INPUT DEVICES Mice and Trackballs Mice All Macintosh computers require mice and most modern PCs use them.Multimedia applications make extensive use of point and click interactions.A remote mouse can be useful for multimedia presentations. This device uses infra-red technology which allows the user to operate the computer by pointing the mouse at the screen while moving freely around the room.
INPUT DEVICES Mice and Trackballs Trackballs Trackballs are sometimes a preferable alternative to mice in small confined environments and are common in laptop computers
INPUT DEVICES Touch Screens Are particularly suited to kiosks applications for multimedia. They are simple to use, by touching the part of screen, and are suited for use by members of the general public.They also offer physical security as the other contents of the system can be hidden behind the locked doors of a cabinet.
INPUT DEVICES Touch Screens There are two main touch screen technologies:The screen is covered with a textured coating that is sensitive to pressure and registers the location of the user’s finger when it touches the screenA framework of invisible beams of infra-red criss-cross in front of the screen and calculate where the finger has pressed.
INPUT DEVICES Graphics Tablets Provide a more precise input device than mice and trackballs.They provide considerable control and are often used be graphic artists to edit finely detailed graphics.A special pen is used against the pressure sensitive surface of the tablet and this in turn causes the cursor to move on the screen.
INPUT DEVICES Scanners Scanners are particularly useful in the development o multimedia as they convert existing artwork such as cartoons and photographs into electronic images and avoid the need to create original images.There are 2 types of scanners:Flat-bed scanners - which provide images of up to 300 or 600 dot per inch (dpi) in color gray-scaleHand-held scanners – which are more limited and are typically only used for small images and columns of text.
INPUT DEVICESFlat-bed ScannerHand-held Scanner
