
Image Signature Symmetry

Image Matching is done through something called Image Signature. 
An image has a set of computed values called features. A collection 
of features is grouped into a signature. 


A single image signature will take care of a certain amount of variation. 
To increase the variations, additional signatures will be added, which is the purpose of this menu.
For example, if you flip an image, a new signature needs to be added.

 

To search for an image:

1. Select a folder (Click the “1” Button in the Toolbar);

2. Get Library Signatures (Click the “2” button in the Toolbar);

3. Select a Key image (Click the “3” Button in the Toolbar);

4. Search (Click the “4” button in the Toolbar).


Each menu item in the "Signature" Menu can replace step 2 of the above.




To compute the signatures:

1. Select a folder (Click the “1” Button in the Toolbar);

2. Get Library Signatures (Click a menu item in the "Signature" menu).



This menu supports the following variations:


Signatures/Scale  (95,90,85,80)
	This menu item generates 7 image signatures:
	100%, 90%, 80%, 70%, %60, %50, %40.
	Here 90% is an image that has 5% border region removed. 
        

Signatures/Rotation (90,180,270) 
	This menu item generates 4 image signatures:
	0, 90,180,270. 
	Here 90 is an image that has a 90 degree rotation. 


Signatures/Flip (X,Y,XY)
	This menu item generates 4 image signatures:
	0, X, Y, XY. 
	Here X is an image that has flipped around x axis. 


Signature/Flip Rotation (16 variations)
	This menu item generates 16 image signatures:
	{0, 90,180,270} ^ {0, X, Y, XY}. 
	Here (90, X) is an image that has 90 degree rotation and flipped around x axis. 


Signature/Stretch (4 variations)
	This menu item generates 5 image signatures:
	(0,0), (120%, 100%), (80%, 100%), (100%, 120%), (100%, 80%).
	Here (120%, 100%) are stretch percentages along x and y directions. 
         

Signature/Resize  
	This menu item generates 5 image signatures:
	100, 150, 200, 300, 400.
	Here 150 increases the image size by 50% in terms of pixels counts in each directions. 



            

