QR Codes and Barcodes : How they Work?? - GoTechTalk

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Thursday, July 26, 2018

QR Codes and Barcodes : How they Work??



I'm going to tell you about something, images with data stored inside them and you might ask what are you rambling on about now, actually what I'm talking about is something very mundane barcodes those like square lined images found on everything that store information in sequences of lines that can be read and interpreted by machines but where did they come from??

Well Norman Joseph woodland inspired by a conversation that he overheard and taking inspiration from Morse codes dots and dashes theorized by shining a bright light at a series of elongated dots and dashes then using a machine to read the pattern of light reflection back to a receiver remember black absorbs light and white reflects it one could quickly read stocking codes for groceries dramatically simplifying records keeping and speeding up the customer experience in one fell.

Well the theory was solid but in practice while it did work the first attempt was the size of a desk and used a 500-watt bulb that got so hot it could light paper on fire not exactly practical to deploy for price checks in the aisles at the local Toys, but the proof of concept was enough that when combined with laser technology a 1 mill watt helium-neon laser in the early days, barcodes became the most efficient way to quickly read a string of alphanumeric characters but while all barcodes look pretty darn similar to the bare eye and share common features like a start and end code so they can be read correctly regardless of orientation there are a variety of different standards with different characteristics with UPC being the most common that encode data in different fashions and can only be read by compatible scanners and software, so watch out for that when you're getting barcodes to itemize your stamp collection.


Another thing that all barcodes share is that practically speaking they are limited to about 20 alphanumeric characters that my friends is where QR or Quick Response Codes developed in 1994 come in, these consist of black dots arranged in a square grid on a white background and they've got a couple of significant advantages while the Venerable barcode functions in just one dimension, QR codes work in both the horizontal and vertical and can hold up to 350 times the information of a UPC barcode with finer or higher dpi prints  capable of holding more information than fuzzy ones on top of that they have built in error correction making them less susceptible to damage from water wear and tear, they are much easier to read with a camera versus a specialized reader meaning that throwing a QR code onto your product will allow a marketer to direct smartphone equipped shoppers to see more detailed product information check out educational videos and more cool right so what does the future hold for the barcode though it's hard to say 40 years of dominance would suggest that it's not going to be completely overthrown anytime soon but that doesn't mean that time is standing still and 3d codes where height can also be used to store data already exist but with the way that 24/7 Internet connectivity and cloud-based image recognition are advancing I'd say a more likely long-term replacement even if we're still a few years away from it is simply pointing your camera or looking forward even further your augmented reality glasses or contact lenses at something and having its key stats show up in your peripheral vision.


Alright, guys, that's the end of the blog, thanks for reading the whole way through if you enjoyed this blog please share it with someone who would be interested and leave a comment, Thanks for reading guys.

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