Signature


The matching between a new video clip and previously stored video clips is implemented via “Signature” matching, 
i.e. all video must be converted into signatures first. A library is a collection of previously stored signatures. 
The matching is done via a new key signature against a particular library. 

You can have as many libraries as you want. 

Before matching, you will need to select a library and load it to the VideoFinder 7.0; then, you are ready to verify
the copyright information. 

The Signature menu provides you the menu items required for converting a video into signature files.


Key Signatures

The default key signatures are computing 40 – 80 signatures, depending on the length of the video. The menu item is:

Signature/Key Signature (Default)
	Use "Signature/Key Signature (Default)" to convert a key video clip into a signature 
	and save them to the file, “key.txt”. 		

 
The Key Signature Rules are:

Let N be the video Length In Seconds,

If N < 40 seconds, then the number of signatures is N, one per second;
Else if N  <  80 seconds, then the number of signatures is 40, one per second;
Else if N  < 120 seconds, then the number of signatures is 40, one every 2 seconds;
Else if N  < 160 seconds, then the number of signatures is 40, one every 3 seconds;
Else if N  < 200 seconds, then the number of signatures is 40, one every 4 seconds;
Else if N  < 240 seconds, then the number of signatures is 40, one every 5 seconds;
Else if N  < 280 seconds, then the number of signatures is 40, one every 6 seconds;
Else if N  < 320 seconds, then the number of signatures is 40, one every 7 seconds;
Else if N  < 360 seconds, then the number of signatures is 40, one every 8 seconds;
Else if N  < 400 seconds, then the number of signatures is 40, one every 9 seconds;
Else if N  < 440 seconds, then the number of signatures is 40, one every 10 seconds;
Else if N  < 500 seconds, then the number of signatures is 40, one every 10 seconds;
Else if N  < 550 seconds, then the number of signatures is 50, one every 10 seconds;
Else if N  < 600 seconds, then the number of signatures is 50, one every 11 seconds;
Else if N  < 650 seconds, then the number of signatures is 50, one every 12 seconds;
…

Besides the default setting, there are several options:


Signature/Key Signature (20)
	Use "Signature/Key Signature (20)" menu item to collect 20 signatures 
	from a video, regardless of the video length. 


Signature/Key Signature (40)
	Use "Signature/Key Signature (40)" menu item to collect 40 signatures 
	from a video, regardless of the video length. 


Signature/Key Signature (80)
	Use "Signature/Key Signature (80)" menu item to collect 80 signatures 
	from a video, regardless of the video length. 


Signature/Key Signature (Every 2 Sec)
	Use "Signature/Key Signature (Every 2 Sec)" to convert a key video clip 
	into a signature and save them to the file, “key.txt”. The number of signatures 
	is the video length in seconds divided by 2. 


The “Parameter” button will specify the starting frame, ending frame, and interval between signatures. 
The following menu item will compute the signatures with user-specified starting frame, 
ending frame, and interval between signatures.


Signature/Key Signature (User Setting)
	Use "Signature/Key Signature (User Setting)" to convert a key video clip into 
	a signature and save them to the file, “key.txt”. Users via the “Parameter” button 
	determine the start frame, ending frame, and interval.

                                                   

Signature/Library Signature (User Setting)
	Use "Signature/Library Signature" menu item to collects signatures from source 
	specified by the "Library" button and displayed in the "Library" text box. 
	The start frame, ending frame, and interval are determined by users 
	via the "Parameter" button.


 


	





		
