File:Use of Fourier transformation chest radiography.jpg
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English: The use of the FT and its inverse to remove unwarranted information from an image. (a) An image obtained by adding the sine wave and chest radiography images together with its equivalent Fourier spectrum in (b). The unwanted interference caused by the sinusoidal brightness pattern can be removed by editing the spatial frequency information as shown by the blackened areas in (c). The inverse FT then recovers the original chest image largely undistorted as shown in (d). Further refinement of the editing process would allow complete restoration of the image quality, in theory.
Deutsch: Die Anwendung der FT und ihrer Umkehrfunktion um ungewollte Information aus einem Bild zu entfernen. (a) Das Bild, welches man erhält, wenn man die Sinuskurve und das Bild einer Brustkastenradiographie zusammenführt, sowie sein entsprechendes Fourier-Spektrum in (b). Die ungewollte Interferenz, welche durch die sinusförmigen Helligkeitseigenschaften verursacht wurden, kann durch die Bearbeitung der räumlichen Frequenzinformation entfernt werden, wie es in den geschwärzten Bereichen in (c) zu sehen ist. Die umgekehrte FT entdeckt dann das origniale Brustkastenbild grösstenteils störungsfrei, wie in (d) zu sehen ist. Weitere Verfeinerung des Bearbeitungsprozesses würde idealerweise eine komplette Wiederherstellung der Bildqualität erlauben. |
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| Source | http://en.wikibooks.org/wiki/Image:NM13_10.jpg |
| Author | Generated by Kieran Maher using NIH Image. |
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I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:30, 18 December 2007 | | 614 × 638 (57 KB) | Joschi | {{Information |Description=The use of the FT and its inverse to remove unwarranted information from an image. (a) An image obtained by adding the sine wave and chest radiography images together with its equivalent Fourier spectrum in (b). The unwanted int |
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