Mutual conversion between Cartesian (x, y) spaces and data polar coordinates (log R, angle PHI)

Principle:

Polar Coordinate is a constant representation of the object's field of view. For example, all squares are the same, resulting in a class of two-dimensional rotation and scale immutability.

ROV = m * log (SQRT (X2 + y2 ))

Phi = atan (y/X)

Core functions:

Cvlogpolar

Effect:

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Code:

# Include "CV. H "# include" cxcore. H "# include" highgui. H "# include <iostream> int logpolar (INT argc, char ** argv) // polar: two levels, polar {iplimage * src = cvloadimage (" E: \ picture \ zenfanxin. jpg "); iplimage * DST = cvcreateimage (cvgetsize (SRC), Src-> depth, Src-> nchannels); iplimage * src2 = cvcreateimage (cvgetsize (SRC ), src-> depth, Src-> nchannels); double M = 80; // it seems that the larger the range of m, the clearer the restored image cvlogpolar (SRC, DST, cvpoint2d32f (SRC-> width/2, Src-> height/4), M, cv_inter_linear | cv_warp_fill_outliers); // cv_inter_linear: bilinear interpolation. outliers: out-of-office by default, cartesian coordinate conversion for multiple polar coordinates cvlogpolar (DST, src2, cvpoint2d32f (SRC-> width/2, Src-> height/4), M, cv_inter_linear | cv_warp_inverse_map ); // The number-pole coordinate transformation is the Cartesian coordinate cvnamedwindow ("src"); cvnamedwindow ("DST"); cvnamedwindow ("src2"); cvshowimage ("src", Src ); cvshowimage ("DST", DST); cvshowimage ("src2", src2); cvwaitkey (0); cvdestroywindow ("src"); cvdestroywindow ("DST "); cvdestroywindow ("src2"); cvreleaseimage (& SRC); cvreleaseimage (& DST); cvreleaseimage (& src2); Return 0 ;}

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