WO2014044017A1 - 一种提高纸质文件转化成的pdf文件的清晰度的方法 - Google Patents

一种提高纸质文件转化成的pdf文件的清晰度的方法 Download PDF

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WO2014044017A1
WO2014044017A1 PCT/CN2013/000844 CN2013000844W WO2014044017A1 WO 2014044017 A1 WO2014044017 A1 WO 2014044017A1 CN 2013000844 W CN2013000844 W CN 2013000844W WO 2014044017 A1 WO2014044017 A1 WO 2014044017A1
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file
margin
pdf file
pdf
data
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PCT/CN2013/000844
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林明俊
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福州福昕软件开发有限公司北京分公司
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Priority to US14/425,791 priority Critical patent/US9402014B2/en
Publication of WO2014044017A1 publication Critical patent/WO2014044017A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/23Reproducing arrangements
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/002D [Two Dimensional] image generation
    • G06T11/60Editing figures and text; Combining figures or text
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2210/00Indexing scheme for image generation or computer graphics
    • G06T2210/22Cropping

Definitions

  • the present invention relates to the technical field of improving the sharpness of PDF documents into which paper documents are converted, and more particularly to a method for improving the sharpness of PDF documents into which paper documents are converted. Background technique
  • PDF file is an electronic file that is widely used.
  • PDF is an abbreviation of Portable Document Format, which means a portable file format, which is an electronic file format, and an electronic file in PDF format is called a PDF file.
  • PDF files come from the conversion of paper documents.
  • the process is to scan the contents of the paper documents into electronic image files, and then convert the data of the electronic image files into PDF files through software methods. Since the electronic image file scanned by the paper document carries a certain amount of impurity data (that is, data from the scanning process itself that is not part of the paper file), this part of the impurity data is retained in the subsequent format conversion process. Down, it seriously affects the reader's reading. Therefore, the PDF file converted by using the prior art has poor definition and the reading quality is not good, especially when reading on a small electronic device such as a mobile phone. Damage the reader's eyes. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a method for improving the sharpness of a PDF file into which a paper document is converted, which can improve the sharpness of a PDF file into which a paper document is converted.
  • a method for improving the sharpness of a PDF file into which a paper document is converted comprising:
  • Step 1 Scan the paper file to obtain an electronic picture file
  • Step 2 determining an upper margin, a bottom margin, a left margin, and a right margin of the electronic picture file, and deleting data in a range of a top margin, a bottom margin, a left margin, and a right margin of the electronic image file, and the obtained Converting the first crop file to the first PDF file;
  • Step 3 The first PDF file is divided into a plurality of rectangular objects, the effective area of each rectangular object is determined, and the data of each rectangular object except the effective area is deleted, and a crop rectangle corresponding to each rectangular object is obtained.
  • Step 4 Combine each crop rectangle object according to the same position distribution of the corresponding rectangular object on the first PDF file to obtain a second PDF file output.
  • the invention has the following beneficial effects: The present invention performs the first cropping of the electronic image file obtained by scanning the paper document, and deletes the data within the four margin ranges, thereby filtering out the first PDF file located in the range. Invalid data and impurity data; after dividing the first PDF file into a plurality of rectangular objects, the present invention performs a second cropping on each rectangular object, retaining only the effective area of each rectangular object, and deleting the remaining invalid data.
  • the impurity data in the second PDF file finally generated by the present invention is greatly reduced, and the influence on the effective data that can be read is naturally greatly reduced, therefore,
  • the invention greatly improves the clarity of PDF files converted from paper documents, making PDF files more suitable for reading, especially for reading on small devices.
  • the present invention can also be improved as follows:
  • step 3-4-1 is further included: summing the pixels of the effective areas of all the cropped rectangular objects to obtain the reading area of the first PDF file.
  • the method further includes the step 3- 4- 2: performing fault tolerance processing on each cropped rectangular object.
  • FIG. 1 is a flow chart of a method for improving the sharpness of a PDF file converted into a paper document according to the present invention. detailed description
  • the present invention proposes a method for improving the sharpness of a PDF document into which a paper document is converted.
  • the sharpness refers to the degree of clarity of each detail and its boundary on the PDF file. The less the impurity data on the DPF file, the better the clarity.
  • FIG. 1 is a flow chart of a method for improving the sharpness of a PDF file converted into a paper document according to the present invention. As shown in Figure 1, the method includes:
  • Step 101 Scan the paper file to obtain an electronic picture file.
  • the paper document in the present invention may be any document recorded on paper such as a book or a book.
  • This step allows you to scan paper documents with a scanner.
  • Step 102 Determine the top margin, the bottom margin, the left margin, and the right margin of the electronic image file, and delete the data in the top margin, the bottom margin, the left margin, and the right margin of the electronic image file, and the first crop is obtained.
  • the top margin, the bottom margin, the left margin, and the right margin are similar to the top margin, the bottom margin, the left margin, and the right margin of a common paper document, respectively.
  • the top margin of the electronic image file refers to the electron.
  • the maximum data at the top of the image file that is, the data reflecting the content on the original paper file
  • the top of the electronic image file It is obvious that the data in the range is invalid data (ie, with the base paper).
  • the content on the quality file is irrelevant to the data), so deleting this part of the invalid data has no loss for the integrity of the data.
  • the bottom margin of the electronic picture file refers to the range between the valid data at the bottom of the electronic picture file and the bottom end of the electronic picture file
  • the left margin of the electronic picture file refers to the leftmost end of the electronic picture file.
  • the right margin of the electronic picture file refers to the range between the valid data at the far right end of the electronic picture file and the rightmost end of the electronic picture file
  • the top margin Similarly, the data located in the bottom margin, the left margin, and the right margin of the electronic image file are invalid data, and deleting the invalid data will not damage the integrity of the data.
  • the format of the first cropped file obtained by deleting invalid data in the top margin, the bottom margin, the left margin, and the right margin is the same as that of the electronic image file, and is still in the form of an image.
  • format conversion is involved. In this step, the method of converting the first crop file into the first PDF file is prior art, and is not mentioned here.
  • Step 103 Divide the first PDF file into a plurality of rectangular objects, determine valid areas of the rectangular objects, and delete data of each rectangular object except the effective area, and obtain a cropped rectangular object corresponding to each rectangular object.
  • the first PDF file is usually set to a rectangle, so it can be considered as a combination of several rectangular objects, so that it can be subdivided into several rectangular objects.
  • the rectangular object here usually consists of a plurality of pixels, which are also rectangular in appearance, and are square in a special case.
  • Each rectangular object can contain a certain amount of valid data and a certain amount of invalid data. Of course, it can also be allowed to exist when the rectangular object contains only valid data or only invalid data. It can be considered as follows: The data contained in a rectangular object is only divided into valid data and invalid data. The range covered by the valid data is called the effective area in the present invention, and the invalid data is naturally the rectangular object except the effective area. The data is gone. Thus, this step is determined based on the effective area of each rectangular object contains a further delete each rectangular object data other than the effective area, i.e.
  • an electronic image file may be deleted at step 102 the top Based on the invalid data in the range of the distance, the bottom margin, the left margin and the right margin, the proportion of the valid data in the finally generated second PDF file is further increased, thereby improving the sharpness of the second PDF file.
  • Step 104 Align each crop rectangle object with the same bit on the first PDF file as its corresponding rectangle object The distribution is combined to obtain a second PDF file output.
  • step 103 deletes the invalid data in each rectangular object, it can be considered that the generated cropped rectangle object does not contain or substantially contains no invalid data, and the data set of all the cropped rectangle objects is included in the paper file included in step 101.
  • the content is exactly the same. Therefore, in this step, each cropped rectangle object is combined into a second PDF file, and the combination method is: according to the one-to-one correspondence between the cropped rectangle object and the rectangular object in step 103, the position of each cropped rectangle object on the second PDF file The relationship is set to be the same as the positional relationship of the corresponding rectangular object on the first PDF file.
  • the second PDF file obtained in this step is a PDF file derived from the paper document in step 101 and improved in sharpness with respect to the prior art.
  • the present invention performs the first cropping of the electronic image file obtained by scanning the paper document, and deletes the data within the four margin ranges, thereby filtering out the invalid data of the first PDF file in the range and Impurity data; after dividing the first PDF file into a plurality of rectangular objects, the present invention performs a second cropping on each rectangular object, retaining only the effective area of each rectangular object, and deleting the remaining invalid data and impurity data. Therefore, compared with the PDF file generated by the prior art, the impurity data in the second PDF file finally generated by the present invention is greatly reduced, and the influence on the effective data that can be read is naturally greatly reduced, and therefore, the present invention is greatly improved.
  • the clarity of PDF files converted into paper documents makes PDF files more suitable for reading, especially for reading on small devices.
  • step 103-1 may be further included (M-1: summing the pixels of the effective area of all the cropped rectangle objects to obtain the read area of the first PDF file.
  • the effective area of all the cropped rectangle objects is covered by the valid data.
  • the read area of the first PDF file obtained by the sum of the pixels is determined, and the data amount of the second PDF file can be obtained, thereby facilitating downloading and saving.
  • step 10 3 - 2 may be further included: performing fault tolerance processing on each cropped rectangular object.
  • the fault-tolerant processing step set here can be normally received and decoded and obtain a better visual effect when part of the data of the second PDF file is wrong or lost (such as error or loss in network transmission). Improve the error correction performance of the second PDF file.
  • the present invention has the following advantages: (1) The present invention performs the first cropping of the electronic image file obtained by scanning the paper document, and deletes the data within the four margin ranges, thereby filtering out invalid data and impurities in the range of the first PDF file. Data; after dividing the first PDF file into a plurality of rectangular objects, the present invention performs a second cropping on each rectangular object, retaining only the effective area of each rectangular object, and deleting the remaining invalid data and impurity data. Therefore, compared with the PDF file generated by the prior art, the impurity data in the second PDF file finally generated by the present invention is greatly reduced, and the influence on the effective data that can be read is naturally greatly reduced. Therefore, the present invention greatly improves the present invention.
  • the sharpness of PDF files converted into paper documents makes PDF files more suitable for reading, especially for reading on small devices.
  • the fault-tolerant processing step set by the present invention can be normally received and decoded, and obtain better when part of the data of the second PDF file is wrong or lost (such as error or loss in network transmission). Visual effects, thereby improving the error correction performance of the second PDF file

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Editing Of Facsimile Originals (AREA)

Abstract

本发明涉及一种提高纸质文件转化成的PDF文件的清晰度的方法。该方法包括:步骤1:扫描纸质文件,得到电子图片文件;步骤2:确定电子图片文件的上边距、下边距、左边距和右边距,并删除处于电子图片文件的上边距、下边距、左边距及右边距范围内的数据,将得到的第一裁剪文件转换为第一PDF文件;步骤3:将第一PDF文件分为若干个矩形对象,确定各矩形对象的有效区域,并删除各矩形对象除其有效区域之外的数据,得到与各矩形对象一一对应的裁剪矩形对象;步骤4:将各裁剪矩形对象按照与其对应的矩形对象在第一PDF文件上相同的位置分布进行组合,得到第二PDF文件输出。本发明能提高纸质文件转化成的PDF文件的清晰度。

Description

一种提高紙质文件转化成的 PDF文件的清晰度的方法 技术领域
本发明涉及提高纸质文件转化成的 PDF文件的清晰度的技术领域, 特别是涉及一种 提高纸质文件转化成的 PDF文件的清晰度的方法。 背景技术
PDF文件是一种得到广泛应用的电子文件。 PDF是 Portable Document Format的缩写, 意为便携文件格式, 是一种电子文件格式, 而采用 PDF格式的电子文件称为 PDF文件。
PDF文件多来自于对纸质文件的转化, 其过程是先将纸质文件的内容扫描为电子图 片文件, 再通过软件方法将电子图片文件的数据进行格式的转换, 变成 PDF文件。 由于 纸质文件扫描成的电子图片文件会携带一定量的杂质数据 (即不属于纸质文件的内容而 来自于扫描过程本身的数据), 这部分杂质数据在随后的格式转换过程中被保留了下来, 严重影响读者的阅读, 因此, 利用现有技术转化而成的 PDF文件的清晰度较差, 阅读质 量并不好, 尤其是在屏幕较小的电子设备(如手机)上阅读时, 容易损害读者的眼睛。 发明内容
本发明所要解决的技术问题是提供一种提高纸质文件转化成的 PDF文件的清晰度的 方法, 能提高纸质文件转化成的 PDF文件的清晰度。
本发明解决上述技术问题的技术方案如下: 一种提高纸质文件转化成的 PDF文件的 清晰度的方法, 该方法包括:
步骤 1: 扫描所述纸质文件, 得到电子图片文件;
步骤 2: 确定所述电子图片文件的上边距、 下边距、 左边距和右边距, 并删除处于所 述电子图片文件的上边距、 下边距、 左边距及右边距范围内的数据, 将得到的第一裁剪 文件转换为第一 PDF文件;
步驟 3: 将所述第一 PDF文件分为若干个矩形对象, 确定各矩形对象的有效区域, 并删除各矩形对象除其有效区域之外的数据, 得到与各矩形对象一一对应的裁剪矩形对 象;
步骤 4: 将各裁剪矩形对象按照与其对应的矩形对象在所述第一 PDF文件上相同的 位置分布进行组合, 得到第二 PDF文件输出。 本发明的有益效果是: 本发明对扫描紙质文件得到的电子图片文件进行了第一次裁 剪, 删除了其四个边距范围内的数据, 从而滤除了第一 PDF文件位于该范围内的无效数 据以及杂质数据; 在将第一 PDF文件分为若干矩形对象之后, 本发明又对各矩形对象进 行了第二次裁剪, 仅保留了各矩形对象的有效区域, 而删除了其余的无效数据和杂质数 据, 因此, 相对于现有技术生成的 PDF文件, 本发明最终生成的第二 PDF文件中的杂质 数据大大减少, 其对可供阅读的有效数据的影响自然也大大减少, 因此, 本发明大大提 高了纸质文件转化成的 PDF文件的清晰度,使 PDF文件更加适合阅读, 尤其是更适合安 装在小型设备上阅读。
在上述技术方案的基础上, 本发明还可以做如下改进:
进一步, 在所述步骤 3之后, 在所述步骤 4之前, 还包括步骤 3- 4-1 : 合计所有裁剪 矩形对象的有效区域的像素之和, 得到所述第一 PDF文件的阅读区域。
进一步, 在所述步骤 3-4- 1之后, 在所述步骤 4之前, 还包括步骤 3- 4- 2 : 对各裁剪 矩形对象进行容错处理。 附图说明
图 1为本发明提出的提高纸质文件转化成的 PDF文件的清晰度的方法的流程图。 具体实施方式
以下结合附图对本发明的原理和特征进行描述, 所举实例只用于解释本发明, 并非 用于限定本发明的范围。
本发明提出了一种提高纸质文件转化成的 PDF文件的清晰度的方法, 清晰度指的是 PDF文件上各细部影纹及其边界的清晰程度。 DPF文件上的杂质数据越少, 其清晰度就 越好。
图 1为本发明提出的提高纸质文件转化成的 PDF文件的清晰度的方法的流程图。 如 图 1所示, 该方法包括:
步骤 101 : 扫描纸质文件, 得到电子图片文件。
本发明中的纸质文件可以为书籍、 画册等任一记载在纸张上的文件。
本步骤可以采用扫描仪对纸质文件进行扫描。
步骤 102: 确定电子图片文件的上边距、 下边距、 左边距和右边距, 并删除处于电子 图片文件的上边距、 下边距、 左边距及右边距范围内的.数据, 将得到的第一裁剪文件转 换为第一 PDF文件。
本步骤中, 上边距、 下边距、 左边距和右边距与常见的纸质文件的上边距、 下边距、 左边距和右边距的含义分别类似, 电子图片文件的上边距指的是位于该电子图片文件最 顶端的有效数据 (即能反映原纸质文件上的内容的数据) 与该电子图片文件最顶端之间 的范围,很明显,该范围内的数据都是无效数据(即与原纸质文件上的内容无关的数据 ) , 因而删除这部分无效数据对于数据的完整性而言毫无损失。 同样, 电子图片文件的下边 距指的是位于该电子图片文件最底端的有效数据与该电子图片文件最底端之间的范围, 电子图片文件的左边距指的是位于该电子图片文件最左端的有效数据与该电子图片文件 最左端之间的范围, 电子图片文件的右边距指的是位于该电子图片文件最右端的有效数 据与该电子图片文件最右端之间的范围, 与上边距的描述类似, 位于电子图片文件下边 距、 左边距和右边距范围内的数据都是无效数据, 删除这些无效数据也不会损害数据的 完整性。
删除上边距、 下边距、 左边距和右边距范围内的无效数据所得到的第一裁剪文件的 格式与电子图片文件的格式相同, 本质上仍为图片格式, 要生成 PDF文件就要涉及格式 转换, 本步骤中, 将第一裁剪文件转换为第一 PDF文件的方法为现有技术, 在此不做赞 述。
步骤 103: 将第一 PDF文件分为若干个矩形对象, 确定各矩形对象的有效区域, 并 删除各矩形对象除其有效区域之外的数据,得到与各矩形对象一一对应的裁剪矩形对象。
从外观上来看, 第一 PDF文件通常设置为矩形, 因而可以将其看作由若干个矩形对 象组合而成, 这样, 就可以对其进行细微的分割, 将其分为若干个矩形对象。 这里的矩 形对象通常由多个像素组成, 从外观来看也是矩形, 较特殊的情况为正方形。
每个矩形对象都可以包含一定量的有效数据和一定量的无效数据, 当然, 也可以容 许矩形对象只包含有效数据或者只包含无效数据的情况存在。 可以这样认为: 一个矩形 对象所包含的数据仅分为有效数据和无效数据两种, 有效数据所覆盖的范围在本发明中 称为有效区域, 无效数据自然就是该矩形对象除其有效区域之外的数据了。 因此, 该步 骤在确定了各矩形对象所包含的有效区域的基础上, 进一步删除各矩形对象除其有效区 域之外的数据, 也就是删除了无效数据, 可以在步骤 102删除电子图片文件上边距、 下 边距、 左边距和右边距范围内无效数据的基础上, 进一步提高有效数据在最终生成的第 二 PDF文件中所占的比例, 从而提高第二 PDF文件的清晰度。
步骤 104: 将各裁剪矩形对象按照与其对应的矩形对象在第一 PDF文件上相同的位 置分布进行组合, 得到第二 PDF文件输出。
由于步骤 103删除了各矩形对象中的无效数据, 因而可以认为生成的裁剪矩形对象 中不含或基本不含无效数据, 所有裁剪矩形对象的数据集合是与步骤 101 中的纸质文件 所包含的内容完全相同的。 因此, 本步骤将各裁剪矩形对象组合为第二 PDF文件, 组合 方法为: 根据裁剪矩形对象与步骤 103 中的矩形对象的一一对应性, 将各裁剪矩形对象 在第二 PDF文件上的位置关系设置为与其对应的矩形对象在第一 PDF文件上的位置关系 相同, 当然, 对于矩形对象完全由无效数据组成的特殊情况, 由于步骤 103所生成的与 其对应的裁剪矩形对象不包含任何数据, 相当于被完全删除, 因此, 可以在第二 PDF文 件上该裁剪矩形对象所处的位置不设置任何数据。
本步骤所得到的第二 PDF文件就是来源于步骤 101中的纸质文件且相对于现有技术 提高了清晰度的 PDF文件。
由此可见, 本发明对扫描纸质文件得到的电子图片文件进行了第一次裁剪, 删除了 其四个边距范围内的数据, 从而滤除了第一 PDF文件位于该范围内的无效数据以及杂质 数据; 在将第一 PDF文件分为若干矩形对象之后, 本发明又对各矩形对象进行了第二次 裁剪, 仅保留了各矩形对象的有效区域, 而删除了其余的无效数据和杂质数据, 因此, 相对于现有技术生成的 PDF文件,本发明最终生成的第二 PDF文件中的杂质数据大大减 少, 其对可供阅读的有效数据的影响自然也大大减少, 因此, 本发明大大提高了纸质文 件转化成的 PDF文件的清晰度,使 PDF文件更加适合阅读, 尤其是更适合安装在小型设 备上阅读。
进一步, 在步骤 103之后, 在步骤 104之前, 还可以包括步骤 103- 1 (M-1 : 合计所有 裁剪矩形对象的有效区域的像素之和, 得到第一 PDF文件的阅读区域。
这里, 所有裁剪矩形对象的有效区域由有效数据覆盖而成, 本步骤确定其像素之和 所得到的第一 PDF文件的阅读区域, 可以获得第二 PDF文件的数据量,从而方便下载和 保存。
进一步, 在步驟 103- 104- 1之后, 在步骤 1 (M之前, 还可以包括步骤 103- 2: 对 各裁剪矩形对象进行容错处理。
这里设置的容错处理步骤, 可以在第二 PDF文件的部分数据发生了错误或丢失(如 在网络传输中出错或丟失)时,还能被正常接收和解码,并获得较好的视觉效果,从而提高 第二 PDF文件的纠错性能。
由此可见, 本发明具有以下优点: ( 1 )本发明对扫描纸质文件得到的电子图片文件进行了第一次裁剪, 删除了其四个 边距范围内的数据, 从而滤除了第一 PDF文件位于该范围内的无效数据以及杂质数据; 在将第一 PDF文件分为若干矩形对象之后, 本发明又对各矩形对象进行了第二次裁剪, 仅保留了各矩形对象的有效区域, 而删除了其余的无效数据和杂质数据, 因此, 相对于 现有技术生成的 PDF文件, 本发明最终生成的第二 PDF文件中的杂质数据大大减少, 其 对可供阅读的有效数据的影响自然也大大减少, 因此, 本发明大大提高了纸质文件转化 成的 PDF文件的清晰度,使 PDF文件更加适合阅读, 尤其是更适合安装在小型设备上阅 读。
( 2 )本发明设置的容错处理步骤, 可以在第二 PDF 文件的部分数据发生了错误或 丢失(如在网络传输中出错或丢失)时,还能被正常接收和解码,并获得较好的视觉效果, 从而提高第二 PDF文件的纠错性能
以上所述仅为本发明的较佳实施例, 并不用以限制本发明, 凡在本发明的精神和原 则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权 利 要 求
1. 一种提高纸质文件转化成的 PDF文件的清晰度的方法, 其特征在于, 该方法包 括:
步骤 1 : 扫描所述纸质文件, 得到电子图片文件;
步骤 2: 确定所述电子图片文件的上边距、 下边距、 左边距和右边距, 并删除处于所 述电子图片文件的上边距、 下边距、 左边距及右边距范围内的数据, 将得到的第一裁剪 文件转换为第一 PDF文件;
步骤 3: 将所述第一 PDF文件分为若干个矩形对象, 确定各矩形对象的有效区域, 并删除各矩形对象除其有效区域之外的数据, 得到与各矩形对象一一对应的裁剪矩形对 象;
步骤 4 : 将各裁剪矩形对象按照与其对应的矩形对象在所述第一 PDF文件上相同的 位置分布进行组合, 得到第二 PDF文件输出。
2. 根据权利要求 1所述的方法, 其特征在于, 在所述步骤 3之后, 在所述步骤 4 之前, 还包括步骤 3- 4-1 : 合计所有裁剪矩形对象的有效区域的像素之和, 得到所述第一
PDF文件的阅读区域。
3. 根据权利要求 2所述的方法, 其特征在于, 在所述步骤 3-4-1之后, 在所述步 骤 4之前, 还包括步骤 3-4- 2: 对各裁剪矩形对象进行容错处理。
PCT/CN2013/000844 2012-09-24 2013-07-12 一种提高纸质文件转化成的pdf文件的清晰度的方法 WO2014044017A1 (zh)

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