Rotating an image in C/C++

Question

I need code for rotating an image in C++ which functions like imrotate function of matlab. Please suggest a good link. Or if someone can provide the code for imrotate.

Or at least please explain the algorithm.

Its not a homework. I need this code for my project. And we can use any external library or code.

Answer 1

Check this hope it helps .

Other questions on stack overflow on the same topic experts opinion on it.

Answer 2

Magick can help you. Read this PDF and search for rotate.

Answer 3

There is no built-in way of accomplishing this in C++, short of writing your own function for manipulating binary data, which yields other problems like "How do I decompress a jpg/png in C++?"

Your best bet is a 3rd party graphics library such as libSDL

Answer 4

OpenCV2.0 has several computer vision and image processing tools. Specifically warpAffine (by defining the rotation matrix) will solve your problem with rotating an image.

The 2x3 transformation matrix mentioned in the documentation is as follows:

where θ is the angle of rotation and t_x and t_y is the translation along the x and y axes respectively.

You can get the source code here.

Also, OpenCV2.0 has many MATLAB-esque functions like imread, etc.

Answer 5

libgd has image rotation functions.