Video Basics
Video can be defined as the photographic images that are played back at speeds of 15, 25, 30 frames per second and provide the appearance of full motion (see Figure 1). A video consists of a time-ordered sequence of frames (images)
Basics of Digital Audio
The simplest kind of sound wave is a sine wave. Pure sine waves rarely exist in the natural world, but they are a useful place to start because all other sounds can be broken down into combinations of sine waves. Even though such pressure waves are longitudinal, they still have ordinary wave properties and behaviors, such as reflection (bouncing), refraction (change of angle when entering a medium with a different density) and diffraction (bending around an obstacle).
Image compression techniques Image compression is a type of data compression applied to digital images, to reduce their cost for storage or transmission. Data compression refers to the process of reducing the amount of data required to represent a given quantity of information. The reduced file is called the compressed file and is used to reconstruct the image Resulting in the decompressed image is the original image, is called the uncompressed image file.
Arithmetic and Logical Operations on Images (Image Algebra) These operations are applied on pixel-by-pixel basis. So, to add two images together, we add the value at pixel (0 , 0) in image 1 to the value at pixel (0 , 0) in image 2 and store the result in a new image at pixel (0 , 0). Then we move to the next pixel and repeat the process, continuing until all pixels have been visited.
An image must be converted to numerical form before processing. This conversion process is called digitization, and a common form is illustrated in Figure (1). The image is divided into small regions called picture elements, or pixel for short. The most common subdivision scheme is the rectangular sampling grid shown in Figure (1). The image is divided into horizontal lines made up of adjacent pixels. At each pixel location, the image brightness are sampled and quantized. This 15 step generates an integer at each pixel representing the brightness or darkness of the image at that point.
Multimedia is the media that uses multiple forms of information content and information processing (e.g. text, audio, graphics, animation, video, interactivity) to inform or entertain the user. Multimedia also refers to the use of electronic media to store and experience multimedia content. Multimedia is similar to traditional mixed media in fine art, but with a broader scope. The term "rich media" is synonymous for interactive multimedia.