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Shahriar Akramullah's Digital Video Concepts, Methods, and Metrics: Quality, PDF

By Shahriar Akramullah

ISBN-10: 1430267135

ISBN-13: 9781430267133

Electronic Video strategies, equipment, and Metrics: caliber, Compression, functionality, and gear Trade-off research is a concise reference for execs in a variety of functions and vocations. It specializes in giving the reader mastery over the recommendations, equipment and metrics of electronic video coding, in order that readers have enough figuring out to decide on and track coding parameters for max effects that will go well with their specific wishes for caliber, compression, velocity and power.

The functional facets are many: importing video to the net is just the start of a pattern the place a shopper controls video caliber and pace through buying and selling off a variety of different components. Open resource and proprietary purposes equivalent to video email, inner most occasion content material iteration, modifying and archiving, and cloud asset administration could supply additional keep an eye on to the end-user.

Digital video is usually compressed and coded for simpler garage and transmission. This technique includes visible caliber loss as a result of common information compression innovations and calls for use of excessive functionality computing platforms. A cautious stability among the volume of compression, the visible caliber loss and the coding pace is important to maintain the whole process price down, whereas providing an excellent consumer adventure for numerous video purposes. even as, strength intake optimizations also are necessary to get the activity performed on reasonably cheap shopper platforms.

Trade-offs could be made between those elements, and suitable concerns are relatively very important in resource-constrained low energy units. to higher comprehend the trade-offs this e-book discusses a finished set of engineering ideas, innovations, equipment and metrics. It additionally exposes readers to ways on tips to differentiate and rank video coding strategies.

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Also, the artifacts are dependent on nature of the content and the viewing condition. • Effect of multi-generational coding: Applications such as video editing may need multiple generations of coding and decoding, where a decoded output is used as the input to the encoder again. The output from the encoder is a second-generation compressed output. Some applications support multiple such generations of compression. Some compression algorithms are not suitable for multi-generational schemes, and often result in poor quality after the second generation of encoding the same frame.

Figure 2-12 shows an example of reduction of information using motion compensation from one video frame to another. Figure 2-12. An example of reduction of informataion via motion compensation 34 Chapter 2 ■ Digital Video Compression Techniques The prediction and reconstruction process is lossless. However, it is easy to understand that the better the prediction, the less information remains in the difference signal, resulting in a higher compression. Therefore, every new generation of international video coding standards has attempted to improve upon the prediction process of the previous generation.

Important Parameters in ITU-R Digital Video Studio Standards Standard Parameter Value BT. 5 MHz sampling frequency: 60 field/s: 858 × 720 50 field/s: 864 × 720 4:4:4, 18 MHz sampling frequency: 60 field/s: 1144 × 960 50 field/s: 1152 × 960 4:2:2 systems have appropriate chroma subsampling. 001 Scan mode Progressive Coding format 10 or 12 bits per component BT. 709 BT. 2020 28 Chapter 2 ■ Digital Video Compression Techniques Chroma Subsampling As mentioned earlier, the HVS is less sensitive to color information compared to its sensitivity to brightness information.

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Digital Video Concepts, Methods, and Metrics: Quality, Compression, Performance, and Power Trade-off Analysis by Shahriar Akramullah

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