What’s an example usage of barcodes??
- Airline baggage tracking
- Product labelling
- Parcel delivery and shipment
- Ticketing and identification
What concept allows barcode readers to work??
Reflected light
What does a black bar represent in a barcode??
$$ 0 $$
Why does black represent $0$ in barcodes??
Black reflects less light.
What does a white bar represent in a barcode??
$$ 1 $$
Why does white represent $1$ in barcodes??
White reflects more light.
What does UPC-A stand for??
Universal Product Code Version A
What is UPC-A??
A barcode standard.
What does EAN stand for??
Eurpoen Article Number
What are the two common standards for product barcodes??
- UPC-A
- EAN
What are “Code 128” barcodes used for??
Transport and shipment tracking.
What does the large left number represent??
The manufacturer number.
What does the large right number represent??
The product number.
What is the far right number??
$$ 9 $$
This image contains identical bars at the beginning, middle and end. What are these called??
Guard bars.
Why is the left hand side and the right hand side the exact opposites??
So that the orientation doesn’t matter.
If you have $0010$ on one side of a barcode, what do you have on the other??
$$ 1101 $$
What does $QR$ stand for??
Quick Response
What does $CCD$ stand for??
Charge-Coupled Device
What does $CMOS$ stand for??
Complementary Metal Oxide Semiconductor
What is better: A $CCD$ or $CMOS$??
A $CCD$.
What is a $CCD$ or a $CMOS$??
The sensor in a camera.
What are the two types of camera sensorts??
- CCD
- CMOS
What happens when a camera’s shutter opens??
The light hits the sensor and the light values are represented as binary values.
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Metadata
date: 2020-11-30 13:44
tags:
- '@?computing'
- '@?public'
title: Computing - Input & Output Devices