Perspective Correction

Displaying images:

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

 


This button activates an open image dialog form.

For the moment, only two images at a time are permitted. After these are open, no further images may be opened.

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. 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 wil 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 in vertical groups.

Click 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.

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 trackbar for setting the output scale of a transformed image relative to the size of an input image.

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