I have a format which is readable, which I can use to look up an item in the Index and then use the eBookDroid viewer to go to that page. The eBookDroid app allows you to set a page offset -8 in my case to map the index page numbers to the DJVU image file page numbers.
But I'd like to do more. I'd like to create using OCR a searchable text layer for the whole book, and also create links from the Index to the relevant page s in the book for each index term, and embed these back into the DJVU file. That took quite a few more hours! Now what I'd like to do is to OCR the rest of the text - Prefatory pages, Chapter text, bibliography and glossary pages - and create a searchable text layer within a new DJVU file, to include at least both the Chapter text and the corrected Index.
Aside from OmniPage 15 for Windows - if that can help further - I'd like to use free software as far as possible. I've installed djvusmooth on Linux Mint, because I read that it can manage the creation of OCR, but I can't see how to do that in the program. What workflow should I use? I'm moderately technically competent in using the command line in Linux or Mac and to a lesser extent in Windows batch files, but not PowerShell. I would like advice, please, on workflow and suitable free software for each stage of the process I should follow.
Many thanks in advance. Only for reading as a novel not searching. And not using DJVU. Usually some pages out of Omnipage do not flow into the next and some hyphens need to be removed.
For reading I have a Kobo reader. Such tools make it very easy to integrate full-text search for DjVu files into any document management system or searching and indexing engine. Large collections have been put on the Web in DjVu format with full-text search capabilities, including the 12 volumes and 10, pages of the Century Dictionary www.
DjVu is currently used by thousands of users to publish and exchange scanned documents on the Web. From the beginning, one of the goals in creating DjVu was to deliver a technology platform that would make it as easy to browse scanned documents as it is to browse HTML. DjVu technology enables a number of capabilities that combine to provide an optimal viewing and browsing experience, largely by virtue of the fact that it is not necessary to fully decode a DjVu file into TIFF or an equivalent raster format before you can view or print it.
Digital to DjVu refers to a component of DjVu technology designed for the encoding of digital documents e. One way to encode an electronic document is to render it as a bitmap and then convert the bitmap into DjVu format. This is a valid approach but it requires segmenting the bitmap, which can generate artifacts. Instead of rendering the document into a bitmap, Digital to DjVu considers page elements words, pictures, graphics, lines, etc.
For each such element, after occlusions are processed, the algorithm considers its shape and color content and decides whether to place it in the foreground layer or in the background layer. This in effect replaces the segmentation process used for scanned documents. Compression then proceeds normally.
Documents created using Digital to DjVu offer maximum portability across networks, since they do not depend on any installed font packages. How DjVu differs from other technologies File size and image quality are the perennially opposing forces in digital documents.
Limitations of Common Compression Technologies Documents are composed of many different elements including text, images, printed textures and background colors. Was this reply helpful? Yes No. Sorry this didn't help. Thanks for your feedback. I am a software developer and use that website regularly, That website contains applications written by developers and the code for those applications is also supplied on that website.
Whenever I have in mind to post here I always seem to find that despite lengthy searching, immediately after doing so I find am told the answer was out there all along and I just somehow missed it. I'm impressed with DjVu's ability to produce small files from tiffs with good visual appeal, the thing that's contained my enthusiasm is the knotty problem of how to create the searchable text layer ocr element to an acceptable standard or at all.
For old books I discarded the idea a few years ago that ocr text only was impractical for faithful reproduction of the original, absent many dedicated hours of professional proofing work. Anyway, the main point of this post is to report one solution which may be unknown to and of interest to others with the same objective: how to create a DjVu multi-image file with accurate ocr searchable text layer?
Answer: DjVuToy v2. Norman himself has never considered it necessary to give any information about the reasons responsible for his decision to favour the restoration of sterling to its old parity in Questioned about it by the Macmillan Committee only five or six years after the decision, he surpassed himself in evasiveness by answering that he could not remember the sequence of events. If he was unwilling to explain in , it is most unlikely that he would ever do so after the collapse of sterling, since any explanation might be taken for an attempt to vindicate himself, which is the last thing he would ever think of doing.
Rather than volunteer the briefest of explanations in defence of his policy, he would go down to history as the cause of all our troubles. For this reason alone, it is the duty of his critics to be as fair to him as is humanly possible.
In that case the ocr log stated for about 15 of pages 'OCR failed'. All but two of these were fully blank pages, but two had half pages of text. This problem has not recurred in my three tests with version 2.
B ocr by tesseract: What else is there? Well of course dtic's tiffdjvuocr which I found runs very nicely in creating DjVu and doing ocr operations on them except that in my testing I found that it like minidjvu.
Also and here is the other main point of this post there seems to be some interaction between tesseract and DjVu image files that results in garbage ocr text layer creation.
Norman himself has never considered it necessary to give any information about the reasons responsible for his decision to favour the restora- tion of sterling to its old parity in Questioned about it by the Macmillan Committee only veor si xye arsaf terth ede cision,he su rpassedhi mselfin ev asivenessby an sweringth athe co uldno tre memberth ese quenceof ev ents.
If he wa sun willingto ex plainin 19 30,it is mo stun likelyth athe wo uldev erdo so af terth eco llapseof st erling,si ncean yex planationmi ghtbe ta kenfo ran at temptto vi ndicatehi mself,wh ichis th ela stth inghe wo uldev erth inkof do ing.
0コメント