Painting or drawing software this software allows the

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Unformatted text preview: uce the storage requirement, images are usually compressed before being stored or transmitted. Image compression techniques are discussed later in this chapter. The area of computer graphics that deals with this type of pictures is known as cognitive graphics. Cognitive graphics along with image processing techniques (like image compression and decompression, cleaning of noisy or blurred images, image editing, etc.) is extensively used in applications that deal with recognition and classification of pictures. For example, an image database containing images of peoples' fingerprints is commonly used nowadays in criminal investigation. Another similar application is classification of images of ECG patterns, X-rays of different parts of the body, etc. to perform medical diagnosis of patients by using computers. Hardware Requirements for Graphics Computer graphics generally involves the following hardware devices (see Chapter 9 for a description of some of these I/O devices): 1. A locating device (such as a mouse, a joystick, or a stylus) attached to a video display terminal along with a drawing software is often used to directly draw pictures on computer screen from scratch for generative graphics applications. 2. A flatbed or rectangular-coordinate digitizer is also used as an input device for generative graphics applications for inputting existing line drawings (such as a map) to a computer. 3. Scanners (optical scanners, image-scan digitizers, etc.) are most commonly used as input devices for capturing photographs and drawings as digital images for cognitive graphics applications. 4. Digital images are also captured directly by a digital camera or a frame capture hardware such as a video capture board interfaced to some standard video source like video camera or video cassette recorder (VCR). 5. Computer screens with graphics display capability are used to display graphics. Standard VGA (Video Graphics Array) graphics can display 640 pixels across and 480 pixels down (referred to as having a...
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This document was uploaded on 04/07/2014.

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