ISO 18004 QR Code Grading Parameters

• ULP (Upper Left Pattern), URP (Upper Right Pattern) and LLP (Lower Left Pattern): three identical components of the finder pattern found in the respective corners of the QR Code symbol. Each finder pattern is composed of 7x7 dark modules, 5x5 light modules, and 3x3 dark modules. MicroQR code contains one finder pattern in the upper, left corner of the symbol.

• HCT (Horizontal Clock Track): The horizontal timing pattern consisting of a one module row of alternating dark and light modules.

• VCT (Vertical Clock Track): The vertical timing pattern consisting of a one module row of alternating dark and light modules.

• ALP (Alignment Pattern): The alignment pattern consists of 5x5 dark modules, 3x3 light modules, and a single central dark module. The alignment pattern is only present in QR Codes version 2 or higher.

• FIB (Format Information Block): The format information block is the encoded pattern containing information on symbol characteristics such as the Error Correction Level and the data mask pattern.

• VIB (Version Information Block): The version information block is the encoded pattern containing information on the symbol version. The version information block is only present on QR Codes version 7 or higher.