Read e-book online Digital Video: Moving Images and Computers (The Digital PDF

By Ananda Mitra

ISBN-10: 0816067929

ISBN-13: 9780816067923

ISBN-10: 1438134614

ISBN-13: 9781438134611

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Additional info for Digital Video: Moving Images and Computers (The Digital World)

Example text

For example, in 2005 a popular drugstore chain in the United States began selling a disposable video camera for under $30. An analyst who works with the camera industry claimed that nearly 40 percent of all images would be captured using cameras that are disposed after a single use. The devices that display images are therefore an important tool. As explained earlier, the process of digitizing moving images begins with converting the electrical information captured by the CCD into a number that can be stored using the binary system.

A digital video camera that uses DVDs to store the captured moving images usually cannot store more than 60 minutes of video on each disc. Users therefore have to change discs as they capture more video. In 1980, computer scientists such as Leonardo Chiariglione and his colleagues at Telecom Italia’s CSELT research center began developing specific methods of managing digital video file size. The most common way of managing a video file is by artificially reducing the size of the file using a process called compression.

37 38 DIGITAL VIDEO FLASH AS A TOOL FOR IMAGES The quality of the image depends on how much detail is captured in every still image. Professional video cameras with larger CCDs, as discussed earlier, can hold thousands of pixels. That information needs to be instantly recorded on a tape or DVD to ensure that all the information of each still image is held in memory. The process of converting the information of an image and into a digital file eventually produces extremely large files that are difficult to store and manipulate.

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Digital Video: Moving Images and Computers (The Digital World) by Ananda Mitra

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