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Lenna or Lena is the name given to a standard test image widely used in the field of image processing since 1973. It is a picture of Lena Söderberg, shot by photographer Dwight Hooker, cropped from the centerfold of the November 1972 issue of ''Playboy'' magazine. The spelling "Lenna" comes from the anglicisation used in the original ''Playboy'' article. == History == Before Lenna, the first use of a ''Playboy'' magazine image to illustrate image processing algorithms was in 1961. Lawrence G. Roberts used two cropped 6-bit grayscale facsimile scanned images from ''Playboys July 1960 issue featuring Playmate Teddi Smith (born Delilah Henry), with attribution, in his MIT master's thesis on image dithering. Intended for high resolution color image processing study, the Lenna picture's history was described in the May 2001 newsletter of the IEEE Professional Communication Society, in an article by Jamie Hutchinson: This scan became one of the most used images in computer history. In a 1999 issue of IEEE ''Transactions on Image Processing'' "Lena" was used in three separate articles,〔 and the picture continued to appear in scientific journals throughout the beginning of the 21st century.〔 Lenna is so widely accepted in the image processing community that Söderberg was a guest at the 50th annual Conference of the Society for Imaging Science and Technology (IS&T) in 1997. The use of the photo in electronic imaging has been described as "clearly one of the most important events in () history". To explain Lenna's popularity, David C. Munson, editor-in-chief of ''IEEE Transactions on Image Processing'', noted that it was a good test image because of its detail, flat regions, shading, and texture. However, he also noted that its popularity was largely because an image of an attractive woman appealed to the males in a male-dominated field. While ''Playboy'' often cracks down on illegal uses of its material and did initially send out notices to research publications and journals that used the image, over time it has decided to overlook the wide use of Lena. Eileen Kent, VP of new media at ''Playboy'' said, "We decided we should exploit this, because it is a phenomenon." 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「Lenna」の詳細全文を読む スポンサード リンク
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