The purpose of image compression is to represent images with less data in order to save storage costs or transmission time. Without compression, file size is significantly larger, usually several megabytes, but with compression it is possible to reduce file size to 10 percent from the original without noticeable loss in quality. Image compression can be lossless or lossy. Lossless compression means that you are able to reconstruct the exact original data from the compressed data. Image quality is not reduced when using lossless compression. Unlike lossless compression, lossy compression reduces image quality. You can't get the original image back after using lossy compression methods. You will lose some information. [1] Lossless image compression …show more content…
So it reduces the file size without degrading the visual quality. But GIF allows only to use 256 colors so it is not suitable for natural photographs which consist from millions of colors. However, quality can be enhanced by using color dithering. GIF is especially good for artificial images that contain sharp-edged lines and few colors. The compression algorithm that GIF uses was patented in 1985 and the controversy over the patent licensing led to development of the PNG image format. PNG uses also a lossless compression called DEFLATE that uses a combination of the LZ77 dictionary coder and Huffman coding. PNG offers better compression and more features than GIF but it doesn't support animation that GIF does. PNG allows to use millions of colors in pictures. [14-18] TIFF format is a flexible and adaptable file format. It can store multiple images in a single file. You can choose which compression algorithm to use. TIFF can be used as a container for JPEG or you can choose to use lossless compression such as RLE or LZW. Because TIFF supports multiple images in a single file, multi-page documents can be saved as single TIFF file rather than as a series of files for each scanned page.
Furthermore, compression techniques that fall into two categories: lossless (reversible, no data loss) and lossy (irreversible, greater data reduction). Effective compression is best achieved with a combination of data reduction techniques such as bit rate reduction and compression. The difference is that bit rate reduction eliminates unnoticeable data, and compression removes unnecessary and excessive data through mathematical algorithms. Due to different forms of redundancy and the fact that the human visual system is unable to detect certain details, information can be altered or removed causing changes that are imperceptible to the human eye or brain.
compression ratio and CD- quality sound. An Mp3 file compresses a sound file to one-twelfth its
the mean value and the standard deviation, to represent the global characteristics of the image, and the image bitmap is used to represent the local characteristics of the image for increasing the accuracy of the retrieval system. Aptoula et al. [8] presen...
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.
In the animation world this is good because they are always editable and a high quality can be made instantly. Because of their very large size it’s important to compress the final product to a bitmap format.
Animations is simulation of movement created by displaying a series of pictures, or frames. Cartoons on television is one example of animation. Animation on computers is one of the chief ingredients of multimedia presentations. There are many software applications that enable you to create animations that you can display on a computer monitor.
The word steganography comes from the Greek name “steganos” which means hidden or secret, and the word graphy, which means writing or drawing. Put them together, and it literally translates to mean “hidden writing” (Richer, 2010). According to Dictionary.com, steganography is “the art of writing in cipher, or in characters, which are not intelligible except to persons who have the key; cryptography.” In the modern use of the word, steganography means the practice of hiding messages within larger messages so that others cannot detect what the message contains, or even that the message is there. It replaces redundant bits in images or other media with secret information from the hidden message. The redundant bits are used because they can be changed without making a noticeable change in the image or sound file.
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
An MP3 is a recorded high-quality audio (voice and music) file which can be distributed over the Internet, and played on any multimedia computer with the right sound card and speakers. MP 3 is simply a file format that compresses a song into a smaller size so it is easier to move around on the Internet and store. MPEG is the acronym for Moving Picture Experts Group. This group has developed compression systems used for video data. For example, DVD movies, HDTV broadcasts and DSS satellite systems use MPEG compression to fit video and movie data into smaller spaces. The MPEG compression system includes a subsystem to compress sound, called MPEG audio Layer-3. We know this as MP3.
Computer generated images, has about 7 components, that we know of, as of now, and may be more that build up to CGI, but there might be a advancement later on in the next couple of year that lead to more components that help us advance in CGI. The big components that CGI is know to have , the components that I know of, as of now are statistic images and landscapes, archetectural scenes, anatomical models, generating cloth and skin images, computer animation, and virtual worlds, and I will be deconstructing them or breaking them down into finer details.
Image intensification is the process of converting x-ray into visible light. “Early fluoroscopic procedures produced visual images of low intensity, which required the radiologist's eyes to be dark adapted and restricted image recording. In the late 1940s, with the rapid developments in electronics and borrowing the ideas from vacuum tube technology, scientists invented the x-ray image intensifier, which considerably brightened fluoroscopic images” (Wang & Blackburn, 2000, np). We will explore the image-intensification tube, the various gain parameters associated with the tube, and the magnification mode of the image intensifier.
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.
Digital cameras generally include specialized digital image processing hardware – either dedicated chips or added circuitry on other chips – to convert the raw data from their image sensor into a color-corrected image in a standard image file format. Images from digital cameras can be further processed to improve their quality or to create desired special effects. This additional processing is typically executed by special software programs that can manipulate the images in a variety of ways.
Society has increasingly placed a high value on image, which has had a profound effect on people, from how to dress, talk, behave, things they idolize, or deem important. Image is a physical likeness, representation, or appearance of a person, or thing, photographed, painted, or otherwise made visible. Image is one of the oldest form of nonverbal communication used to appeal to others; people often judge your integrity, accountability, or professionalism based on appearance. Having the right image can go a long way, by providing opportunities, highlight qualities, and even present life changing experiences. Image is how someone, a group, or corporation, present themselves to the world, it tells a little about who they are. Therefore, image gives an insight to spectators, who form opinions solely on appearances, which is very important as first impressions last.
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”). ...