78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
#ifndef __OPENCV_FEATURES_2D_KAZE_UTILS_H__
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#define __OPENCV_FEATURES_2D_KAZE_UTILS_H__
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/* ************************************************************************* */
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/**
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* @brief This function computes the angle from the vector given by (X Y). From 0 to 2*Pi
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*/
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inline float getAngle(float x, float y) {
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if (x >= 0 && y >= 0) {
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return atanf(y / x);
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}
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if (x < 0 && y >= 0) {
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return static_cast<float>(CV_PI)-atanf(-y / x);
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}
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if (x < 0 && y < 0) {
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return static_cast<float>(CV_PI)+atanf(y / x);
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}
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if (x >= 0 && y < 0) {
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return static_cast<float>(2.0 * CV_PI) - atanf(-y / x);
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}
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return 0;
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}
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/* ************************************************************************* */
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/**
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* @brief This function computes the value of a 2D Gaussian function
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* @param x X Position
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* @param y Y Position
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* @param sig Standard Deviation
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*/
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inline float gaussian(float x, float y, float sigma) {
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return expf(-(x*x + y*y) / (2.0f*sigma*sigma));
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}
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/* ************************************************************************* */
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/**
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* @brief This function checks descriptor limits
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* @param x X Position
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* @param y Y Position
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* @param width Image width
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* @param height Image height
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*/
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inline void checkDescriptorLimits(int &x, int &y, int width, int height) {
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if (x < 0) {
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x = 0;
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}
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if (y < 0) {
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y = 0;
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}
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if (x > width - 1) {
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x = width - 1;
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}
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if (y > height - 1) {
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y = height - 1;
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}
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}
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/* ************************************************************************* */
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/**
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* @brief This funtion rounds float to nearest integer
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* @param flt Input float
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* @return dst Nearest integer
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*/
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inline int fRound(float flt) {
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return (int)(flt + 0.5f);
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}
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#endif
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