A Technical Introduction to Digital Video by Charles A. Poynton

By Charles A. Poynton

Now not a programming or a recipe ebook, it is a whole reference that offers the elemental thoughts and techniques 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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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). If an input signal has very little noise, then situations can arise when the quantized value is quite predictable at some points, but when the signal is near the edge of a quantizer step, uncertainty in the quantizer is reflected as noise. This situation can cause the reproduced image to exhibit noise modulation.

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). If an input signal has very little noise, then situations can arise when the quantized value is quite predictable at some points, but when the signal is near the edge of a quantizer step, uncertainty in the quantizer is reflected as noise.

Sync structure At a video interface, synchronization (sync) is achieved by associating, with every scan line, a line sync datum denoted 0H (pronounced zero-H). In component digital video, sync is conveyed using digital codes 0 and 255 outside the range of picture information. ” 0H is defined by the 50-percent point of the leading (falling) edge of sync. 94. These equalization pulses have no relationship with the process of equalization that is used to compensate poor frequency response of coaxial cable, or poor frequency or phase response of a filter.

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