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I am looking for an open source C/C++ image/video thumbnail generation libraries.
(other than ffmpeg or DevIL)
Will Image Magick work? It is quite a capable library with C++ (and C) bindings. It does support grabbing still frames from some video formats, see here. It's a command-line example, but should work from the API as well.
Try ffmpegthumbnailer:
This thumbnailer was designed to be as fast and lightweight as possible. The only dependencies are ffmpeg, libpng and libjpeg.
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I have searched for PDF reader library that is licenced under LGPL or the like but could not find. I found only GPLs. Now I need a help to write my own library to read the PDF file and display it in my app. I have downloaded PDF Specs 1.7 from Adobe and I'm trying to search out a beginner tutorial but I'm yet to find one.
Is there a beginner tutorial for writing my own reader library (only reader)?
Thanks
Since you can't find a PDF read tutorial, why not try learning from a writer. If you want to integrate with wxWidgets, you may want to analyze the source of wxPdfDocument at http://wxcode.sourceforge.net/components/wxpdfdoc/
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I need a library for mostly color manipulation, I want to make a image become black and white, and augment the contrast, so that Tesseract (Google OCR library) can read better the images that I throw at it.
Or if someone has a better idea on how to improve Tesseract results, I am all for it.
Try OpenCV
http://sourceforge.net/projects/opencv/
Or imagemagick
http://www.imagemagick.org/script/magick++.php
or CImg, probably the easiest to use: no install it's just a header file.
If you do not want to use a big library you can code the algorithm yourself:
https://web.archive.org/web/20140825114946/http://bobpowell.net/image_contrast.aspx
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I need to develop a video generator that takes in a set of images, music files and outputs mp4 videos. The platform is linux. Was wondering if there are any existing libraries that can do this job ?
Thanks
I believe Processing can do what you want.
you can use ImageMagick for video part. It has both good graphics/video library and corresponding console application. For sound embedding use gstreamer.
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I have a simulation in C++ which generates huge amount of data. Right now I am using MATLAB libraries to save the results as a .mat file, but eventually I will be needing an open source binary format. I don't want to implement my own binary format and ASCII is not an option. I heard that VTK provides .vtk binary file format for saving 3d data structures, which is exactly what I need. Is there a good C/C++ library for reading/writing VTK files?
Yes, there is a good library providing .vtk files I/O, and it is called... wait for it... VTK! :)
http://www.vtk.org/doc/release/4.2/html/classvtkUnstructuredGridWriter.html
http://www.vtk.org/doc/release/4.2/html/classvtkUnstructuredGridReader.html
(There are many other readers/writers to suit your data type).
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Can you recommend an open source library (C or C++) to convert MS Office files into a set of images?
I am evaluating ImageMagick and while it does support PDF files, it does not work with MS Office files.
This library is quite popular and used by abiword (gnome) and kword (kde): wvWare
Hm I've seen that OpenOffice does a good job on "translating" Word to whatever, so how about installing OpenOffice and maybe using it's UNO model from C++ to solve that problem?