General

Question 1

How are QR Code versions referred to ?

Answer 1

Symbol versions are referred to in the form Version V-E where V identifies the version number (1 to 40) and E indicates the error correction level (L, M, Q, H).

Question 2

How are Micro QR Codes versions referred to ?

Answer 2

Symbol versions are referred to in the form Version MV-E where the letter M indicate Micro QR Code format and V (with a range of 1 to 4) and E (with values L, M and Q) have the meanings defined for QR Code.

Question 3

What is the difference between QR Code and Micro QR Code ?

Answer 3

These are 2 formats of the QR Code. Micro QR Code is a variant with a reduced number of overhead modules and a restricted range of sizes, which enables small to moderate amount of data to be represented in a small symbol. Particularly suited to direct marking on parts and components, and to applications where the space available for the symbol is severely restricted.

Question 4

What is a module ?

Answer 4

A module is a small square of the QR Code that encode a bit (0 or 1).

Question 5

How are QR Code versions referred to ?

Answer 5

For QR Code symbols, symbol versions are referred to in the form Version V-E where V identifies the
version number (1 to 40) and E indicates the error correction level (L, M, Q, H).

Question 6

How Micro QR Code versions referred to ?

Answer 6

For Micro QR Code symbols, symbol versions are referred to in the form Version MV-E where the letter
M indicates the Micro QR Code format and V (with a range of 1 to 4) and E (with values L, M and Q) have
the meanings defined above.

Question 7

How many QR Code formats exists ? List them

Answer 7

2

QR Code and Micro QR Code

Question 8

What is reflectance reversal ?

Answer 8

Normally a dark module is a binary 1, and a light module is a binary 0.

With reflectance reversal, a dark module is a binary 0 and a light module is a binary 1.

Question 9

What are the possible size of QR Code symbols ?

Answer 9

21 × 21 modules to 177 × 177 modules (Versions 1 to 40, increasing in steps
of four modules per side).

Question 10

What are the possible size of Micro QR Code symbols ?

Answer 10

11 × 11 modules to 17 × 17 modules (Versions M1 to M4, increasing in
steps of two modules per side);

Question 11

What are the QR Code encodable character sets ?

Answer 11

1) numeric data (digits 0 - 9);

2) alphanumeric data (digits 0 - 9; upper case letters A - Z; nine other characters: space, $ % * + - .
/ : );

3) byte data [default: ISO/IEC 8859-1; or other sets as otherwise defined (see 7.3.5)];
4) Kanji characters. Kanji characters in QR Code can be compacted into 13 bits.

Question 12

Which error correction code is used in QR Codes ?

Answer 12

Reed Solomon

Question 13

What are the levels of recovery of reed-solomon codes in QR Codes ?

Answer 13

— L 7%
— M 15%
— Q 25%
— H 30%

Question 14

What is orientation independence ?

Answer 14

It is the property of QR Code to be read even in case they are rotated or reflected (in a mirror)

Question 15

List some additional features of QR Codes ?

Answer 15

• Structured append
• Extended Channel Interpretations
• Reflectance reversal
• Mirror imaging

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Question 16

What are the 2 types of regions in a QR Code Square ?

Answer 16

• The encoding region (containing format information, version information and data and error correction codewords)
• The function patterns (Quiet Zone, the finder pattern, the separators, the timing patterns, the alignment patterns)

Question 17

What does ECI means ?

Answer 17

Extended Channel Interpretation