Skip to main content

Lossy Compression


Lossy compression is a data compression method. It produces a close match of the data after decompression. The lossy compression method eliminates some amount of data that is not noticeable. this technique does not allow a file to restore in its original form but significantly reduces the size. It is beneficial if the quality of the data is not your priority. It slightly degrades the quality of the file or data but is convenient when one wants to send or store the data. It is used to store audio signals, images and videos. The data holding capacity of channel is more than the lossless method. 

The application of the lossy compression are the following:
JPEG, GUI, MP3, MP4, OGG, H-264, MKV, etc.

Lossy Compression Technique
  1. Transform Coding: This method transforms the pixels which are correlated in a representation into disassociated pixels. The new size is usually less than the original size and reduces the redundancy of the representation.
  1. Discrete Cosine Transform (DCT): This is the most vastly used image compression technique. JPEG process centre around DCT. DCT process divides the image into distinct parts of frequencies. In the quantization step, where compression basically occurs least important frequency are rejected. And the critical frequencies are retained so that the image can be obtained in the decompression process. The reconstructed image could contain some distortion.
  2. Discrete Wavelet Transform (DWT): It provides a location of time and frequencies simultaneously and can be utilised in decomposing a signal into component wavelets.

Some more related topics:

Labels:

Comments

Post a Comment

Popular Post

Competitive Advantage - Sustainable Competitive Advantage

Sustainable competitive advantage may be realised by adoption of e-commerce strategies and business models. Rather than simply exchanging procurement transactions as with e-commerce practices, leading enterprises are executing e- commerce to share intellectual capital with their trading partners working as a value chain that provides a competitive advantage for the development and distribution of their products. The idea of giving the customer access to tracking information via the internet was a new one that had considerable appeal to the customer. For example , the use of new system also had considerable advantage to FedEx who no longer had to deal with a vast number of calls checking up on progress of consignment; because the customer could now access the system themselves. But e-commerce development and implementation could not be entirely private- customer had to become involved at some stage. The competitor was quick to catch on to the idea and UPS (United Parsal Services) was so...
Post a Comment
Read more

E-Commerce Implementation

The strategy diagram divides implementation into the technical and the business aspects and these are briefly considered below: Technical Implementation : The approach to technical implementation of an E-Commerce system depends on the business objectives, business requirements and technologies that have been selected. It is noted that many internet E-Commerce systems are cobbled(repaired) together rather than designed and that is often apparent. It is important that the design process considers: Is of use of system by intended end-users : Always an important factor in system design but crucial if the end user are to be members of the public with perhaps limited computer literacy and the option to switch to an alternative website if not satisfied. Functionality that users need : This has to be what the users want rather than what the organisation things they need. Uses of e-commerce are not a captive audience that can be interviewed and evaluated like the uses of a traditional IS develo...
Post a Comment
Read more

Electronic commerce introduction

Electronic Commerce ( e-commerce ) generally refers to all forms of transactions relating to commercial activities, involving both organizations and individuals that are based upon the processing and transmission of digitised data, including text, sound and visual images. E-Commerce has created a new environment in business transactions using internet. It deals with providing information to consumers regarding products of their interest. It provides a platform of advertisement of products, allows negotiations, order for raw materials, settlement of financial transactions etc. Electronic commerce is an integrations of communication services, data management and security mechanisms that allows organizations to exchange information about the sale of goods and services, where, Communication services supports the transfer of information from the buyer to the seller electronically. Data management is the exchange and storing of data in a uniform format to facilitate easy exchange of infor...
Post a Comment
Read more