opencv 学习总结

1. Mat  to IplImage* 的方法：

#include <opencv2/opencv.hpp>#include <iostream>#include <string>#include <vector>#include "Chroma.h"#include "cv.h"#include "highgui.h"using namespace concurrency;using namespace concurrency::fast_math;using namespace cv;using namespace std;void main(int argc, char ** argv){Mat frame_dest = imread("bule.jpg");IplImage *lplImage_dest = &IplImage(frame_dest);}

2. 取像素点的值，或者设置像素点的值

#include <opencv2/highgui/highgui.hpp>  #include <opencv2/imgproc/imgproc.hpp>  #include <opencv2/core/core.hpp> #include <opencv2/opencv.hpp>#include <iostream>#include <string>#include <vector>#include "Chroma.h"#include "cv.h"#include "highgui.h"using namespace concurrency;using namespace concurrency::fast_math;using namespace cv;using namespace std;void main(int argc, char ** argv){Mat _src_frame = imread("bule.jpg");Mat _background_frame = imread("red.jpg");Mat frame_YCbCr;IplImage *lplImage_src = &IplImage(_src_frame);IplImage *lplImage_background = &IplImage(_background_frame);for (int i = 0; i < row; i++){for (int j = 0; j < col; j++){if(i*j>50){CV_IMAGE_ELEM(lplImage_background, unsigned char, i, j * 3 + 0) = _src_frame.at<Vec3b>(i, j).val[0];CV_IMAGE_ELEM(lplImage_background, unsigned char, i, j * 3 + 1) = _src_frame.at<Vec3b>(i, j).val[1];CV_IMAGE_ELEM(lplImage_background, unsigned char, i, j * 3 + 2) = _src_frame.at<Vec3b>(i, j).val[2];}}}}

3. 图像裁剪

#include <opencv2/highgui/highgui.hpp>  #include <opencv2/imgproc/imgproc.hpp>  #include <opencv2/core/core.hpp> #include <opencv2/opencv.hpp>#include <iostream>#include <string>#include <vector>#include "Chroma.h"#include "cv.h"#include "highgui.h"using namespace concurrency;using namespace concurrency::fast_math;using namespace cv;using namespace std;void main(int argc, char ** argv){Mat frame_src = imread("bule.jpg");Rect rect(col / 2, row/2, 300, 200);Mat partImg = frame_src(rect);imwrite("part_image.jpg", partImg);}

4. 高斯滤波和颜色空间转换

#include <opencv2/highgui/highgui.hpp>  #include <opencv2/imgproc/imgproc.hpp>  #include <opencv2/core/core.hpp> #include <opencv2/opencv.hpp>#include <iostream>#include <string>#include <vector>#include "Chroma.h"#include "cv.h"#include "highgui.h"using namespace concurrency;using namespace concurrency::fast_math;using namespace cv;using namespace std;void main(int argc, char ** argv){Mat _src_frame = imread("bule.jpg");Mat frame_YCbCr;IplImage *lplImage_src = &IplImage(_src_frame);int row = _src_frame.rows;int col = _src_frame.cols;GaussianBlur(_src_frame, frame_GaussianBlur, Size(5, 5), 0, 0);cvtColor(frame_GaussianBlur, frame_YCbCr, CV_BGR2YCrCb);for (int i = 0; i < row; i++){for (int j = 0; j < col; j++){Cb_value = frame_YCbCr.at<Vec3b>(i, j).val[1];Cr_value = frame_YCbCr.at<Vec3b>(i, j).val[2];}}}

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5. 图片加水印

#include <opencv2/highgui/highgui.hpp>  #include <opencv2/imgproc/imgproc.hpp>  #include <opencv2/core/core.hpp> #include <opencv2/opencv.hpp>#include <iostream>#include <string>#include <vector>#include "Chroma.h"#include "cv.h"#include "highgui.h"using namespace concurrency;using namespace concurrency::fast_math;using namespace cv;using namespace std;void cvText(IplImage* img, const char* text, int x, int y){CvFont font;double hscale = 1.0;double vscale = 1.0;int linewidth = 2;cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX | CV_FONT_ITALIC, hscale, vscale, 0, linewidth);CvScalar textColor = cvScalar(0, 255, 255);CvPoint textPos = cvPoint(x, y);cvPutText(img, text, textPos, &font, textColor);}void main(int argc, char **argv){    Mat frame_background = imread("bule.jpg");lplImage_background = &IplImage(frame_background);CvFont font;cvInitFont(&font, CV_FONT_HERSHEY_COMPLEX, 1, 1, 0, 2, 8);cvPutText(lplImage_background, "www.Hello.com!", cvPoint(120, 50), &font, CV_RGB(0, 255, 0));imwrite("water_cover.jpg", frame_background);}