6.4 Checking the Results
You can find out the identification rates of your matching by a few clicks. You must prepare a file, which indicates the matching pairs. To test the results in b1.txt, you must prepare a file called b1_matchlist.txt file, which states who in b1.txt should match with whom.
An example of b1_matchlist.txt is:
400
101 2067(1) 2067(1)
102 2067(2) 2067(2)
103 2067(3) 2067(3)
104 2067(4) 2067(4)
105 2067(1) 2067(4)
106 2067(2) 2067(1)
107 2067(3) 2067(2)
108 2067(4) 2067(3)
…
Line 1 is the number of matches in this file. In our example, there are 25 quadruplets, so each image should match with 4 other images, giving a total of 100 * 4 = 400 positive matches. The format is b1_matchlist.txt is:
Number, tab, filename, tab, filename.
Note:
You MUST have a tab between the three columns;
The file names do not contain “.jpg”.
There are two common errors:
(1) The Tab is replaced by a space;
(2) The number of rows is less than the first number in the file.
To continue our recognition example, we must prepare the b1_matchlist.txt file now. This file is already prepared for you and we will simply open it and save it to b1_matchlist.txt (overwrite the existing file). The steps are:
-
Open “./data/b1_matchlist_ex_wheel.txt. Save it to b1_matchlist.txt (overwrite the existing file). Now this file is prepared.
-
Click “Unsupervised/N:M Analysis/Check (b1_matchlist.txt required)” to check the results of the BioFilter.
You will see something like the following in the text window:
Blocks = 101
…
Total Matches = 218
The message indicates b1.txt has 101 blocks: the 100 image blocks plus the last line indicating the total number of matches retrieved. The message “Total Matches = 218” indicates that 218 matches in b1.txt agrees with those in b1_matchlist.txt. Matching 218 out of 400 is not accurate; we will get this rate to 100% by training.
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