The small dots are then converted to binary numbers and validity checked with an error-correcting code. The processor locates the three distinctive squares at the corners of the image, and normalizes image size, orientation, and angle of viewing, with the aid of a smaller square near the fourth corner. Unlike the old barcode that was designed to be mechanically scanned by a narrow beam of light, the QR code is detected as a 2-dimensional digital image by a semiconductor image sensor and is then digitally analyzed by a programmed processor. Initially designed for the automotive industry has gained popularity in other areas such as retail packaging, storing web address and in smart phones due to its large storage capacity compared to standard UPC barcodes and fast readability. QR code short for Quick Response Code is a two-dimensional matrix type barcode.
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