OpenCV - cartToPolar()
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笛卡尔坐标转换为极坐标。
cartToPolar(...) cartToPolar(x, y[, magnitude[, angle[, angleInDegrees]]]) -> magnitude, angle . @brief Calculates the magnitude and angle of 2D vectors. . . The function cv::cartToPolar calculates either the magnitude, angle, or both . for every 2D vector (x(I),y(I)): . f[egin{array}{l} exttt{magnitude} (I)= sqrt{ exttt{x}(I)^2+ exttt{y}(I)^2} , \ exttt{angle} (I)= exttt{atan2} ( exttt{y} (I), exttt{x} (I))[ cdot180 / pi ] end{array}f] . . The angles are calculated with accuracy about 0.3 degrees. For the point . (0,0), the angle is set to 0. . @param x array of x-coordinates; this must be a single-precision or . double-precision floating-point array. . @param y array of y-coordinates, that must have the same size and same type as x. . @param magnitude output array of magnitudes of the same size and type as x. . @param angle output array of angles that has the same size and type as . x; the angles are measured in radians (from 0 to 2*Pi) or in degrees (0 to 360 degrees). . @param angleInDegrees a flag, indicating whether the angles are measured . in radians (which is by default), or in degrees. . @sa Sobel, Scharr
cv.cartToPolar(1, 0)
(array([[1.], [0.], [0.], [0.]]), array([[0.], [0.], [0.], [0.]]))
cv.cartToPolar((1, 0, -1, 0), (0, 1, 0, -1))
(array([[1.], [1.], [1.], [1.]]), array([[0. ], [1.57079637], [3.14159274], [4.71238899]]))
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