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Oblique Image Correction

Displaying images:

Use the toolbar or its menu equivalents to load and view images:

 

This button activates an open image dialogue form.

Click on:

 

If an image has been loaded, this button creates a new image of the same size or scaled over a limited range. This is to be used when you don't have a map or other image to which you want to transform the first loaded image.

Navigation:

After loading two images, you are ready to begin.

 

 

You can move to any part of an image by dragging on the blinking red/white frame in the small navigation window. If you need to access the upper left corner of the image which is hidden by the drag/zoom window, simply press F2, and it will be temporarily hidden. Pressing F2 again causes it to reappear.

This button toggles between the full view of an image shown immediately after loading and a 1:1 pixel representation.

A right click on a displayed zoomed image brings up a window which shows an overview. Position the red/white frame by moving the mouse and with a click, this area will be displayed.



Image utilities can be called using this section of the toolbar or their menu equivalents:

Click here to print an image.

Click here to cut out part of an image and copy it to the clipboard.

Click here to copy part of an image to the clipboard.

Click here to paste part of an image from another image into the currently active image.

Click here to line up multiple images in cascaded order.

Click here to line up multiple images in horizontal order.

Click here to line up multiple images in vertical groups.

Click here or here   to rotate an image through 90 degrees to aid in selecting control point corresponding to those in another image with different orientation.

Click here to resize an image or rescale it by width or height independently.

If a geo-referenced map using an ESRI ArcGis/View "World" file or a MapInfo "Tab" file is opened, geo-referencing is preserved after transformation and saving by automatically copying the World or Tab file to one with the same name as that used for saving the transformed image as long as the map was neither scaled nor rotated in AirPhotoSE. When the map file containing the transformed image is opened in ArcGis/View or MapInfo, it is geo-referenced just as it was prior to rectification. 

Warning:

GeoTiff data in a Tiff image file is not carried over to an output file made by AirPhotoSE. Never rotate or rescale a map if it has geo-referencing information in a World or Tab file or the geo-referencing will be incorrect. 

Below is the main status bar shown at the bottom of the display.  



In the first section, the current pixel coordinates of the mouse or hints for menu and toolbar button choices are shown.

The second section shows a scaling track bar for setting the output scale of a transformed image relative to the size of an input image.

Note:

It must be set before transforming an image.

The third section shows progress for various file operations like loading, saving, rotating etc.

The final section shows the geographic grid coordinates when a map or orthoimage has been loaded and calibrated.  Otherwise it shows the position of the mouse cursor in pixels.