Print on demand publishing is a hot topic in recent years. Digital printing technology has changed the traditional publishing mode of printing and selling, reducing the cost of inventory, and also satisfying the publication of professional books with small printing needs, and the reprinting of the collection of ancient books, so that valuable literature can be extended. More people learn from it. Paper is easy to weather, mildew, and locusts. Therefore, the storage conditions of paper books are high. Especially for the long-term collections, if the storage is not good, it may cause cultural loss. Therefore, the relevant organizations have launched digital publishing projects. Digital copying of the value-breaking ancient books is to establish an electronic book database, and to provide on-demand printing services according to market demand.
There are two types of book digitization: photocopying and electronic publishing. Photocopying refers to scanning or photographing a book, generating an image format file, and generating an e-book after image restoration processing. This type of copy book is basically the same as the original version, and the production cost is low. The disadvantage is that content retrieval cannot be performed. Electronic publishing refers to the use of OCR (Optical Character Recognition) technology to convert paper books into original e-books in a variety of formats. Through advanced production process management systems, the error rate of text is controlled within a certain range. , to achieve the level of publishing quality. Electronic publishing books can realize full-text content retrieval, but the procedures are numerous, the process is complicated, and the cost is high. This article will focus on the digital reproduction of photocopying of broken books.
Photocopying data processing procedures include steps such as book scanning, image data processing, file concatenation, and file storage.
First, the book scan
(1) Choosing the right scanning equipment
Scanning is the first and most critical step in data processing. The quality of the original data obtained through scanning determines the quality of the final book. Therefore, we must select the appropriate scanning equipment according to the characteristics of the book, and try to improve the scanning efficiency while ensuring the data quality.
1. For recoverable books, the book is complete, the paper performance is good, and the books of binding, such as line loading, flat binding, and wireless binding, are used, and the automatic scanner is used after the book is opened. The automatic scanner generally has a fast speed. When the parameters are set, the paper can be automatically fed, and about 60 to 80 pages of A4 format are scanned every minute, which greatly saves manpower and time.
2. For non-recoverable books, such as bookbinding, hardcover, and other binding methods, use a zero margin flatbed scanner. Such scanners are relatively slow to scan and have high production costs.
3. Precious rare books or books with serious damage, it is recommended to use a digital camera to take pictures or use a non-contact scanner to obtain images to avoid damage to the books.
(2) Scanning resolution setting
Books printed on demand are typically printed using digital printing equipment . Current number of the digital printing machine is set in the analog line screen has 120lpi, 150lpi, 175lpi, 200lpi etc., for books reprinted, we 175lpi printed output to meet the requirements, therefore, when the input resolution may be set to scan 300 ~ 350dpi.
(3) Other scanning precautions
1. When there are files in the book that are larger in size and beyond the scope of the scanner, they can be divided into several parts. Finally, the software is stitched by Photoshop and other software to form a complete image.
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