How to recognize text in a PDF file

How to identify the text of a PDF file because PDF files in this format are generally only suitable for browsing content, so you want to edit the text content directly on top of the Word document, and you need some software tools to modify the content.　　The fast OCR word recognition software has a deep research on the text recognition of PDF files. If you have this need, you can go to our official website to download the speed OCR word recognition software, you can easily help you solve the PDF document text recognition work. How OCR word recognition software works image input the subject matter to be processed by OCR must be transferred to the computer through an optical instrument, such as an image scanner, fax machine or any photographic equipment. Advances in technology, scanners and other input devices have been made more and more sophisticated, light and short, high quality, the OCR has a considerable help, the scanner's resolution to make the image clearer, sweep speed to improve the efficiency of OCR processing. Speed JPG converted to Word converter http://soft.hao123.com/soft/appid/42068.html image pre-processing: Image pre-processing is an OCR system that has to solve the problem of a module, from a two-valued image that is not black or white, or gray-scale, color image, to separate out the text image of the process, all belong to the image pretreatment. The image processing including image regularization, noise removal, image rectification, and document analysis, text-line and word-separated file pretreatment are included. Speed scan images converted to Word http://soft.hao123.com/soft/appid/42083.html text feature extraction: Single to the recognition rate, feature extraction can be said to be the core of OCR, with what characteristics, how to extract, directly affect the recognition of good or bad, Therefore, in the early stage of OCR research, feature extraction research reports are particularly numerous. And features can be said to identify the chips, simple distinction can be divided into two categories: a statistical characteristics, such as the text area of the black/white point ratio, when the text area is divided into several areas, the area of the black/white points than the Union, the space is a numerical vector, in comparison, the basic mathematical theory is sufficient to deal with. And another kind of characteristic is the structure characteristic, such as the text image fine-line, obtains the word stroke end, the intersection point number and the position, or takes the stroke segment as the characteristic, with the special comparison method, carries on the comparison, on the market the online handwriting input software recognition method mostly by this kind of structure method mainly. Agile PDF to TXT converter http://soft.hao123.com/soft/appid/42082.html comparison database: When the input text is finished with the features, either by statistical or structural characteristics, there must be a comparison of the database or feature database, The contents of the database should contain all of the character set text to be recognized, based on the feature groups that are derived from the same feature extraction method as the input text.Post-word processing: Because the recognition rate of OCR can not reach 100%, or to strengthen the correctness of the comparison and confidence value, some debugging or even help to correct the function, also become a necessary module in the OCR system. After the word processing is an example, using the comparison of the recognition text and its possible similar candidate groups, according to the identification of the front and back to find the most logical words, to do the correct function. Word database: A word store created for word post processing.

How to recognize text in a PDF file