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Book scanning (or magazine scanning) is the process of converting physical books and magazines into digital media such as images, electronic text, or electronic books (e-books) by using an image scanner. Digital books can be easily distributed, reproduced, and read on-screen. Common file formats are DjVu, Portable Document Format (PDF), and Tagged Image File Format (TIFF). To convert the raw images optical character recognition (OCR) is used to turn book pages into a digital text format like ASCII or other similar format, which reduces the file size and allows the text to be reformatted, searched, or processed by other applications. Image scanners may be manual or automated. In an ordinary commercial image scanner, the book is placed on a flat glass plate (or platen), and a light and optical array moves across the book underneath the glass. In manual book scanners, the glass plate extends to the edge of the scanner, making it easier to line up the book's spine. Other book scanners place the book face up in a v-shaped frame, and photograph the pages from above. Pages may be turned by hand or by automated paper transport devices. Glass or plastic sheets are usually pressed against the page to flatten it. After scanning, software adjusts the document images by lining it up, cropping it, picture-editing it, and converting it to text and final e-book form. Human proofreaders usually check the output for errors. Scanning at () is adequate for conversion to digital text output, but for archival reproduction of rare, elaborate or illustrated books, much higher resolution is used. High-end scanners capable of thousands of pages per hour can cost thousands of dollars, but do-it-yourself (DIY), manual book scanners capable of 1200 pages per hour have been built for US$300.〔(【引用サイトリンク】title=DIY High-Speed Book Scanner from Trash and Cheap Cameras )〕 ==Commercial book scanners== Commercial book scanners are not like normal scanners; these book scanners are usually a high quality digital camera with light sources on either side of the camera mounted on some sort of frame to provide easy access for a person or machine to flip the pages of the book. Some models involve V-shaped book cradles, which provide support for book spines and also center book position automatically. The advantage of this type of scanner is that it is very fast, compared to the productivity of overhead scanners. 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「Book scanning」の詳細全文を読む スポンサード リンク
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