: the generalized symmetry transform
International Journal of Computer Vision - Special issue on qualitative vision
Automatic gait recognition by symmetry analysis
Pattern Recognition Letters - Special issue: Audio- and video-based biometric person authentication (AVBPA 2001)
Symmetric polarity in generalized symmetry transformation
Pattern Recognition Letters
A Real Time Fingers Detection by Symmetry Transform Using a Two Cameras System
ISVC '08 Proceedings of the 4th International Symposium on Advances in Visual Computing, Part II
Multi-stage combination of geometric and colorimetric detectors for eyes localization
ICIAP'05 Proceedings of the 13th international conference on Image Analysis and Processing
Real-Time Speed Sign Detection Using the Radial Symmetry Detector
IEEE Transactions on Intelligent Transportation Systems
Real-time traffic sign detection with vehicle camera images
Proceedings of the 7th International Conference on Ubiquitous Information Management and Communication
Proceedings of the 8th International Conference on Ubiquitous Information Management and Communication
Proceedings of the 8th International Conference on Ubiquitous Information Management and Communication
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We present a real-time approach for circular and polygonal road signs detection in still images, regardless of their pose and orientation. Object detection is done using a pairwise gradient-based symmetry transform able to detect circles and polygons indistinctly. This symmetry transform of gradient orientation, the so-called Bilateral Chinese Transform BCT, decomposes an object into a set of parallel contours with opposite gradients, and models this gradient field symmetry using an accumulation of radial symmetry evidences. On a test database of 89 images 640x480 containing 92 road signs, 79 are correctly detected (86%) with 25 false positives using the BCT approach in about 30 ms/image.