On the Detection of the Axes of Symmetry of Symmetric and Almost Symmetric Planar Images
IEEE Transactions on Pattern Analysis and Machine Intelligence
Detection of generalized principal axes is rotationally symmetric shapes
Pattern Recognition
Detecting number of folds by a simple mathematical property
Pattern Recognition Letters
Machine vision
Generalized Affine Invariant Image Normalization
IEEE Transactions on Pattern Analysis and Machine Intelligence
Symmetry Detection by Generalized Complex (GC) Moments: A Close-Form Solution
IEEE Transactions on Pattern Analysis and Machine Intelligence
Robust Rotation Angle Estimator
IEEE Transactions on Pattern Analysis and Machine Intelligence
Digital approximation of moments of convex regions
Graphical Models and Image Processing
Robot Vision
Robust normalization of silhouettes for recognition applications
Pattern Recognition Letters - Special issue: Discrete geometry for computer imagery (DGCI'2002)
Finding axes of symmetry from potential fields
IEEE Transactions on Image Processing
Measuring Elongation from Shape Boundary
Journal of Mathematical Imaging and Vision
Boundary based shape orientation
Pattern Recognition
Boundary based shape orientation
Pattern Recognition
New Measure for Shape Elongation
IbPRIA '07 Proceedings of the 3rd Iberian conference on Pattern Recognition and Image Analysis, Part II
Measuring the Related Properties of Linearity and Elongation of Point Sets
CIARP '08 Proceedings of the 13th Iberoamerican congress on Pattern Recognition: Progress in Pattern Recognition, Image Analysis and Applications
An Alternative Approach to Computing Shape Orientation with an Application to Compound Shapes
International Journal of Computer Vision
A unifying approach to moment-based shape orientation and symmetry classification
IEEE Transactions on Image Processing
Measuring the orientability of shapes
CAIP'07 Proceedings of the 12th international conference on Computer analysis of images and patterns
A definition for orientation for multiple component shapes
CAIP'07 Proceedings of the 12th international conference on Computer analysis of images and patterns
Curvature weighted gradient based shape orientation
Pattern Recognition
Shape elongation from optimal encasing rectangles
Computers & Mathematics with Applications
Invariant representative cocycles of cohomology generators using irregular graph pyramids
Computer Vision and Image Understanding
Orientation and anisotropy of multi-component shapes from boundary information
Pattern Recognition
CAIP'11 Proceedings of the 14th international conference on Computer analysis of images and patterns - Volume Part I
Boundary based orientation of polygonal shapes
PSIVT'06 Proceedings of the First Pacific Rim conference on Advances in Image and Video Technology
Shape ellipticity based on the first Hu moment invariant
Information Processing Letters
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In this paper we consider some questions related to the orientation of shapes with particular attention to the situation where the standard method does not work. There are irregular and non-symmetric shapes whose orientation cannot be computed in a standard way, but in the literature the most studied situations are those where the shape under consideration has more than two axes of symmetry or where it is an n-fold rotationally symmetric shape with n2. The basic reference for our work is [W.H. Tsai, S.L. Chou, Detection of generalized principal in rotationally symmetric shapes, Pattern Recognition 24 (1991) 95-104]. We give a very simple proof of the main result from [W.H. Tsai, S.L. Chou, Detection of generalized principal in rotationally symmetric shapes, Pattern Recognition 24 (1991) 95-104] and suggest a modification of the proposal on how the principal axes of rotationally symmetric shapes should be computed. We show some desirable property in defining the orientation of such shapes if the modified approach is applied. Also, we give some comments on the problems that arise when computing shape elongation.