翻訳と辞書 Words near each other ・ Sumanth ・ Sumanth Art Productions ・ Sum (Unix) ・ Sum 41 ・ Sum 41 discography ・ Sum activity of peripheral deiodinases ・ Sum addressed decoder ・ Sum Alahi Mong ・ Sum and Product Puzzle ・ Sum and Substance ・ Sum certain ・ Sum Elai-Mang ・ Sum frequency generation spectroscopy ・ Sum Mo Chikan ・ Sum of absolute differences ・ Sum of absolute transformed differences ・ Sum of angles of a triangle ・ Sum of Christianity ・ Sum of Logic ・ Sum of normally distributed random variables ・ Sum of Parts ・ Sum of perpetuities method ・ Sum of public power ・ Sum of radicals ・ Sum of squares ・ Sum of the Parts ・ Sum of two squares theorem ・ Sum Practysis of Medecyne and other Short Works ・ Sum rule ・ Sum rule in differentiation Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Sum of absolute transformed differences ： ウィキペディア英語版 Sum of absolute transformed differences The sum of absolute transformed differences (SATD) is a widely used video quality metric used for block-matching in motion estimation for video compression. It works by taking a frequency transform, usually a Hadamard transform, of the differences between the pixels in the original block and the corresponding pixels in the block being used for comparison. The transform itself is often of a small block rather than the entire macroblock. For example, in x264, a series of 4×4 blocks are transformed rather than doing the more processor-intensive 16×16 transform. ==Comparison to other metrics== SATD is slower than the sum of absolute differences (SAD), both due to its increased complexity and the fact that SAD-specific MMX and SSE2 instructions exist, while there are no such instructions for SATD. However, SATD can still be optimized considerably with SIMD instructions on most modern CPUs. The benefit of SATD is that it more accurately predicts quality from both the standpoint of objective and subjective metrics. As such, it is often used in video compressors, either as a way to drive and estimate distortion explicitly, such as in the Theora (since 1.1 alpha2) encoder, as an optional metric used in wide motion searches, such as in the Microsoft VC-1 encoder, or as a metric used in sub-pixel refinement, such as in x264. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sum of absolute transformed differences」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.