Alignment Pattern
QR Code Alignment Pattern
Smaller square patterns in larger QR codes that help correct distortion when scanning at an angle.
Chi tiết kỹ thuật
Alignment Patterns encode data in a 2D matrix of black and white modules (squares). Version 1 is 21x21 modules; version 40 is 177x177, storing up to 4,296 alphanumeric characters. Four error correction levels (L:7%, M:15%, Q:25%, H:30%) add Reed-Solomon redundancy, allowing data recovery from damaged or partially obscured codes. The three large finder patterns in corners enable orientation detection, while alignment patterns (added in version 2+) compensate for surface curvature and printing distortion.
Ví dụ
```javascript
// QR code generation with error correction
const qr = generateQR({
data: 'https://peasytools.com',
size: 256, // pixels
errorCorrection: 'M', // L(7%), M(15%), Q(25%), H(30%)
margin: 4, // quiet zone modules
});
// Output as SVG (scalable, smallest file size)
document.getElementById('qr').innerHTML = qr.toSVG();
```
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Thuật ngữ liên quan
Glob Pattern
QR Code Version
Module
Error Correction Level
Finder Pattern
Quiet Zone
Data Matrix
EAN-13
UPC-A
Code 128
Code 39
Aztec Code
PDF417
Micro QR
ISBN
ITF-14
vCard QR
WiFi QR
Masking Pattern
Reed-Solomon
rMQR
GS1 DataBar
MaxiCode
Codabar
QR Code Capacity
Han Xin Code
Structured Append
ISSN Barcode
Pharmacode
DotCode
GTIN