How do computers form images, how do they send images from one place to another? If you completed the last topic, you will know it has something to do with Binary, but how do you send a picture with binary and how do you turn it back into an image?
Click on the image to open the task.
In order to calculate the Hex values use this converter https://www.rapidtables.com/convert/number/hex-to-binary.html
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This is encoded in Denary, Base10 or decimal, but could easily have been encoded in binary. The first number indicates white spaces, so 4,11 would be 4 White and 11 Black.
This is why we do this with computers
You can also use this tool to help you
It may be helpful to use the Binary Card Simulator and Run Length Encoder
Pictures can also be used to store information. Barcodes and QR codes are common examples. Barcodes are reasonably straight forward with each number being represented by a different combination of black and white lines. QR codes on the other hand store binary numbers and are a bit more complicated. For more information see here. For a full hand solve of a QR code check out here (note there is some mild swearing).
At the end of this topic students will have had the opportunity to cover;
understand that digital devices store data using just two states represented by binary digits (bits) PO3
debug simple algorithms and programs by identifying when things go wrong with their instructions and correcting them PO4
be able to explain why things went wrong and how they fixed them PO4
understand that digital devices represent data with binary digits and can detect errors in data storage and transmission PO4
understand how computers store more complex types of data using binary digits PO5