Regeemy - System Operation

July, 29, 2005.

National Institute for Space Research.

Brazil.

Regeemy reference version 0.2.41.

 

This document describes a step-by-step example of a two images mosaic using Regeemy.

 

Step One - Selecting input images.

 

The system designates reference image as Image-1 and sensed image as Image-2. To open the images use Browse buttons indicated with numbers 1 and 2 ( Figure 1 ).

 


Each image will be opened in its respective window (Figure 2). The image window caption contains: zoom factor, image number and file name, respectively.

A tool bar, indicated by number 3, can be used for image saving, pointer tool selection, zoom changing and other operations. The image window also shows image space and color resolutions, cursor pixel position and tool information in the bottom status bar indicated with number 4. 

 


 


Step 2 - Finding tie-points

 

In order to select matching areas, press button Select Rectangles indicated by number 5 (Figure 3) on the Register tab. Then, simply select one rectangle from the reference image and one rectangle from the sensed image windows, as indicated by numbers 9 (Figure 4) and 10 (Figure 5).

 


 


If you don't want to select rectangles, just skip this pass and press Auto Find Tie Points

button, indicated by number 6 (Figure 3), to automatically extract control points. If the list of control points isn't empty then system will ask for what should be done with new points.

 


 


 


Step Three - Editing tie-points

 

Control points extracted in the previous step can be seen in image windows as well in a Tie Points editor    window (Figure 6), accessed by pressing the button indicated by number 8 (Figure 3) 

Selecting a point, the difference (in pixels) between reference and transformed points is presented in the tool bar, indicated by number 11. The selected point is also showed on the image windows.

 


 


Tie points can be saved for later use. There are 2 supported formats: Regeemy internal format and ENVI points file format. Tie-points can be saved by using the "File à Save As” menu, as indicated by number 12 (Figure 6).

Transformation information is showed in a Log window (Figure 7), witch can be accessed by pressing the Log window Button, as indicated by number 7 (Figure 3).

 


 


Step Four - Mosaic rendering

 

To register or mosaic images select Mosaic tab at the Registration Control window, as indicated by  number 14 (Figure 8).

 


 

        The mosaic output depends on the selected rendering type (indicated by number 13), where can be selected:

·         Both Images: Both images will be adjusted and rendered in one RGB channel.

·         Different Channels: Both images will be adjusted and rendered in separated RGB channels, generating a RGB composition.

·         Only First Image: Only the first image will be adjusted to the second one and rendered.

·         Only Second Image: Only the second image will be adjusted to the first one and rendered.

·         Register Only: The second image will be registered only, based on the first one.

·         Images Subtraction: The rendered image will contain a pixel-by-pixel subtraction of the adjusted images.        

·     Images Difference: The rendered image will contain a pixel-by-pixel difference of the adjusted images. There are three supported types: Absolute, quantitative and qualitative difference.

 
        The generated image canvas can be adjusted depending of the desired application. There are three crop modes, indicated by number 15 (Figure 8):

·         Crop into the first: The result image will be adjusted and cropped following the reference image canvas.

·         Crop into the second: The result image will be adjusted and cropped following the second image canvas.

·         Crop into the overlap: The result image will be adjusted and cropped following the overlap of both images.

 
        To generate the mosaic image press Register or Mosaic button as indicated by number 16. A new image window (RES) will be created (Figure 9). This image can be saved to disk by using the menu "File
à Save as” on the same window, indicated by number 17.