QR codes and QR code scanners

QR codes and QR code scanners

1. QR CODES

   • • QR code for the text 'Hello World!'
     • The 3 big squares and (sometimes) a small square is used to find the orientation and alignment of the QR code. Due to these, the QR code can be scanned in any direction.
     • The rest of the code seen is used to store version info, format info, timing, error detection and storing the main information. Hence, due to error detection, even if some part of the code is omitted, you would obtain the correct information.
   • Can hold over 7000 digits of information
     • It can easily store URLs, images, text, etc. in a small amount of space
       • Used by various companies to advertise in magazines, newspapers, billboards, business cards, etc.

2. QR CODE SCANNERS

   • Now, these scanners are an in-built function in smartphone cameras, so people can scan QR codes anytime, anywhere.
     • Due to the availability of scanners, and the advantages of QR codes (mentioned below), it is used by companies for advertisements.
     • The scan function takes a picture of the code in any direction, and the smartphone's processor differentiates between the dark and light squares, and reads the code. Then it displays the information. If it is an URL, then it would immediately redirect you to the website, therefore a viable and a useful way for advertising.

3. QR codes v.s. Bar codes

   • QR codes can store over 7000 digits, while Bar codes can at most store 30 digits.
   • QR codes can be scanned in any direction, while bar codes can only be scanned in one direction, at one specific angle.
   • QR codes can display the correct information if some of the code is omitted, while bar codes cannot.

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