# Data Compression Techniques Ppt

File structure is an organization for data on peripheral storage, such as a disk drive. The main aim of the field of data compression is of course to develop methods for better and better compression. SlideShare Explore Search You.

The set of symbols is then divided into two subsets that have the same probabilities. You will not be able to hear the flute any more. You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later. Given five symbols with probabilities as shown in Figure.

Experience shows that fine tuning an algorithm to squeeze out the last remaining bits of redundancy from the data gives diminishing returns. Another problem with dictionary compression of images is that such methods scan the image row by row, and may thus miss vertical correlations between pixels.

In lossy compression some information is lost during the processing, where the image data is stored into important and unimportant data. Data Compression - What we can do is to compress the data so that we send far fewer bits. Here the reconstructed image is mathematically and visually identical to the original one. Visually lossless compression is based on knowledge about colour images and human perception.

## Data Compression Techniques

Each pixel can be either one bit indicating a black or white dot or several bits indicating one of several colours or shades of gray. They are arranged in the descending order of the probabilities.

The important basic techniques are run length encoding and move to front encoding. Lossless compression will typically not compress file as much as lossy compression techniques and may take more processing power to accomplish the compression. What is Bit Block Transfer? Receive all seminar updates via Facebook. The method starts by building a list of all the alphabet symbols in descending order of their probabilities.

Currently the best archiver. In this type of compression no information is lost during the compression and the decompression process. Zero bits are allocated to the frequency ranges that are totally masked. They are encoded by variable size codes and are written on the compressor. Shannon-Fano Example Prob.

So, a run-length encoding scheme can take each line and transmit a code for while then the number of pixels, then the code for black and the number of pixels and so on. We assume that this pixels are stored in an array called bitmap in the memory. Traditional methods are therefore unsatisfactory for image compression, so we turn on to novel approaches. Many of them are also animated.

Dictionary-based compression methods also tend to be unsuccessful in dealing with continuous-tone images. The system then discards the unimportant data. Most of the presentations and slideshows on PowerShow. Most faxes are white sheets with the occasional black text.

Image compression is based on the fact that neighbouring pixels are highly correlated. Notice that digitizing sound involves the same two steps, with the difference that sound is one-dimensional.

## Data compression techniques Seminar Report PPT in PDF and DOC Format

Although it has no power enforcement, the standards it recommends are generally accepted and adopted by industry. Data compression seems useful because it delays this inevitability. Now customize the name of a clipboard to store your clips.

Data compression is the process of converting an input data stream or the source stream or the original raw data into another data stream that has a smaller size. Statistical methods work best when the symbols being compressed have different probabilities. For example, imagine that you are broadcasting a live flute concert and all of a sudden someone starts striking a hammer on a metal sheet. Index Compression - See Scholer et al. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world.

The second subset is divided in the second step, into two symbols and three symbols. They are all artistically enhanced with visually stunning color, shadow and lighting effects. What is Bitmapped Display? If you continue browsing the site, spanish learning tutorials you agree to the use of cookies on this website.

What is Object-oriented Graphics? What is analogue or analog video? What is Bitmap and Bitmap Editor?

There is truly something for everyone! The fact that the viewer is willing to accept this loss suggests that further loss of information night be tolerable if done properly.

Reduction of amount of **data** based on removal of redundant **data** - What is Image Compression? There are many known methods of data compression. Lossy Compression Lossy compression is the one that does not promise that the data received is exactly the same as data send i. Lossless and Lossy Compression Techniques.

Lossless and Lossy Compression. You can change your ad preferences anytime. When a subset contains just two symbols their codes are distinguished by adding one more bit to each. This is best illustrated by an example.

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