Extras

  • Puzzle 5: Where is 007?
    • Face images from AR database (A.M. Martinez and R. Benavente. The AR Face Database. CVC Technical Report #24, June 1998) are: (i) cropped, (ii) converted to gray scale, (iii) randomly rotated & scaled & translated to arrive at this composite image (image size is 2000x2000 pixels). Find the location of subject 007 in the image.

  • Puzzle 4: Fingerprint Block Shuffling
    • A 500 DPI fingerprint image (size: 448 rows x 384 columns) is cut into 32x32 non-overlapping blocks, and every block is (i) randomly translated, and (ii) randomly rotated (either 0, 90, 180, or 270 degrees) to arrive at this image. Reconstruct the original fingerprint image.

  • Puzzle 3: Fingerprint Counting
    • 12 fingerprint images in this table are rotated, translated and scaled, to arrive at this composite image (image size is 5000x5000 pixels). Find the counts of every fingerprint image given in the table.

  • Puzzle 2: Crypto-Biometrics
    • A plain text (to be found) composed of 498 characters is encrypted using Vigenère cipher, resulting in this cipher text. The Vigenère key sequence utilized for encryption is formed via the following procedure: All the occurrences of all of the words in this list, in any one of 8 -cardinal or ordinal- directions of the compass are marked (5 examples are given) in this puzzle. Then, all of the unmarked characters in the puzzle grid are concatenated from left-to-right, top-to-bottom to arrive at the key sequence.

  • Puzzle 1: 652 Words of Biometrics
    • All of the 652 words in this list can be placed (6 examples are given) into this puzzle (page size is A0) by using each word only once, either top-to-bottom, or left-to-right.