By Charles A. Poynton
No longer a programming or a recipe booklet, it is a whole reference that provides the basic thoughts and procedures improvement of electronic video tasks. This booklet is designed for technical humans now not already video specialists who have to layout, construct and program--hardware and software--systems that come with video.
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Extra info for A Technical Introduction to Digital Video
Good use is made in digital systems of what would otherwise be excess data capacity: A digital video interface may convey audio signals during blanking; a digital video tape recorder might record error correction information in these intervals. In a digital video system it is standard to convey samples of the image matrix in the same order that the image information would be conveyed in an analog video system: first the top line (left to right), then the next lower line, and so on. In analog video, information in the image plane is scanned uniformly left to right during a fixed, short interval of time – the active line time – and conveyed as an analog electrical signal.
Disk storage is generally allocated in units integrally related to 1024 bytes; the prefix M applied to disk storage denotes 1 024 000. RAM memory generally has capacity based on powers of two; the prefix M applied to RAM denotes 220 or 1024 K (1 048 576). Data rate of digital video Line rate is an important parameter of a video system: Line rate is simply the frame rate multiplied by the number of lines per total frame. The aggregate data rate is the number of bits per pixel, times the number of pixels per line, times the number of lines per frame, times the frame rate.
From a strictly physical point of view, gamma correction can be thought of as the process of compensating for this nonlinearity in order to achieve correct reproduction of intensity. As explained in Luminance and lightness, on page 81, the human perceptual response to intensity is distinctly nonuniform: The lightness sensation of vision is roughly Copyright © 1996 John Wiley & Sons 91 a power function of intensity. This characteristic needs to be considered if an image is to be coded so as to minimize the visibility of noise and make effective perceptual use of a limited number of bits per pixel.