Unverified50% confidenceFactExact time
According to the ISO/IEC 18004 standard, QR codes define 40 size levels ranging from Version 1 (21×21 modules) to Version 40 (177×177 modules), as well as four error correction levels: L, M, Q, and H.
1
Sources
50%
Confidence
Long-term
Relevance
8/9/2026
First Seen
Sources
喷泉码QR传输：无网络环境下的光学文件传送方案
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