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Using tesseract-ocr we can extract text from images. I have tested gocr which didn't work well as compare to tesseract-ocr. Installation: sudo apt-get install tesseract-ocr. Python program to convert all the image files with png extension inside of current directory to txt file. #!/usr/bin/env python3.10.
I am looking for software that recognizes text within images. I tried out all of the tools mentioned here (gocr, fuzzyocr, libhocr0, ocrad, ocrfeeder, ocropus, tesseract-ocr, cuneiform). My input was a photograph of a printed document, hence not hand writing, just printed letters. Of all the tools, tesseract-ocr is the most accurate in my tests ...
steghide imposes a file structure on the low-order bits of the pixels of an image. Consider an image as a long, sequential bit string. "cropping" an image deletes large block of pixels at several places within the file structure. That's not recoverable. "He's dead, Jim". You'll have to extract your hidden file, crop, and re- steghide the file ...
Just done this using gnome-screenshot - I then had to edit the files to decrease the colour depth from 16m to 2 (it was black text on white background, but with today's fancy font smoothing and so-on, it wasn't really black) I then had to scale the image up to 200% of the original before I got an accurate OCR from tesseract - but it worked really well once I'd done that.
Use pdfimages. pdfimages is a PDF image extractor tool which saves the images in a PDF file to PPM, PBM, JPEG or JPEG 2000 file (s) format. It's a part of the poppler-utils package, which you'll need to install. Usage: pdfimages [options] <PDF-file> <image-root>. option -all will extract images in original format.
The easiest way I found to extract .img files on Ubuntu is using PEAZIP FREE ARCHIVER, through its windows (ish) GUI. First you have to install a bunch of i386 dependencies and so you'll have to enable i386 packages too: sudo dpkg --add-architecture i386. sudo apt update.
2) Select the "select by color" tool (shift-o). 3) You may want to adjust the tool options, especially the thresold. If you can't see the tool options, you can add it from the dockable dialogs submenu of the window menu. 4) Click the background. 5) Clear it (press delete on the keyboard, or select clear from the edit menu).
Navigate to the folder where you want to save the cropped pdf, type a name, click the button Format, on the "Select image format type" window select PDF and click the button Select. Back on the "Browse and select a file" window, click the button Save. Before saving, imagemagick will ask to "select page geometry".
What you could do is: open your DOCX document with LibreOffice and save/export DOCX as ODT. rename ODT to ZIP. open ZIP with your archive manager. find all embedded images in the Pictures sub-folder. Step 2 may not be necessary as the archive manager may simply be able to open ODT as is. Recent DOCX formats are also internally ZIP files, so the ...
9. MuPDF can convert from epub to html and txt. To install it: sudo apt install mupdf mupdf-tools. To use it: mutool convert -o somefilename.txt somefilename.epub. It assumes txt output from the -o option. See mutool convert documentation for more information. Share.