Research Article
New Morphological Features for Grading Pancreatic Ductal Adenocarcinomas
Table 1
List of notations.
| | Symbol | Description |
| | p | The is a pair of numbers that are and coordinates p = (x, y) | | A | The matrix representation for preprocessed binary image | | H(A) | The direction cumulative histogram for A | | (A) | The thresholded H(A) | | A sequence of points that consist of the original lumen boundary | | A sequence of points for the convex hull of | | A sequence of points for the ideal lumen boundary that is estimated from | | A set of nuclei , ,…, | | A set of epithelial nuclei | | A set of nonepithelial nuclei | | Distance(·,·) | The Euclidean distance function | | Centroid(·) | The function returning center point of given object | | A(t) | The atypia-amplitude function | | L(t) | The perimeter from (start point) to (tth point) | | A set of atypia regions ar1, ar2,…, | | The region surrounded by | | The region surrounded by | | The region surrounded by | | Area (·) | The function returning area of given region | | (·) | The data set for given feature set (·) = {(x 1(·),), …, ((·),)}, x(·) is feature vector for given feature set and is class label for x(·) |
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