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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 want to draw lines and text to an image file in c++. I've already considered using the ppm image format, but there I would have to create functions for getting the pixels of a line etc.
I do NOT want any huge game library with ticks or drawing something in windows on the screen.
Is there anything that I could use for that?
thanks
You can give CImg a try https://cimg.eu/
It is a header-only library and it can do what you're asking for (plus more, you can also use X11 for plotting if you provide the link dependencies for example)
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For a dataset of N records and M columns (features), I want to visualize it in 2d or 3d. Does anyone know if such a c++ library exists?
Thanks to #MatthewLueder's comment pointing out the PCA, I found libpca.
I assume you want online plotting. That is, animation plot at runtime, correct?
If so, then there are few libraries and one of which is gnuplot-iostream http://www.stahlke.org/dan/gnuplot-iostream/. I use it and recommend it. It requires the Boost library however.
Otherwise, you can write your data on files and use in a subsequent step a visualizer of your choice. Again, gnuplot is very powerful.
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I want to draw (dashed) line segments in order to visualize the output of some algorithm. How can I do this?
I know that this question is a bit vague, but I'm open to any kind of visualization method which is easy to use.
I would go for writing an SVG file - it is just text - example here and then use ImageMagick to convert that to a PNG or GIF file with
convert dottedline.svg image.gif
ImageMagick is installed on most Linux distros and is available for free for OSX and Windows.
You could also use Magick++, the C++ library of ImageMagick, or gnuplot - see my answer here.
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I'm working on vc++ with ImageMagicK.
I'd like to apply scale and grey and something like another manipulation also too, not cli.
But, I can't find any regarding scale or grey or something like any description of manipulation ..in Magick++_tutorial.pdf.
I need any description of manipulation API functions not only above things but also another also too.
How can I find these descriptions?
You are looking for
image.quantizeColorSpace( GRAYColorspace );
and
image.resize("800x600");
See here for more details.
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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.