From: SHERPA: an image segmentation and outline feature extraction tool for diatoms and other objects
Name of feature | Description |
---|---|
Source Image | Path to raw image data file |
Area | Object area |
Perimeter | Object perimeter |
Width | Object width (along major axis) |
Height | Object height (perpendicular to major axis) |
Rotation Angle | Rotation angle of the major axis |
Segmentation Method | Segmentation method used to derive the object shape |
Optimization Method | Optimization method applied to the object shape |
Best Template (EFDIs) | Path to the best matching template (according to matching of elliptic Fourier descriptor invariants) |
Template Difference (EFDIs) | Value for matching of elliptic Fourier descriptor invariants between object and best matching template |
Hu-match for best EFDIs-Template | Value of matching of Hu invariants between object shape and best matching template |
Standard Deviation | Standard deviation of texture gray levels within the inner 50% of the object boundaries |
Width/Height-Ratio | Aspect ratio of the object shape |
Smoothed Perimeter Ratio | Ratio between the perimeters of the smoothed and the original contour; smoothing is performed by Gaussian filtering of the contour coordinates. |
Quality Index | Number of fulfilled quality indicators |
Template is convex | Indicator showing if the best matching template is convex |
Convexity is used | Indicator showing if convexity was judged directly to calculate convexity indicators (use of absolute convexity measures) |
Rectangularity | Heuristic descriptor |
Compactness | Heuristic descriptor |
Ellipticity | Heuristic descriptor |
Triangularity | Heuristic descriptor |
Roundness | Heuristic descriptor |
Convexity by perimeter | Heuristic descriptor |
Convexity by area | Heuristic descriptor |
Formfactor | Heuristic descriptor |
CDF | Convexity defect measure |
PCAF | Convexity defect measure |
CHMDF | Convexity defect measure |
CDF-Match | Ratio of CDF between object and template |
PCAF-Match | Ratio of PCAF between object and template |
Compactness-Match | Ratio of heuristic descriptor "formfactor" between object and template |
Convexity Defect Index | Number of fulfilled absolute or relative convexity indicators |
Ranking Index | Ranking for object shape, i.e. estimation of quality and relevance of result |
Contour Image | Name of the file containing the image data cropped to the object area |
Contour Image top left Corner | Coordinates of the top left corner of the cropped object image with respect to the raw data |
Image Moments (mu) | Image moments of the object shape |
Hu Invariants (Hu) | Hu-Invariants of the object shape |