Cube2Cyl is a panoramic lib, for cubic to cylindrical projection conversion.
Cube2Cyl is a single header file library, available in both C and C++.
A picture is worth a thousand words.
The input:
| |
The output:
The origin (0, 0) position of the panorama will match the cubic images.
The diagonal point is (width-1, height-1).
Read more details of implementation here: http://www.wenyanan.com/cube2cyl/
Please check /demo/main.c for C version usage.
// Create an instance of Cube2Cyl algorithm
Cube2Cyl algo;
/*
Initialise the algorithm:
the width of each input is 640 pixel,
the vertical view portion is PI (180 degrees),
the horizontal view portion is 2*PI (360 degress).
In this case, the output image size will be calculated accordingly.
There is another more detailed init function you can play with.
*/
algo.init(640, M_PI, 2.0*M_PI);
// Generate the mapping from panorama to cubic
algo.genMap();
// Access the dimension of the paranoma image
unsigned int panoWidth = algo.pxPanoSizeH;
unsigned int panoHeight = algo.pxPanoSizeV;
// The next step is to map the pixels from the paranoma back to the source images
for (i = 0; i < panoWidth; ++i)
{
for (j = 0; j < panoHeight; ++j)
{
// Get the corresponding position of (i, j)
coord = algo.getCoord(i, j);
// Which side of the cube
coord->face;
// The x coordinate of the cube
coord->x;
// The y coordinate of the cube
coord->y;
}
}
This library takes any valid parameter and deals the ratio changes automatically. You can use super sampling to generate accurate panorama and deal with anti-aliasing.
A demo application is included as an usage example.
To use the demo, first compile it. Then put the test images along with the executable file and run.
The output file will be named as "PANO.bmp".
There are two sets of test images, you are free to use these images for testing purposes.
MIT license meaning that you can use it freely for private or commercial purposes.