OpenCV : LogPolar transformations | Unwrap fish-eye image to Panorama

       In this post I am demonstrating how LogPolar transform can used to unwrap 360 degree image to panoramic image.

    The LogPolar function have the arguments

 src – Source image
 dst – Destination image.
 center – The transformation center;
 M – Magnitude scale parameter.
 flags – INTER_CUBIC, WARP_FILL_OUTLIERS, WARP_INVERSE_MAP etc..

C++ Code

     Mat src = imread("pan9.jpg", 1);
     Mat logPolarMat;
     logPolar(src,logPolarMat,Point(src.cols/2, src.rows/2),src.cols/8,INTER_CUBIC);

     //rotate 90 degree
     transpose(logPolarMat, logPolarMat);
     flip(logPolarMat, logPolarMat,0);

    imshow("logPolar", logPolarMat);
    imshow("src", src);
    waitKey();

Result

Source

logPolar Transform

Source

logPolar Transform

Here is another post related to unwrap fisheye image Unwrap 360 degree image using OpenCV | Converting fisheye image into panorama image