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We've covered almost everything we need to create QR Codes. The next thing we need is version information blocks. The version information blocks simply tell the reader what version the symbol is, and therefore how many modules wide and tall it is. Table 11 shows the...

Now that we've got the data and error correction sorted out, we're almost ready to place it in the symbol. As seen in Part 2, the data and error correction modules basically go everywhere that isn't taken up by something else. The reason we're not quite ready to place...

I had planned on holding off the error correction until later, but it really fits better right here. Before error correction is done, the data that we've generated must be broken down into "code words", which are just 8-bit bytes. All we have to do is take our "bit...

Now we'll cover how the data is encoded. There are several steps involved. First, the encoding method is chosen, then the raw data is converted to binary based on the encoding method, then the error correction algorithm is applied, and then the data is placed in the...

The next important thing we'll look at is the structure of a QR code. The below diagram shows names of the different sections of a QR symbol. Then I'll go over each one in more detail. Keep in mind that below if I mention one copy of something being the original and...

Recently I undertook a task to develop a QR Code generator. I was surprised to find how difficult it was to find complete information on the QR Code specification. Most of what I found only explained part of the puzzle. So my new endeavor is to completely explain the...