Discussion
The following functions are carried out by timing element of the QR code :
(i) Used for determining the central coordinate of each cell in the QR code
(ii) Helps the QR code scanner determine how large the data matrix is in the QR code
(iii) Used for modifying the distortion of QR code
(iv) Helps the QR code scanner differentiate the QR code from the surroundings
Answer: D
The answer is (i) and (ii) are correct.
The timing pattern is the row and column of alternating black and white modules running between the finder patterns. Because it marks off every module, the scanner uses it to fix the centre coordinate of each cell and to tell how large the data matrix (the version of the code) is.
Correcting distortion is the job of the alignment pattern, and separating the code from its surroundings is the job of the blank quiet zone around it, so options with (iii) or (iv) are wrong.
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