12.5 Signature File Concepts
Signatures files are divided into three groups: Training Signature File, N-Signature File, and M-Signature File. In a 1:N Match, the 1-signature is computed at run time and the N-signature is computed in advance.
Training teaches the ImageFinder who should match with whom. Training is done through two files, a training signature file with a fixed name “.\data\t1.txt” and a match file with a fixed name “.\data\match.txt”. Here, “.\” is the folder where the executable files stay. Menu item, “Signature/Training Signature (t1.txt)”, generates training signatures from a specified directory of images.
In 1:N Matching, the Key image will be matched against all images in a directory. The key signature is computed first, as we demonstrated in the last section. Then this signature will be matched against all signatures in the N-signature file. The N-signature file has a fixed name, “.\data\a1.txt”.
In N:M Matching, the N-signature file, a1.txt, and the M-signature file, a2.txt, a3.txt, a12.txt, are computed first. Then all of the signatures in a1.txt will be matched against all of the signatures in a2.txt. The three M-signature files have fixed names, “.\data\a2.txt”, “.\data\a3.txt”, and “.\data\a12.txt”.
There are 5 menu items:
Signature/Training Signature (t1.txt)
Signature/N Signature (a1.txt)
Signature/M2 Signature (a2.txt)
Signature/M3 Signature (a3.txt)
Signature/M4 Signature (a12.txt)
These commands compute the signatures for all images in a directory. The only difference is where to save the signatures.
Menu item, Signature/Training Signature (t1.txt), computes the signatures for all images in a directory and saves the signatures to t1.txt, the training signature file.
Menu item, Signature/N Signature (a1.txt), computes the signatures for all images in a directory and saves the signatures to a1.txt, the N-signature file.
Menu item, Signature/M2 Signature (a2.txt), computes the signatures for all images in a directory and saves the signatures to a2.txt, the M-signature file.
Menu item, Signature/M3 Signature (a3.txt), computes the signatures for all images in a directory and saves the signatures to a3.txt, the M-signature file.
Menu item, Signature/M4 Signature (a12.txt), computes the signatures for all images in a directory and saves the signatures to a12.txt, the M-signature file.
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