Image
EAN-139781409505594   EAN-13 barcode 9781409505594
Product NameHow Zebras Got Their Stripes (Usborne First Reading)
LanguageEnglish
CategoryBook / Magazine / Publication
Amazon.comA Buy on Amazon ~ 1409505596
SKU749781409505594
Price New4.11 US Dollars    (curriencies)
Price Used1.47 US Dollars    (curriencies)
Width0.35 inches    (convert)
Height7.72 inches    (convert)
Length5.12 inches    (convert)
Weight4.16 ounces    (convert)
AuthorLesley Sims
Page Count32
BindingHardcover
Published06/19/2017
Long DescriptionThis is a new title in the fantastic Usborne Reading Programme, based on an old African folktale and aimed at children who are beginning to read. Once upon a time, zebras didn't have stripes but a greedy baboon changed all that...This key series was developed in conjunction with reading expert Alison Kelly from the University of Surrey. Every title has clear and compelling text that allows children to build their burgeoning reading skills and is accompanied by charming and highly appealing illustrations.
Similar Items9780794512750: The Dragon Painter (Usborne First Reading Level 4)
9780554393087: The Dragon Painter (Usborne First Reading Level 4)
9780554300054: The Dragon Painter (Usborne First Reading Level 4)
9780746078877: The Emperor And The Nightingale: Level 4 (First Reading): Level 4 (First Reading)
9780746077092: The Castle That Jack Built: Level 3 (First Reading): Level 3 (First Reading)
9780794522612: Danny The Dragon (Usborne First Reading, Level 3)
9780794518110: The Sun and the Wind (Usborne First Reading Level 1)
9780794512743: The Ugly Duckling (Usborne First Reading Level 4)
9780746077146: The Dinosaur Who Lost His Roar (Usborne First Reading)
9780794515478: The Dinosaur Who Lost His Roar (Usborne First Reading: Level 3)
9780794524241: The Chilly Little Penguin (Usborne First Reading: Level 2)
9780794522810: The Scaredy Cat (Usborne First Reading: Level 3)
Created11-24-2012 5:43:56am
Modified06-19-2017 6:10:17pm
MD5ac402cb0ac189e69624cf7f2e31d4f72
SHA256e2d626554dde5760ca4a93061cf22102b25ce829548302ba2732e60a05af4de6
Search Googleby EAN or by Title
Query Time0.0235782

Article of interest

Barcodes are a graphical representation of information that can be easily read by machines. People read text easy enough but machines find this to be too complex so we use barcodes to simplify the process.

Barcodes can store numbers, letters and all the special characters. What can be stored in the barcode depends on which type of barcode is being used. But the basics of how a barcode works is the same regardless of what type of code it is, what information is stored in the barcode or what type of scanner is being used.

barcode scanIt all starts with the scan. The scanner, regardless of which type you are using, will examine the barcode image. The lines (or blocks in the case of 2D barcodes) will either reflect or absorb light. When we look at the barcode, we tend to see the dark stripes and think of those as the important parts. Those are the parts that absorb the light and the white parts reflect the light. So the scanners tend to see the barcodes in reverse of how we think of them. But the dark and light portions of the code on their own don't automatically become the information stored in the code. In most cases, it is the relative placement and size of each dark and light stripe (or block) that make up the information. There are also special markers that help the scanner know which direction the barcode is facing when it is scanned. This allows the scanning process to work even if the barcode is upside down when it is scanned. The scanner simply processes the scanned data in reverse in this case.

barcode oscolloscopeTaking a look at an oscolloscope screen as a scanner passes over barcode, you can see that the stripes reflect back light and the scanner registers the changes as high and low levels. So what looks like a simple image is really a rather complex set of layered encryption to store the data. The encryption isn't done to hide the information in this case. Instead it is done to make it easy for the machine to read the information. Since the base language of machines is binary (1 and 0) it is easy for them to read this type of information even if it takes several steps to turn this back into something that people can understand.

binaryThe size of each high and low are combined to make binary data. A series of 1 (one) and 0 (zero) values which are strung together then decoded into the actual information. Up to this point, the process is the same for all barcodes regardless of how they are stored. Getting the lines or dots into binary is the easy part for the machine. The next step is to make this binary code into something useful to people. That step depends on  which type of barcode is being scanned. Each type of barcode has its own encoding methode. Just like human languages, what seems to be two similar words (or barcodes in this case) could actually be two very different values even though they have the same basic letters (or bars).

So you can see that the scanning devices need to know not only how to turn the bars or dots into binary, but after they have done that they need to know how to turn that binary string into the original information. But regardless of the encoding process the basic steps are the same. Process the light and dark areas, convert them to binary, decode the binary, pass the information on to the receiving device which is normally a computer program of some sort.

Once the decoded data reaches the computer program, there is no telling how the information is to be used. The grocery store will use the information to keep track of the products you purchased as you go through the register. A manufacturer will use the code to identify where they are storing their parts. And shipping companies use the codes to keep track of the packages they are delivering.

Now that you know a little about the mechanical portion of the process, take some time to learn about the different types of barcode scanners and the different ways the information can be encoded into barcodes.

Close

Search

Close

Share