Download e-book for kindle: A Technical Introduction to Digital Video by Charles A. Poynton

By Charles A. Poynton

No longer a programming or a recipe booklet, this can be a entire reference that offers the basic innovations and methods improvement of electronic video initiatives. This e-book 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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Theoretically a pure power function suffices for gamma correction; however, the slope of a pure power function is infinite at zero. In a practical system such as a television camera, in order to minimize noise in the dark regions of the picture it is necessary to limit the slope (gain) of the function near black. Rec. 018, and stretches the remainder of the curve to maintain func102 A TECHNICAL INTRODUCTION TO DIGITAL VIDEO tion and tangent continuity at the breakpoint. In this equation the red tristimulus (linear light) component is denoted R, and the resulting gamma-corrected video signal is denoted with a prime symbol, R’709.

750 kHz. 734 kHz. Details are in Field, frame, line, and sample rates, on page 199. All 525-line broadcast signals – even monochrome signals – now employ this rate. 625 kHz, corresponding to a line time of exactly 64 µs. Data rate b = bit B = Byte 103 210 k K 1000 1024 SI, datacom: M 106 1 000 000 disk: M 103 · 210 1 024 000 RAM: M 220 1 048 576 Data rate of a digital system is measured in bits per second (b/s) or bytes per second (B/s), where a byte is eight bits. The formal, international designation of the metric system is Système International d’Unités, SI.

SNR is expressed in units of decibels (dB), a logarithmic measure. Sensitivity refers to the minimum signal power that achieves acceptable (or specified) SNR performance. Quantization To make a 50-foot-long fence with fence posts every 10 feet you need six posts, not five! Take care to distinguish levels (here, six) from steps (here, five). Theoretical SNR for an k-step quantizer: 20 log 10 (k 12 ) A signal whose amplitude takes a range of continuous values is quantized by assigning to each of a finite set of intervals of amplitude a discrete, numbered level.

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