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Réseau plate : ウィキペディア英語版 | Réseau plate A Réseau plate is a transparent plate with fiduciary markers placed at the focal plane of a camera just in front of the film to provide a means of correcting images to enable them to be used for precision measurement. The crosshairs visible in photos taken on the Moon are an example of this usage. The term originates from the French word meaning "network". ==Description== Potential distortions include the incorrect position of the film in the camera, the distortions of the film by the development process, and (if digitally scanned) the nonlinearity of the image scanner. These errors may be visually imperceptible but limit the precisions of measurements. Because the position of the marks is very precisely known, the image can easily be corrected to account for these effects. When used for photogrammetry, multiple images can be combined using the fiducial marks and knowledge of the camera geometry to enable measurement of distances between objects in the images.〔(【引用サイトリンク】url=http://www.clavius.org/photoret.html )〕
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「Réseau plate」の詳細全文を読む
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