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Data Compression | CG | Computer Graphics | Lec-64 | Bhanu Priya – Transcript
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- Data compression is a function of the presentation layer in the OSI reference model.
- Data compression is defined as the art of representing information in a compact form.
- Data compression involves two main components which are the encoding algorithm and the decoding algorithm.
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Hi students welcome back now coming to the next topic in the subject computer graphics is data compression data compression so what it means you're compressing the data means you're reducing the size of the file without affecting the original file okay you're so far you had seen the zip files so the zip file it's just compressing file if you're having this so much of large file if you want to
send that file to any person you need to compress otherwise you can't send that much of large file to and the file through internet okay so that is a data compression now let's see what is exactly it is a data compression is a function of presentation layer in a OSI it's just the OSI reference model it's just a function of presentation layer the presentation layer is
going to do this data compression a compression is often used to maximize the use of bandwidth across okay first it is used to maximize the use of bandwidth use of bandwidth across a network
or to optimize disk space to optimize means to reduce the disk space optimize disk space when saving data so for this the compression is used to maximize the use of bandwidth over the network and to optimize the disk space so what exactly the data
compression is let me explain you what is data let me write DC data compression what is data compression the definition of data compression is the art of representation of information in a
compact form means it's a small form in a compact form is called data compression just it is an art of representing an information in a compact form so what type of information you're using how much size your information is means the data is it's just representing
in a compact form is called data compression so these representations are created by identifying and using the structures in the data so that you have to be remembered okay I said the data compression is nothing but it's an art of representation of information in a compact form
actually why we require this data compression why is it necessary why is data compression okay so we are using why the data compression is required means for the sake of storage
and for the sake of data transmission okay so why we required data compression means for the sake of storage and for the sake of data transmission suppose storage how this data compression will be used. The data compressions reduce the size of the file, reduce the size
of a file. To reduce the storage space required to store the particular file it has to reduce the size of the file. Then what about the data transmission? So how this data compression is used for the sake of data transmission. It saves the time. That is required in transmitting
file. That is required in transmitting file. So for these two reasons we are using the data compression for storage and for data transmission. Actually the data compression involves two
main components. Generally the data compression involves two main components. What are the two main components? The two main components are encoding algorithm and decoding algorithm.
Encoding algorithm and decoding algorithm. So for every if you want to compress the original if you are using the data compression technique on any file you need encoding algorithm for compress the data and to deactivate means the compressed data you need the decoding algorithm.
Actually this encoding algorithm takes a message whatever the message or a file that is there it takes a message and generates a compressed representation of that message.
So whatever the message that is there that should be compressed in encoding algorithm. What about the decoding algorithm? What this decoding algorithm will do? This decoding algorithm reconstruct the original message. Reconstruct the original message or some approximate of it from the compressed representation. So these are the main two components that
are involved in the data compression. So I hope you understand what exactly the data compression is. If you want to save the storage means if you want to reduce the size of the storage and if you want to transfer the data for data transmissions we are using the data compression. Actually this data compression is an art of representation of information in a compact form. So in the next video I will explain the different data compression techniques
or the methods. How the data is compressed by using different techniques. How it is going to be saved the storage means reduce the size of the storage size of the file and how the files are transmitting to save the time. Thank you.