Sửa lỗi trong Micro QR và rMQR

Error Correction in Micro QR and rMQR

Compact QR code variants — Micro QR and rMQR — have reduced error correction options compared to standard QR codes. Understanding these limitations is critical for space-constrained applications.

Micro QR Error Correction

Micro QR codes offer limited EC levels depending on the version:

Notable: EC Level H (30%) is not available in any Micro QR version. Version M1 can only detect errors, not correct them.

rMQR Error Correction

Rectangular Micro QR codes support only two EC levels:

Levels L and Q are not available for rMQR. This limits flexibility — you must choose between moderate (M) and high (H) protection.

Capacity Impact

The reduced symbol size of compact variants means EC has a proportionally larger impact on capacity. For Micro QR M4 at EC-L, maximum byte capacity is 21 characters. At EC-Q, it drops to 11 characters — a 48% reduction.

For rMQR, the rectangular aspect ratio provides more total modules than a Micro QR of equivalent height, partially offsetting the EC overhead.

Practical Recommendations

• For critical data: Use standard QR codes instead of compact variants
• Micro QR M1: Only use for extremely simple numeric data where detection (not correction) suffices
• Micro QR M3/M4 at EC-Q: Good balance for industrial labels
• rMQR at EC-H: Provides robust correction in a narrow form factor

Scanner Compatibility Note

Not all scanners support Micro QR or rMQR error correction fully. Some may decode correctly at EC-L but fail to apply full error correction at higher levels. Always test with your target scanning hardware before deploying in critical applications.

Key Takeaways

• Micro QR lacks EC Level H; Version M1 supports detection only
• rMQR supports only M and H error correction levels
• EC has a proportionally larger capacity impact on compact variants
• Standard QR codes remain the best choice for critical or high-damage scenarios
• Scanner support for compact variant EC is inconsistent