翻訳と辞書 Words near each other ・ Keystone Building ・ Keystone Building (Aurora, Illinois) ・ Keystone Building (Harrisburg, Pennsylvania) ・ Keystone Camera Company ・ Keystone Canyon ・ Keystone Central School District ・ Keystone Centre ・ Keystone City ・ Keystone Cliffs ・ Keystone College ・ Keystone Cops ・ Keystone Corridor ・ Keystone Cup ・ Keystone Derby Cup ・ Keystone Division (PIHA) ・ Keystone effect ・ Keystone Encores ・ Keystone Exam ・ Keystone Generating Station ・ Keystone Heights Airport ・ Keystone Heights Junior/Senior High School ・ Keystone Heights, Florida ・ Keystone High School ・ Keystone High School (LaGrange, Ohio) ・ Keystone Hook and Ladder Company ・ Keystone Hotel ・ Keystone Hotel (film) ・ Keystone Hotel (Hummelstown, Pennsylvania) ・ Keystone Hotel (Lampasas, Texas) ・ Keystone Ice Miners 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 Keystone effect ： ウィキペディア英語版 Keystone effect The keystone effect, also known as the tombstone effect, is caused by attempting to project an image onto a surface at an angle, as with a projector not quite centered onto the screen it is projecting on. It is a distortion of the image dimensions, such as making a square look like a trapezoid, the shape of an architectural keystone, hence the name of the feature. In the typical case of a projector sitting on a table, and looking upwards to the screen, the image is larger at the top than on the bottom. Some areas of the screen may not be focused correctly as the projector lens is focused at the average distance only. == Theory == The distortion suffered by the image depends on the angle of the projector to the screen, and the beam angle. The distortion (on a two-dimensional model, and for small focus angles) is best approximated by: :$\backslash frac\backslash right)\}\backslash right)\}$ where $\backslash epsilon$ is the angle between the screen axis and the central ray from the projector, and $\backslash alpha$ is the width of the focus. From the formula, it is clear that there will be no distortion when $\backslash epsilon$ is zero, or perpendicular to the screen. 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「Keystone effect」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.