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Creating a QR Code step by step

(www.nayuki.io)
246 points D4Ha | 2 comments | 17 Nov 24 18:26 UTC | HN request time: 0.399s | source
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bb88 ◴[17 Nov 24 21:59 UTC] No.42167696[source]▶
This is pretty awesome. I would like to see the same thing for the decoder.
replies(3): >>42168723 #>>42170166 #>>42171026 #
1. smitelli ◴[18 Nov 24 00:53 UTC] No.42168723[source]▶
Same. I always marvel at how my phone can decode a badly lit, blurry, 1/4 out of frame QR code as quickly as it does.
replies(1): >>42179450 #
2. bb88 ◴[19 Nov 24 02:06 UTC] No.42179450[source]▶
My first instinct would be to go look at the discrete cosine transform that JPEG uses. But I don't know how to do the other parts like aligning and using the timing patterns.