QR Codes??? | Tutorial Freak – Online Tutorials

QR Codes???

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Everywhere you look these days you see these strange black & white square images that at fist seem meaningless but think of barcodes, they get scanned everyday on the goods we buy, Unlike the older, one-dimensional barcode that was designed to be mechanically scanned by a narrow beam of light, a QR code is detected by a 2-dimensional digital image sensor and then digitally analyzed by a programmed processor. The processor locates the three distinctive squares at the corners of the QR code image, using a smaller square (or multiple squares) near the fourth corner to normalize the image for size, orientation, and angle of viewing. The small dots throughout the QR code are then converted to binary numbers and validated with an error-correcting code.

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