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interimage:attributes_description [2010/06/23 17:57] rsilva |
interimage:attributes_description [2010/06/29 10:32] rsilva |
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| {{ :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. | ||
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| ===== Spectral Statistical Attributes ===== | ===== 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 **O** for the given image layer **L**. |
| - | * **Brightness** - | + | * **Brightness** - |
| * **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: | * **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: | ||
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| * **SumPixelsValues** - Represents the sum of all element values inside an area for one given image band/channel. | * **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 }} | {{ interimage:att_variance.gif }} | ||
