ITPEC IP October 2022 Question 78
Which of the following is a code that stores information in a vertical and horizontal two-dimensional pattern?
Explanation
QR code — a two-dimensional code that stores data in a square matrix of cells read both vertically and horizontally.
A QR code arranges black and white cells in two dimensions, so it holds far more data than a one-dimensional barcode in the same area, including alphanumeric and kana/kanji text. Finder patterns in three corners let a reader detect position and orientation from any angle, and error correction allows reading even when part of the code is dirty or damaged.
Answer (d)
Why not others:
- •(a) ASCII code — a character code assigning 7-bit numbers to letters, digits and symbols; it is not a printed pattern
- •(b) G-code — a programming language of commands for NC machine tools and 3D printers
- •(c) EAN code — the international product barcode (JAN in Japan), a one-dimensional pattern of bars read in a single direction
Key rule: Barcodes such as EAN/JAN encode data in one direction, while QR code encodes it in two dimensions, giving more capacity, omnidirectional reading and error correction.
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