PDF file format is a double PDF format having a multilayer structure, the file is a PDF file derived, characterized by: a file may be a text-based (such as generated by a word document), the image may be type, either 100% keep the original layout effects, and easy indexing database, scientific management.
Online PDF double production
many times we find, obviously PDF file is scanned version, but you can copy the text in which the (occasional typo), which is how it happened? So this is a technique of making PDF, called "double PDF."
PDF file format is a double PDF format having a multilayer structure, the file is a PDF file derived, may be a text file type (for example, files generated by the word), may be an image type (such as file generated by the scan, comprising an image layer), and its position is vertically correspondence. Production process, the input data quickly through the scanner, after decontamination, OCR recognition and correction, the original image is the upper layer, the lower is the recognition result, the PDF file can then be generated directly retrieved. Both to 100% keep the original layout effects, and easy indexing database, scientific management.
PDF file format is a double PDF format having a multilayer structure, the file is a PDF file derived, characterized by: a file may be a text-based (such as generated by the Word document) may be an image type, either 100% keep the original layout effects, and easy indexing database, scientific management.
Many times we find that, obviously PDF file is scanned version, but you can copy the text of which, this is how it happened? So this is a technique of making PDF, called "double PDF."
So, how to make double PDF document it?
The following example is Foxit Advanced PDF Editor, Standard Edition or Enterprise Edition can be oh.
① You need to have a scanned copy, PDF, or image-based PDF documents:
② need to have a PDF OCR text recognition function editing software such as Foxit Advanced PDF Editor.
As follows, click on the convert --OCR-- the current file.
Note: Select the OCR engine to select "Image files can be retrieved."
Character recognition by OCR, the original image is the upper layer, the lower is the recognition result, the PDF file can then be generated directly retrieved. Both to retain the original layout 100% effect.
Without software, and you had better choose PDFJIA PDF home services, notes can be good demand.
Reproduced in: https: //blog.51cto.com/14224054/2402797