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interimage:attributes_description [2010/06/23 15:23] rsilva |
interimage:attributes_description [2010/06/23 16:44] tkorting |
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| ===== Shape Attributes ===== | ===== Shape Attributes ===== | ||
| - | * area: Returns the area of the given polygon, in number of pixels. | + | * **area**: Returns the area of the given polygon, in number of pixels. |
| - | * bBoxArea: Returns the bounding box area of the given polygon, in number of pixels. | + | * **bBoxArea**: Returns the bounding box area of the given polygon, in number of pixels. |
| - | * perimeter: Returns the perimeter of the polygon, considering the amount of pixels in its border. | + | * **perimeter**: Returns the perimeter of the polygon, considering the amount of pixels in its border. |
| - | * fractalDimension: Returns the fractal dimension of a given polygon, which is calculated by the following equation: | + | * **fractalDimension**: Returns the fractal dimension of a given polygon, which is calculated by the following equation: |
| {{ :interimage:fractal.png }} | {{ :interimage:fractal.png }} | ||
| Where P is the polygon perimeter and A is the area. | Where P is the polygon perimeter and A is the area. | ||
| - | * perimeterAreaRatio: Calculates the ratio between the perimeter and the area of a polygon. | + | * **perimeterAreaRatio**: Calculates the ratio between the perimeter and the area of a polygon. |
| - | * compacity: Returns the compacity of a given polygon, which is calculated by the following equation: | + | * **compacity**: Returns the compacity of a given polygon, which is calculated by the following equation: |
| {{ :interimage:compacity.png }} | {{ :interimage:compacity.png }} | ||
| Where P is the polygon perimeter and A is the area. | Where P is the polygon perimeter and A is the area. | ||
| - | * density: The density of a polygon is calculated by the ratio between its area and its Radius (the maximum distance between the polygon centroid and all its vertices). | + | * **density**: The density of a polygon is calculated by the ratio between its area and its Radius (the maximum distance between the polygon centroid and all its vertices). |
| - | * length: The Length of a polygon is the height of its bounding box. | + | * **length**: The Length of a polygon is the height of its bounding box. |
| - | * width: The Width of a polygon is calculated by the width of its bounding box. | + | * **width**: The Width of a polygon is calculated by the width of its bounding box. |
| - | * contiguity: Contiguity index assesses the spatial connectedness of pixels within a polygon to provide an index of boundary configuration. | + | * **contiguity**: Contiguity index assesses the spatial connectedness of pixels within a polygon to provide an index of boundary configuration. |
| - | * gyrationRadius: This attribute equals the mean distance between each pixel in the polygon and the polygon centroid. | + | * **gyrationRadius**: This attribute equals the mean distance between each pixel in the polygon and the polygon centroid. |
| - | * angle: The main angle of a polygon. It is obtained by calculating the best elliptic fit, and the angle of the bigest radius of the ellipse corresponds to the polygon angle. | + | * **angle**: The main angle of a polygon. It is obtained by calculating the best elliptic fit, and the angle of the bigest radius of the ellipse corresponds to the polygon angle. |
| - | * ellipticFit: Finds the best ellipse which fits outside the polygon and returns the ratio between the polygon area and the ellipse area. | + | * **ellipticFit**: Finds the best ellipse which fits outside the polygon and returns the ratio between the polygon area and the ellipse area. |
| - | * squareness: This attribute fits the minimum rectangle outside the polygon and calculates the ratio between the polygon area and the area of this rectangle. The most close to 1 is this attribute, the most similar to a rectangle the polygon is. | + | * **squareness**: This attribute fits the minimum rectangle outside the polygon and calculates the ratio between the polygon area and the area of this rectangle. The most close to 1 is this attribute, the most similar to a rectangle the polygon is. |
| - | * circleness: It is calculated by the following equation: | + | * **circleness**: It is calculated by the following equation: |
| {{ :interimage:circle.png }} | {{ :interimage:circle.png }} | ||
| Where A is the polygon area and R is the maximum distance between the polygon centroid and all its vertices. | Where A is the polygon area and R is the maximum distance between the polygon centroid and all its vertices. | ||
| - | * shapeIndex: Returns the shape index of a given polygon, which is calculated by the following equation: | + | * **shapeIndex**: Returns the shape index of a given polygon, which is calculated by the following equation: |
| {{ :interimage:shapeindex.png }} | {{ :interimage:shapeindex.png }} | ||
| Where P is the polygon perimeter and A is the area. | Where P is the polygon perimeter and A is the area. | ||
| Line 161: | Line 161: | ||
| * **meanDiffToNeighbors** - mean difference of the layer **L** mean value of an image object to the layer **L** mean value of direct neighbors (**R**=0) or all neighbor objects inside the range **R** (**R**>0). The differences are weighted with regard to the shared border (**R**=0) or the area covered by the neighbor objects inside the range (**R**>0). The distance between the image object and its neighbors is calculated considering their centroids. | * **meanDiffToNeighbors** - mean difference of the layer **L** mean value of an image object to the layer **L** mean value of direct neighbors (**R**=0) or all neighbor objects inside the range **R** (**R**>0). The differences are weighted with regard to the shared border (**R**=0) or the area covered by the neighbor objects inside the range (**R**>0). The distance between the image object and its neighbors is calculated considering their centroids. | ||
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