Lossy and Lossless Data Compression
As technology improves day in day out, users of multimedia systems expect more detailed and higher quality video images and audio sounds. As part of this report I will be critically evaluating the compression techniques lossy and lossless, which are widely used to compress video and audio. Through this report I will be looking at the following:Applications for high detailed graphics and sound require more and more storage space. A prime example is the internet. The Internet is very diverse, many sites having audio, photo and video galleries. All of which take up a lot of space to store, especially if they have not been compressed. Multimedia systems would also have insufficient bandwidth for the transmission of data.Millions of people use the internet for viewing, downloading and transferring data. The Internet typically provides about 24 to 56KB/second. As images are becoming higher quality it means that downloading an image from the Internet from an uncompressed format e.g. 3MB could take about 7 minutes utilising a high-speed connection of 64KB/second. If the image were compresse
This is done in order to save storage space, or the transmission time for downloading or transferring the data. Whether in home or business, data compression is a vital technique and is used widely to aid many people. It then gets discards any smaller, less significant parts. Being lossy, the compressed image you get from JPEG would have lost quality from the original, but the benefit of JPEG is that you can easily adjust the image to be better quality, although the size of the compression will change. It is based on Discrete Cosine Transformation (DCT) that uses generic mathematical functions; it is used to divide the image into many different parts. Short for Moving Pictures Experts Group, MPEG is another form of lossy compression, since some data is removed although the human eye does not notice the removal of quality. Lossless data compression works by finding repeated patterns in a message and encoding those patterns in an efficient manner. Conclusion:The compression technique used to compress data depends on what the data is. But there are clear benefits why lossless compression can be more beneficial than lossy. How it is used in Industry:MPEG is a working group of the ISO. This is just an example of why compression of data is important. GIF is greatly used on the Internet but only stores 8 bits/pixel, which means that it can only display 256 or fewer distinct colours. For every 1 MB worth of an MP3 file you would get 1 minute worth of audio playback. MPEG in particular is one of the high-tech multimedia standard of the future, and is becoming more advanced and common with the advent of DVD. It is for this reason that lossless compression is also referred to as redundancy reduction.
Common topics in this essay:
Lossless Lossless,
File Format,
,
MP3 MP3,
Transformation DCT,
DTS Conclusion,
Definitions Compression,
Interchange Format,
Lossy Lossy,
MPEG-1 MPEG-2,
lossy compression,
lossless compression,
data compression,
compression technique,
compression ratio,
data lost,
video audio,
lossy lossless,
audio file,
compression techniques,
means data lost,
strings frequently occurring,
inserting strings frequently,
repeated characters inserting,
frequently occurring characters,
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