| 1 |
Error Correction |
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Actual Measuring Result of Error Correction for GM 2D Barcode
| Level |
Error Correction |
Continuum defilement, Max |
Disperse defilement, Max |
| 1 |
10 % |
7.1 % |
1.7 % |
| 2 |
20 % |
16.6 % |
4.0 % |
| 3 |
30 % |
27.2 % |
6.8 % |
| 4 |
40 % |
36.1 % |
10.0 % |
| 5 |
50 % |
46.2 % |
12.7 % |
|
| 2 |
Code Error Rate |
| |
Less than 1/1000000 for GM 2D barcode
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| 3 |
Anti-defilement Capacity Comparison |
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Defilement is acceptable in any place of GM barcode, the full information of which could be corrected and recovered in case that the defiled area is in the acceptable range for error correction.
| Corners Torn |
It is readable in case that 2~4 corners are torn. |
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| Edge Damaged |
It is readable in case that the edges are defiled. |
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| Penetrative |
It is readable in case that the defilement goes across the whole barcode. |
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| 4 |
Anti-deformation Capacity |
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| Anti-bending |
The maximum acceptable bending (right angle, concave or convex) for GM barcode surface is 90°,viz.it is readable within the range of 90°no matter the GM barcode label is in right angle,concave or convex deformation. |
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| Anti-Surface Wave |
The wave degree of barcode label surface means the ratio of depth to length of wave existed in sticking or printing surface. GM barcode label accepts the deformation D/L ≥ 0.2, (D=depth; L=Length). |
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| 5 |
Reading Direction |
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GM barcode could be read in all directions (360 degree) within the maximum degree of inclination as 45 degree.
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| 6 |
A Compare of Main Parameters of PDF417Code, QR Code, GM Code |
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| |
Max Capacity |
Error Correction |
Capacity of Anti-defilement & Anti-deformation |
| PDF417 Code |
1106 Bytes
0.2% Error Correction |
9 Error correction levels with correction capacity fron 2 to 512 code characters as the rate of equality |
Start / Stop Mode and level indicator can not be destroyed at the same time. It is applicable to use laser grating for scanning. |
| QR Code |
2953 Bytes
7%Error Correction |
4 optional ratio for error correction: 7%, 15%, 25% and 30% |
Positioning Mode can not be destroyed but flat surface is highly required. Defilement is seldom confirmed as erasure error. However, it is easily to be lost because of the poaitioning mode at corner or edge. |
| GM Code |
1143 Bytes
10%Error Correction |
5 levels for error correction from 10% to 50%, increased by equal difference. |
All regions could be defiled within the tolerance in line with error correction level ( unique feature ). Each code character could be positioned individually and it is easily to identify erasure error. It is acceptable for bending, folding and perspective deformation in large angle. |
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