A Technical Introduction to Digital Video by Charles A. Poynton

By Charles A. Poynton

Now not a programming or a recipe booklet, this can be a whole reference that provides the basic techniques and tactics improvement of electronic video tasks. This ebook 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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Digital television services are already deployed in direct broadcast satellite (DBS) systems and are expected soon in cable television (CATV). 94 and 625/50 component video have been proposed and even standardized. In studio analog systems, widescreen is accomplished by having the active picture represent 16:9 aspect ratio, but keeping all of the other parameters of the video standards. Unless bandwidth is increased by the same 4⁄ 3 ratio as the increase in aspect ratio, horizontal detail suffers.

Luminance codes above 100 suffer no artifacts due to visibility of the jumps between codes. However, as the code value increases toward white, the codes have decreasing perceptual utility. 5 percent, well below the threshold of visibility. Codes 200 and 201 are visually indistinguishable: Code 201 is perceptually useless and could be discarded without being noticed. 2 in the margin, shows that a linear-luminance representation is a bad choice for an 8-bit channel. In an image coding system, it is sufficient, for perceptual purposes, to maintain a ratio of luminance values between adjacent codes of about a 1 percent.

The degree of visual impairment caused by noise in a video signal is a function of the properties of vision. 45power function, of physical (linear-light) intensity. The function chosen minimizes the visibility of noise. The effect of quantizing to a finite number of discrete amplitude levels is equivalent to adding quantization noise to the ideal levels of a quantized signal. Quantization has the effect of introducing noise, and thereby diminishes the SNR of a digital system. Eight-bit quantization has a theoretical SNR limit of about 56 dB (peak signal to rms noise).

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