what are QR codes and how does my phone camera associate them with a link or URL
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A QR code is a barcode but in 2 dimensions.
A barcode, when scanned in one direction, represents a set of numbers and/or letters. A barcode is easier for a machine to read than writing out the numbers/letters. If you scratch out text, you can’t read it but a barcode can take a few scratches and scrapes while still being readable.
A QR code stores more information than a barcode because it can use 2 dimensions to store numbers and letters. That’s why it can be scanned and represent a hyperlink. They can also be smaller than writing out the entire link. They have some protections against damage but not as much as the simple barcode.
They are pretty much visual binary code. The black/white squares are 1s and 0s to encode pretty much any data you like. Then there is a part that helps to find the alignment (so it still works when flipped) and the data is slightly redundant (so you can block part of the QR Code and still read it).
Your phone has a program that knows how exactly the bits are to be read, and then interprets that binary number as a series of ASCII characters that form the link.
A bit more detailed: the phone knows wich order to read the squares. It starts and reads Black/Black/White/Black, transforms that to 1101, wich is 13 in decimal, and could be the letter N (made up example)
They are pretty much visual binary code. The black/white squares are 1s and 0s to encode pretty much any data you like. Then there is a part that helps to find the alignment (so it still works when flipped) and the data is slightly redundant (so you can block part of the QR Code and still read it).
Your phone has a program that knows how exactly the bits are to be read, and then interprets that binary number as a series of ASCII characters that form the link.
A bit more detailed: the phone knows wich order to read the squares. It starts and reads Black/Black/White/Black, transforms that to 1101, wich is 13 in decimal, and could be the letter N (made up example)
They are pretty much visual binary code. The black/white squares are 1s and 0s to encode pretty much any data you like. Then there is a part that helps to find the alignment (so it still works when flipped) and the data is slightly redundant (so you can block part of the QR Code and still read it).
Your phone has a program that knows how exactly the bits are to be read, and then interprets that binary number as a series of ASCII characters that form the link.
A bit more detailed: the phone knows wich order to read the squares. It starts and reads Black/Black/White/Black, transforms that to 1101, wich is 13 in decimal, and could be the letter N (made up example)
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