对PDF文档的认识与应用探讨

在当今的计算机世界里,Microsoft Word的Doc格式和Adobe Acrobat的PDF格式是使用率最高的两种文档格式,其中PDF是Internet上进行电子文档发行和数字化传播的理想格式。文章介绍了一些日常使用PDF文档的体会,希望有助于读者更好地应用PDF文档。     

再现PDF文件的庐山真面目

笔者是保险公司的电脑管理员,在工作中经常使用到PDF文档。然而,在用PDF文件阅读器Acrobat Reader4.0打开这些随电子邮件所带的PDF文件时,经常遇到无法打开文件的情况,出现“There was an error pro-cessing a page.The en-coding(CMap)specifiedby a font is missing or cor-rupted”的错误提示,文件     

看似PDF文档 实则电脑病毒

病毒名称：虚假“PDF文档” 病毒危害 这种病毒通过电子邮件附件的形式进行传播，这种附件一般采用Zip格式的压缩文件。当用户预览这个压缩文件时，可以看到其中包含有一个“PDF文档”以及若干个“快捷方式”。当解压后却会发现这个“PDF文档”无法正常打开浏览，而当用户下意识地运行其他的“快捷方式”时，肯定不会想到实际上它们是批处理文件。     

Universal Viewer实用技巧三则

Universal Viewer(ATViewer)是一款非常好用的文件浏览工具,很多朋友都使用它来预览各种格式的文档,包括PDF文档、Office文档、图片、各种网页和编码、字体文件、Flash Video、音乐文件以及视频文件,目前发布了最新的3.2.0版本,这里介绍三则比较实用的技巧。     

将光栅图象转换成PDF文件的研究与实现

本文研究了将TIFF／IT格式的光栅图象文件转换成PDF文件的方法。该方法通过将TIFF／IT文件中的图形文字矢量化，并采用高效的数据压缩方法存储图象和矢量化的图形命令，使得生成的PDF文件不仅质量好而且数据量小。它完全可以满足印刷业双字节文字PDF文件生产的要求。     

轻松玩转DjVu电子书

近来,笔者所在的集团统一使用DjVu格式电子文档替代以前使用的PDF格式,单位接到通知后,要求将Word文档、PDF文档转换成DjVu格式。如何实现？     

支持Flash！Acrobat9中文版火速评测

提到电子文档很容易让人想到PDF格式,PDF是由Adobe公司推出的图文电子文档专用格式,很多原版电子杂志都是使用PDF文档作为“载体”的。要想浏览或编辑PDF文件,安装“Acrobat”或“Acrobat reader”必不可少。“Acrobat reader”可以浏览并打印PDF文档,而“Acrobat”则可以在浏览的同时编辑或创建新的PDF文档。日前“Acrobat”软件的最新版9.0已经正式发布,     

应用类软件——软件使用伪技巧

在日常使用中,除了系统,我们接触得最多的就是应用软件了。我们要借助各类软件完成各种操作,因此除了关于系统的伪技巧外,网上也充斥着很多关于常用软件的伪技巧。伪技巧1:文件转为PDF文档就安全了大家知道现在很多电子书籍、产品的使用文档都是使用PDF格式,我们在使用常见的PDF阅读器查看这些文档时是无法编辑的,因此很多朋友认为将自己的文档转换为PDF就很安全了。实际上PDF文档并非不可编辑,而且很多PDF阅读器就可以对PDF文档的内容进行复制。比如免费的"福昕阅读器"就可以对很多PDF文档进行编辑,启动该软件后打开PDF文档,然后单击"工具→文本选择工具"。此时使用鼠标就可以将PDF文档的内容选取,右击需要复制的内容选择"复制到     

软件类

在没有专门制作PDF工具的情况下想将Word文档转换成PDF格式,我们可以使用SnagIT达到你的要求,在Word中打开需要转换的文档,执行“文件→打印”,在“打印”对话框中选择名称为“SnagIT 8”的打印机,打印之后会自动调用nagIT打开Word文档的内容,这时在输出类型中选择“PDF-AdobePDF”即可将Word文档转换成PDF版本了。另外除了转换成PDF格式,还可以转换成jpg、Gif等图形格式也可以防止修改。     

U3D文件在PDF中的应用及其C＋＋编程实现

在探讨PDF文件格式的基础上,提出了一种通用三维(简称U3D)文件格式嵌入到PDF文件中的方法。这种方法具有可扩展性,对于如何在其他文件中支持U3D文件格式的应用研究也具有一定的参考价值。最后,还通过C++编程实现了在PDF文件中嵌入3D作品,并允许用户交互地观看显示效果。     

Substituting outline fonts for bitmap fonts in archived PDF files

As collections of archived digital documents continue to grow the maintenance of an archive, and the quality of reproduction from the archived format, become important long‐term considerations. In particular, Adobe's portable document format (PDF) is now an important ‘final form’ standard for archiving and distributing electronic versions of technical documents. It is important that all embedded images in the PDF, and any fonts used for text rendering, should at the very minimum be easily readable on screen. Unfortunately, because PDF is based on PostScript technology, it allows the embedding of bitmap fonts in Adobe Type 3 format as well as higher‐quality outline fonts in TrueType or Adobe Type 1 formats. Bitmap fonts do not generally perform well when they are scaled and rendered on low‐resolution devices such as workstation screens. The work described here investigates how a plug‐in to Adobe Acrobat enables bitmap fonts to be substituted by corresponding outline fonts using a checksum matching technique against a canonical set of bitmap fonts, as originally distributed. The target documents for our initial investigations are those PDF files produced by LATEX systems when set up in a default (bitmap font) configuration. For all bitmap fonts where recognition exceeds a certain confidence threshold replacement fonts in Adobe Type 1 (outline) format can be substituted with consequent improvements in file size, screen display quality and rendering speed. The accuracy of font recognition is discussed together with the prospects of extending these methods to bitmap‐font PDF files from sources other than LATEX. Copyright © 2003 John Wiley & Sons, Ltd.     

嵌入式系统中PDF格式的高效压缩算法

提出的算法可以解决在嵌入式系统上显示含有文本和图像的PDF文件的要求。该算法先将PDF文件分解成图像和文本两部分,然后依照原文件的显示格式将分解出来的元素合成一种新的格式文件,最终实现将PC机上的PDF格式文件转化为适合在嵌入式系统上正确显示的格式。该算法缩减了文件的大小,使之适应于嵌入式系统有限的硬件资源,也扩大了嵌入式系统的文件来源。     

SDMP: A secure detector for epidemic disease file based on DNN

In the era of intelligent office, reading and processing PDF files by mobile devices have become important parts of various businesses. However, due to the universality of mobile device and PDF file, they are also often used by attackers to disguise malicious codes, which makes users in danger. Especially in medical field, once computer virus invades medical experts’ devices, a large number of data with high medical research value will face huge damage and irreparable loss. Therefore, how to ensure the security when users make use of PDF files is a challenging and meaningful task. In this paper, we design an secure detector of malicious PDF file for epidemic disease file based on Deep Neural Network to solve the problem of privacy and security in handling epidemic disease file. Experiment shows that the detection accuracy of our detector can achieve up to 99.3%. Moreover, the time cost on raining and forecasting of the proposed DNN model is extremely low, less than 1s per epoch.     

PDF文件中可识别图像的提取

PDF（portable documentformat）文件是用于电子文档分发的理想格式,是全球电子文档分发的开放式标准.从PDF文件中提取可供识别的图像,有利于图像识别和信息处理.详细介绍了一种从PDF文件中提取可识别图像的方案.     

PDF文件中关键信息的提取与组织方法研究

在PDF的各种应用中,对于文档的理解与处理是非常重要的.首先要从文档中提取相关的关键词和短语,以便于在文档内部或外部建立超链接,方便建立电子文档.因此提出了一种新的方法,将关键信息(关键性的单词、词组或区域)从PDF文件中提取出来,经过组织后,保存在称为KIU的文件中,这样可以在实际上不接触PDF文件的情况下,自动生成超链接.分区域的方法有利于提取过程,找到文本的位置和范围后,可以借助于光学字符识别(OCR)软件来提取文本中的关键性词语或词组.     

在.NET平台上应用COM进行文档网上发布

人们经常利用办公软件制作各种文档,某些情况下需要将制作的办公文档在网上发布.为了能够批量地将办公文档发布到网页上,提出一种应用COM组件接口将文档转化为PDF格式文件,然后再将PDF文件转化为图片,把文档发布到网上的方法,使得信息的利用率大大提高,展示更容易.方法的实用性和扩展性强,具有批量处理文档的能力,能极大地提高工作效率,具有较好的应用价值.     

Filematch: a format for the interchange of computer-based files of structured data

The structure of data in computer-based files is information which may not be explicit in the files themselves, but is incorporated in part in the computer software designed to process the files. If a computer-processable file of data is to be processed using a “system” other than the one used to generate the file initially, conversion of the file to another format is normally necessary. A format, called FILEMATCH, is presented which for structures encountered in earth science data, incorporates the structural information in the files themselves, thus providing a medium for interchange of files among a variety of software systems.     

Raw data extraction from electrocardiograms with Portable Document Format

During the last two decades there has been a thorough research and development of standards and protocols in order to cope with different electrocardiogram formats from heterogeneous acquisition systems. Despite the efforts of public and private consortiums on creating a standardized electrocardiogram (ECG) storage format, there is still not a single one. Indeed, there is also the necessity of access to raw data of the ECGs previously acquired. Most of these documents have been saved as Adobe PDF files, since for medical staff it is an easy format for later visualization. However, this format presents difficulties when trying to access original raw data for subsequent studies and signal analysis. In this manner, this paper presents an application that obtains plain numerical data from ECG files stored with PDF format. Data can also be exported to one of the most common file formats in existence, to be easily accessed thereafter.