What is different Steganography Technique in Image Steganography?
Computer Graphics , Cyber Security / June 19, 2018

Steganography is the idea of hiding private or sensitive data or information within something that appears to be nothing out of the normal. The word steganography comes from the Greek Steganos, which mean covered or secret and –graphy mean writing or drawing. Therefore, steganography means, literally, covered writing Over the past few years, numerous steganography techniques that embed hidden messages in multimedia objects have been proposed. Different Techniques There have been many techniques for hiding information or messages in images in such a manner that the alterations made to the image are perceptually indiscernible. Common approaches are including: Figure 1 Different Steganography Technique Least Significant Bit (LSB) Least significant bit (LSB) insertion is a common, simple approach to embedding information in a cover image. The least significant bit (in other words, the 8th bit) of some or all of the bytes inside an image is changed to a bit of the secret message. When using a 24-bit image, a bit of each of the red, green and blue colour components can be used, since they are each represented by a byte. In other words, one can store 3 bits in each pixel. An 800 × 600 pixel image, can thus store…

What is Multimedia Communication in Computer Graphics?

Multimedia communication deals with the transfer, the protocols, services and mechanisms of discrete media data (such as text and graphics) and continuous media data (like audio and video) in/over digital networks. Multimedia systems have attracted much attention during the last few years in the society as a whole and in the information technology field in particular. Multimedia communication comprises the techniques needed for distributed multimedia systems. To enable the access to information such as audio and video data, techniques must be developed which allow for the handling of audiovisual information in computer and communication systems Basic Overview of Multimedia Communication Multimedia is everywhere as a communication method to educate, inspire, and encourage people through several digital forms like photography, video, illustration, animation, audio, text, interactive websites and engaging environments. Expressive and talented people with digital communication skills have the desirable job skills that employers are seeking including analytical thinking, creative problem solving, and working collaboratively. Our multimedia communication degrees are designed to balance artistic technique and technical proficiency with professional competency in print, web, and social media applications. Visual literacy, creativity, and collaboration are integrated into a curriculum that teaches you how to develop digital media content that responds to…

What is Graphics Rendering in Computer Graphics?

Computer generated images by default render the entire scene in perfect focus. The desire to render the world around us is common to many applications. As part of this ‘virtual world’ it is natural to include representations of humans. A realistic visual approximation of a human requires a polygon mesh of significant complexity, especially as it has to be sufficiently tessellated to allow smooth deformations of the model. Image-based modeling and rendering techniques have recently received much attention as a powerful alternative to traditional geometry-based techniques for image synthesis. Instead of geometric primitives, a collection of sample images are used to render novel views. Definition of Rendering Graphics Graphics Rendering is the process of generating an image from a model, by means of a software program. The model is a description of three dimensional objects in a strictly defined language or data structure. It would contain geometry, viewpoint, texture and lighting information. The image is a digital image or raster graphics image. The term may be by analogy with an “artist’s rendering” of a scene. ‘Rendering’ is also used to describe the process of calculating effects in a video editing file to produce final video output. It is one of…

What is Virtual Reality in Computer Graphics?

Virtual Reality is a major asset and aspect of our future. It is the key to experiencing, feeling and touching the past, present and the future. It is the medium of creating our own world, our own customized reality. Modeling is used to build structures that serve as proxies for other objects. Virtual reality is more than just interacting with 3D worlds. By offering presence simulation to users as an interface metaphor, it allows operators to perform tasks on remote real worlds, computer generated worlds or any combination of both. The simulated world does not necessarily have to obey natural laws of behavior. Such a statement makes nearly every area of human activity a candidate for a virtual reality application. However, we can identify some application areas were benefits are more straightforward than others. Overview of Virtual Reality A virtual reality system is essentially an interactive simulation that can represent a real or abstract system. Virtual Reality (VR) is the use of computer graphics and other technologies to create a simulated environment in which the user interacts.  While computer graphics supplies the visual component of the experience via a normal screen, a stereoscopic display, or head‐mounted technology; a variety of other devices…

What is Multimedia Database in Computer Graphics?

The exponential growth of the technological advancements has resulted in high-resolution devices, such as digital cameras, scanners, monitors, and printers, which enable the capturing and displaying of multimedia data in high-density storage devices. Furthermore, more and more applications need to live with multimedia data. However, the gap between the characteristics of various media types and the application requirements has created the need to develop advanced techniques for multimedia data management and the extraction of relevant information from multimedia databases. At the heart of multimedia information systems lies the multimedia database management system. Everyone deals with multimedia at every walk of lives. We work with multimedia and are surrounded by multimedia. Due to the advancement of modern computer and information technology, multimedia systems play more and more impact on our lives. Overview of Multimedia Database Multimedia database is a kind of database like any other databases containing multimedia collections. Multimedia is defined as the combination of more than one media, they may be of two types–static and dynamic media. Text, graphics, and images are categorized as static media; on the other hand, objects like- animation, music, audio, speech, video are categorized as dynamic media. Graphic images may consist of cliparts, photographs,…

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