CHAPTER 1 PROBLEM DEFINITION Image compression is the art and science of reducing the amount of data required to represent an image. The purpose for image compression is to reduce the amount of data required for representing sampled digital images and therefore reduce the cost for storage and transmission. Image compression plays a key role in many important applications, including image database, image communications, remote sensing. LZW compression, one of the lossless image compression methods and invented by Abraham Lempel, Jacob Ziv, and Terry Welch, compresses a file into a smaller file using a table-based lookup algorithm. It works best for files containing lots of repetitive data. This is often the case with text and monochrome …show more content…
LZW is an adaptive technique. As the compression algorithm runs, a changing dictionary of (some of) the strings that have appeared in the text so far is maintained. LZW compression is the best technique for reducing the size of files containing more repetitive data. The decompression algorithm always follows the compression algorithm. LZW algorithm is efficient because it don't need to pass the string table to the decompression code. The table can be recreated as it was during compression, using the input stream as …show more content…
Hlavac and J. Fojt?k [11], in 1998, proposed a new method for lossless image compression of grey-level images. The image is treated as a set of stacked bit planes. The compressed version of the image is represented by residuals of a non-linear local predictor spanning the current bit plane as well as a few neighbouring ones. Predictor configurations are grouped in pairs differing in one bit of the representative point only. The frequency of predictor configurations is obtained from the input image. The predictor, as adapts automatically to the image and is able to estimate the influence of neighbouring cells, copes even with complicated structure or fine texture. The residuals between the original and the predicted image are those that correspond to the less frequent predictor configurations. Efficiently coded residuals constitute the output image. Good results were obtained for binary images, grey-level cartoons and man-made
compression ratio and CD- quality sound. An Mp3 file compresses a sound file to one-twelfth its
Lossography is the concept that death can be meaningful based upon cultural values, traditions, and personal beliefs. There are many situations that pertain to the concept of Lossography one particular relation is death education. According to Lossography pertaining to students studies show that students tend to express the issues of death more elaborately through writing (Bolkan, 2015). This is an important aspect of Lossography due to the students being able to express how they feel about death, and be able to express their experiences and cultural beliefs pertaining to a loss loved one. According to the study the most frequent reported death is the loss of a grandparent; many students have encountered the loss of a grandparent at an early
Graphics card – This is a computer hardware that makes up what you see on your monitor. It is essential that you have this hardware for the computer as it converts the data from your CPU, to a signal that makes the monitor understand what you want to see. If you were to have a really good graphics card, then the monitor will appear smoother and sharper. The images is created when the CPU receives the data from the software and then it works together with the graphics card to translate that data to what the monitor can understand. The calculations that the card has to go through, is first to make a wire frame out of the straight lines. Once it has done this it will move on to fill in the remaining pixels also known as rasterising. It would also as the colour, lighting and texture to the image.
In today's world, photographs are the most form of media to deliver news and messages. They depict the mere fact, but are censored to hide violence. Such an act conceals the reality of life and is unfair. Graphic images must always be exposed to the public as they present the blatant reality and educate people about world crisis.
Biorthogonal, Reverse Biorthogonal, Daubechies,and Meyer(dmey).Results provide a good reference for application developers to choose a good wavelet compression system for their application, with this result we conclude that 4-level Haar DWT has better PSNR as compared to 2-level Haar DWT and also provide best quality of image.
Its purpose is to obtain information, analyze it, work it and simplify it necessary to interpret quickly.
Zipping files is a way to compress one or more files so the file size can be crunched down to a smaller size. If you want to send a group of files or large files like videos or high quality photos over the internet, it will take a significant amount of time and will slow you down. Zipping files will make this process a lot easier and faster as sending smaller files will take a shorter amount of
It is a portable storage device that can be attached to a computer through a USB or FireWire connection, or wirelessly. They have high storage capacities and are often used to back up computers or serve as a network
Introduction The use of visual supports in special education has long been a practice in developing individualized educational support systems. Visual supports are tools that are used to increase the understanding of language, environmental expectations, and provide structure and support for individuals with disabilities. Visual supports are flexible enough that they can be provided in a variety of ways, and across multiple settings. Since the rise of inclusive classrooms, students with disabilities have been included in the general education classroom for a portion, if not a majority, of their school day.
Most of the applications in terms of speech and audio compression may seem obvious at first, but what most do not realize is the scale at which it is used. Some of the more common examples include: telephone communications, compact disc players in the form of digital audio coding, stereo sound systems, speech recognition and playback, noise reduction/filtering after voice recognition and speech synthesis [1]. The uses of DSP for speech and audio compression is certainly not limited to these examples, but just these alone are examples that the general public use through various devices on a daily basis often without realizing the function of the systems and processes that go into their operation.
...rams that improve and image by enhancing the contrast, which is the difference in color concentrations. Changing the brightness or dullness of the image. Increasing the resolution and sharpening or de- blurring the image.
As a part of under graduating course I presented my major project on JPEG Encoding and Decoding using MATLAB technology, which included going from a basic grayscale bitmap image all the way to a fully encoded file readable by standard image readers.
JPG: This file extension stands for Joint Photographic Group. Its purpose is to compress digital photographic files. JPG files hold photo's and in particular, digitally produced images, such as online art, photo shopped images, and edited images.
One of the latest advancements in wireless data. It is used in GSM (Global System for Mobile Communications) for transferring data in packets.
Why would you compress audio? Well there is a simple reason to compress digital audio. High quality uncompressed digital audio takes a lot of space (“MP3 Info”). One minute of CD quality uncompressed audio takes around 10 MB of space and would need about 50 minutes to be transferred over a 28.8 modem. So now digital audio tries to compress digital audio so it would take up less space on a person’s computer and have better quality. The larger the compressed file the better the audio quality of the result (“MP3 Info”). ...