CogIDProcessControlMetricsISO15415 Properties

Cognex VisionPro

The CogIDProcessControlMetricsISO15415 type exposes the following members.

Properties

Name

Description

Two-dimensional matrix symbols include data fields of modules nominally lying in a regular polygonal grid, and any reference decode algorithm must adaptively map the center positions of those modules to extract the data. Axial Nonuniformity tests for uneven scaling of the symbol which would hinder readability at some non-normal viewing angles more than at others.

This is a measure of how much the sampling point spacing differs between the X and Y axes.A value of 0 means there is no difference.

AxialNonUniformityGrade

AxialNonUniformityGrade is derived from AxiaNonUniformity as follows:

A: 0.00 ≤ x ≤ 0.06
B: 0.06 < x ≤ 0.08
C: 0.08 < x ≤ 0.10
D: 0.10 < x ≤ 0.12
F: 0.12 < x ≤ 1.00

This is a measure of how much the sampling point spacing differs from one axis to another. A(negligible), B, C, D, or F(excessive).

ExtremeReflectanceGrade

Indicates the risk of excessively high or low reflectance values in the extended symbol area. Grade A is for insignificant risk; Grade F is for significant risk. If either FixedPatternDamageGrade or ModulationGrade is F, then this grade will be Undefined.

FixedPatternDamageGrade

The FixedPatternDamageGrade is the lowest of the five segment grades and the grade for AG. Grading of AG:

Mean of five segment grades	Grade
4	4
≥ 3.5	3
≥ 3.0	2
≥ 2.5	1
< 2.5	0

GridNonUniformity

Grid Nonuniformity measures and grades the largest deviation of the grid intersections from their ideal theoretical position.

GridNonUniformityGrade

GridNonUniformityGrade is derived from GridNonUniformity as follows:

A: x ≤ 0.38
B: 0.38 < x ≤ 0.50
C: 0.50 < x ≤ 0.63
D: 0.63 < x ≤ 0.75
F: x > 0.75

ModulationGrade

Modulation is a measure of the uniformity of reflectance of the dark and light modules respectively. Modulation, if insufficient, may increase the probability of a module being incorrectly identified as dark or light. ModulationGrade is derived from Modulation as follows:

A: x ≥ 0.5
B: x ≥ 0.4
C: x ≥ 0.3
D: x ≥ 0.2
F: x < 0.2

OverallGrade

The OverallGrade is the lowest of all computed grades.

PrintGrowth

Print Growth tests that the graphical features comprising the symbol have not grown or shrunk from nominal so much as to hinder readability with less favorable imaging conditions than the test condition.

SymbolContrast

The percentage difference between the foreground and background grey levels.

Range is 0.0 (no contrast) to 1.0 (full contrast).

SymbolContrastGrade

SymbolContrastGrade is derived from SymbolContrast as follows:

A: 0.70 ≤ x < 1.00
B: 0.55 ≤ x < 0.70
C: 0.40 ≤ x < 0.55
D: 0.20 ≤ x < 0.40
F: 0.00 ≤ x < 0.20

UEC

The Unused Error Correction parameter characterizes the extent to which regional or spot damage in the symbol has eroded the reading safety margin that error correction provides.

The higher the unused error correction capacity, the better the symbol quality. Ranges from 0 (all error correction capacity used) to 1.0 (no error correction capacity used).

UECGrade

UECGrade is derived from UEC as follows:

A: x ≥ 0.62
B: x ≥ 0.50
C: x ≥ 0.37
D: x ≥ 0.25
F: x < 0.25

The greater the unused error correction capacity, the better the grade. A(almost all capacity is unused), B, C, D, or F(all, or almost all capacity is used).

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