Diferenças

Aqui você vê as diferenças entre duas revisões dessa página.

--- interimage:attributes_description [2010/06/23 20:57] – rsilva
+++ 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:
 {{ :interimage:fractal.png }}
@@ Linha 58: / Linha 60: @@
  {{ :interimage:shapeindex.png }}
 Where P is the polygon perimeter and A is the area.
 ===== 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 87: / 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 94: / 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 }}