By Ben Waggoner
ISBN-10: 0240812131
ISBN-13: 9780240812137
This ebook is in no way an introductory textual content. to know nearly all of the fabric, one should be previous the newbie point in figuring out compression. Waggoner is writing to those that already comprehend quite a lot approximately compression, although i am not so convinced that he realizes that. that frequently occurs whilst a author is aware an issue so good that he has forgotten what it really is prefer to recognize little of the topic, and so his reasons suppose even more than the uninitiated reader is aware. instance: there are lots of abbreviations for a myriad of compression phrases. So when you do not know what these abbreviations suggest, this can be very difficult to keep on with alongside. or even in the event you knew what all these letters and numbers stood for, within the textual content of the e-book, Waggoner doesn't clarify them to the place a newbie could comprehend them.
To make concerns worse, a thesaurus used to be promised within the creation of the booklet, yet there's none to be stumbled on. My replica has a host of clean pages the place the thesaurus should still be!
I am yes that this can be a really good textual content should you already comprehend compression, yet novices might want to cross somewhere else to get the fundamentals, after which use Waggoner's reference textual content to excellent their wisdom. to make certain, when you are capable of wade through the publication, it is going to supply even a newbie "a experience" of what's happening. yet, as person who has just a mild realizing of compression, i used to be hoping for reasons that i'll grasp.
And with a bit of luck your reproduction will include the promised word list.
Read Online or Download Compression for Great Video and Audio, Second Edition: Master Tips and Common Sense (DV Expert) PDF
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Extra resources for Compression for Great Video and Audio, Second Edition: Master Tips and Common Sense (DV Expert)
Sample text
Taken to the next level, the order of letters is also not random. ” So a coding scheme can be expanded to take account of the probability of a particular letter given previous letters, assign symbols to a series of letters instead of a single one, or having a different codebook based on past letters. Codebooks can be agreed upon in advance, so the decoder knows how to best decode the content in question. Multiple codebooks can be used, with a code at the start of the file or even changing throughout the file to indicate which codebook is to be used.
Shannon’s grad student David A. Huffman devised a method for generating an optimal codebook for a particular set of content (for a term paper, no less). Huffman coding uses shorter codes for more common symbols and longer codes for less common ones. Different codebooks work better or worse for different kinds of content. A codebook for English won’t work well for Polish, which has a very different distribution of letters. For an English codebook, the Polish distribution of letters would require more bits to encode, possibly even more bits than the uncompressed original file.
Quantization Errors Quantization (quant) errors arise from having to choose the nearest equivalent to a given number from among a limited set of choices. Digitally encoding colors inevitably introduces this kind of error, since there’s never an exact match between an analog color and its nearest digital equivalent. The more gradations available in each channel—that is, the higher the color depth—the closer the best choice is likely to be to the original color. For 8-bit channels that don’t need much processing, quantization error doesn’t create problems.
Compression for Great Video and Audio, Second Edition: Master Tips and Common Sense (DV Expert) by Ben Waggoner
by James
4.4