QR Code Reader&Builder Tool

The two-dimensional bar code/two-dimensional code records the data symbol information in a black and white pattern distributed in a plane (two-dimensional direction) by a certain geometric pattern in a certain pattern; skillfully utilized in the code compiling to form the internal logic foundation of the computer The concept of "0", "1" bit stream, using a number of geometric shapes corresponding to binary to represent literal value information, automatic reading by image input device or photoelectric scanning device for automatic information processing: it has barcode Some commonalities of technology: each code system has its own specific character set; each character occupies a certain width; it has a certain check function. At the same time, it also has automatic recognition function for different rows of information, and handles the rotation change point of the graphic.

Advantages:

1. High-density coding, large information capacity: can accommodate up to 1,850 uppercase letters or 2710 digits or 1108 bytes, or more than 500 Chinese characters, which is about several times higher than the ordinary barcode information capacity.

2. Wide range of codes: The bar code can encode pictures, sounds, characters, signatures, fingerprints and other digital information, and is represented by bar codes; it can represent multiple languages; it can represent image data.

3. It has strong fault tolerance and error correction function: this makes the 2D barcode can be correctly read when it is partially damaged due to perforation, fouling, etc., and the damaged area can still recover information by 30%.

4. The decoding reliability is high: it is much lower than the normal bar code decoding error rate of two parts per million, and the bit error rate is not more than one ten-thousandth.

5. Encryption measures can be introduced: confidentiality and anti-counterfeiting are good.

6. Low cost, easy to manufacture, and durable.

7. The barcode symbol shape and size ratio are variable.

8. The 2D barcode can be read using a laser or CCD reader.