Diferenças

Aqui você vê as diferenças entre duas revisões dessa página.

--- interimage:attributes_description [2010/06/23 20:32] – hermann
+++ interimage:attributes_description [2012/07/17 23:47] (atual) – rsilva
@@ Linha 30: / Linha 30: @@
   * **yGeoCenter** - y geo-coordinate of the object centroid.
   * **membership** or **p** - confidence in the object with regard to its classification.
 ===== Shape Attributes =====
-  * **area**: Returns the area of the given polygon, in number of pixels.
+  * **area** - Returns the real area of the given polygon.
-  * **bBoxArea**: Returns the bounding box area of the given polygon, in number of pixels.
+  * **bBoxArea** - Returns the real bounding box area of the given polygon.
-  * **perimeter**: Returns the perimeter of the polygon, considering the amount of pixels in its border.
+  * **perimeter** - Returns the real perimeter of the given polygon.
-  * **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 }}
 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 }}
 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 biggest 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 biggest 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 t closest 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 t closest 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 }}
 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 }}
 Where P is the polygon perimeter and A is the area.
@@ Linha 67: / Linha 68: @@
 ===== Spectral Statistical Attributes =====
-  * **Amplitude** - represents the difference between the maximum and minimum pixel values of a region for the given image band/channel.
+  * **Amplitude** - represents the difference between the maximum and minimum pixel values of an object for the given image layer **L**.
-  * **Brightness** -
+  * **Brightness** - represents the brightness of an image object.
   * **Correlation** - Correlation is a similarity measure between two data sets under an absolute scale between [-1,1]. It is calculated as shown by the next formula:
@@ Linha 93: / Linha 94: @@
-  * **Ratio** -
+  * **Ratio** - represents the amount that layer **L** contributes to the total brightness of an image object.
   * **StdDeviation** - The standard deviation represents the numerical data dispersion degree surrounding the mean. It is defined by:
@@ Linha 100: / Linha 101: @@
   * **SumPixelsValues** - Represents the sum of all element values inside an area for one given image band/channel.
-a  * **Variance** - Like the standard deviation, the variance also represents the numerical data dispersion degree surrounding the mean but in the original data value scale. It is defined by:
+  * **Variance** - Like the standard deviation, the variance also represents the numerical data dispersion degree surrounding the mean but in the original data value scale. It is defined by:
 {{ interimage:att_variance.gif }}