Shape Matching and Object Recognition Using Shape Contexts
IEEE Transactions on Pattern Analysis and Machine Intelligence
Reduced-search dynamic programming for approximation of polygonal curves
Pattern Recognition Letters
Distinctive Image Features from Scale-Invariant Keypoints
International Journal of Computer Vision
Sketched Symbol Recognition using Zernike Moments
ICPR '04 Proceedings of the Pattern Recognition, 17th International Conference on (ICPR'04) Volume 1 - Volume 01
Curvature Scale Space Corner Detector with Adaptive Threshold and Dynamic Region of Support
ICPR '04 Proceedings of the Pattern Recognition, 17th International Conference on (ICPR'04) Volume 2 - Volume 02
Image reconstruction from a complete set of similarity invariants extracted from complex moments
Pattern Recognition Letters
Speeded-Up Robust Features (SURF)
Computer Vision and Image Understanding
Blurred Shape Model for binary and grey-level symbol recognition
Pattern Recognition Letters
Recognizing Planar Symbols with Severe Perspective Deformation
IEEE Transactions on Pattern Analysis and Machine Intelligence
PCA-SIFT: a more distinctive representation for local image descriptors
CVPR'04 Proceedings of the 2004 IEEE computer society conference on Computer vision and pattern recognition
Pattern Recognition Letters
Shape matching and classification using height functions
Pattern Recognition Letters
Dynamic time warping of cyclic strings for shape matching
ICAPR'05 Proceedings of the Third international conference on Pattern Recognition and Image Analysis - Volume Part II
Report on the second symbol recognition contest
GREC'05 Proceedings of the 6th international conference on Graphics Recognition: ten Years Review and Future Perspectives
Circular Blurred Shape Model for Multiclass Symbol Recognition
IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics
Robustness of shape similarity retrieval under affine transformation
IM'99 Proceedings of the 1999 international conference on Challenge of Image Retrieval
Robust line matching through line-point invariants
Pattern Recognition
Affine-invariant, elastic shape analysis of planar contours
CVPR '12 Proceedings of the 2012 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
On the dynamic time warping of cyclic sequences for shape retrieval
Image and Vision Computing
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Great attention has been devoted to the development of shape descriptors that is the key to object recognition. Previous works have great success on either relatively simple symbols or limited transformations, e.g., translation, rotation and scaling. We propose a new affine invariant, named characteristic ratio (CHAR) that includes more points for complex symbols with rich inner structures. Moreover, we build a novel shape descriptor with CHAR values calculated on collinear points that cover the convex hull of a shape. Dynamic Time Warping algorithm is employed to compare the similarity of spectrum. The performance of the proposed descriptor is validated by the experiments compared with the classical SIFT descriptor, Shape Context (SC), recently developed Cross Ratio Spectrum (CRS) and Circular Blurred Shape Model (CBSM) on three kinds of symbols, i.e., alphanumeric characters, television networks logos and traffic signs with a wide range of transformations (2016 images in total). The results indicate a high recognition rate to severe affine deformations, and a good discriminating ability to similar symbols. We also perform the experiments on the GREC database corrupted by noise with different degrees, showing the robustness of our descriptor to noise.