Control points Automatic Generation
The Control Points Automatic Generation, assists mainly in Image Registration. This operation find automatically pair of points of two images,
but to find the control points, is necessary that the two images has intersection and the same physics features, in other words, to find the control points
between a LANDSAT and CBERS image, the bands must be compatible (has the same frequency band).
Control points Automatically Generating:
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click on item Control points Automatic Generation... of Image menu.
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select the SPG file through the button SPG File...
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select one bands, when the band is selected, the same is drawed in Auxiliar screen.
Through the selected band that the Control points are found. The select band is defined as the Adjust band.
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Areas
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If you wanted to find the Control points around bounding box of the active Infolayer, unmark the Areas item.
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If you wanted to find the Control points in just a few areas, mark the Areas item, to enable adds and removes of areas of search.
Makes this to adds one area:
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mark one region using the area cursor
in any other screen other than the Auxiliar.
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click on + button to adds the region.
Makes this to removes one area:
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select one area in the area list.
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click on - button to removes the region.
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click on Execute to find the Control points.
Observation 1: If the Areas item is marked, only selected areas on the list will be used in the search for Control points.
Observation 2: If the number of points found is less than 3, they are not included in the list of Control points.
Observation 3: Before execute, the Control points tab is selected, displaying the items found on a list and on Auxiliar screen.
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click on Save as Control Points button to save the Control points as Control Points for Image Register.
The Control Points are saved in SPG file.
Import SPG file:
After save the Control Points in SPG file, can import the SPG file in the File - Import - Import Registrated Images... option.
Register:
After save the Control Points in SPG file, can refine the Control Points on Register tool in the File - Register... item.