常用的OpenCV操作

1、庫（linux+qt）：

libs+=/usr/local/lib/libopencv_highgui.so \ /usr/local/lib/libopencv_core.so \ /usr/local/lib/libopencv_imgproc.so \

/usr/local/lib/libopencv_imgcodecs.so

2、讀取：

cv::imread(std::string imgpath,cv::mat img)

3、顯示：

cv::imshow(std::string dialogname,cv::mat img)

4、等待：

cv::waitkey(int time)

5、儲存：

cv::imwrite(std::string filename,cv::mat img)

6、縮放：

cv::resize(cv::mat src, cv::mat dst, cv::size dsize, double fx=0, double fy=0, int interpolation=cv::inter_linear );
cv::mat src 原圖 
cv::mat dst 縮放後的圖
cv::size dsize 為0，則按照dsize = size(round(fx*src.cols), round(fy*src.rows))(round函式double取整),不為0則按此尺寸
fx，fy 長寬縮放比
int interpolation 插值方式，預設cv::inter_linear

cv::videocapture cap(std::string videofile);
if (!cap.isopened()) 
cv::mat frame;
//獲取幀長
long frame_num=static_cast(cap.get(cv_cap_prop_frame_count));
double rate = cap.get(cv_cap_prop_fps);
int delay = 1000/rate;
while(true)
if (cap.isopened())

8、呼叫攝像頭

cv::videocapture cap;
cap.open(0);
if(!cap.isopened())
return;
cv::mat frame;
while(1)

if (cap.isopened())
cap.release();

9、擷取roi

//從src擷取roi到dst
cv::mat src(cv::rect roi).copyto(cv::mat dst);

10、畫矩形

cv::rectangle(cv::mat img, rect rec,cv::scalar(0, 0, 255), 2, 8, 0);

11、新增文字

cv::puttext( cv::mat img,std::string text, cv::point org,
int fontface, double fontscale, scalar color,
int thickness = 1, int linetype = line_8,
bool bottomleftorigin = false );

附所有的opencv庫（每台電腦可能不一樣的）：

/usr/local/lib/libopencv_aruco.so \ /usr/local/lib/libopencv_aruco.so\ /usr/local/lib/libopencv_bgsegm.so\ /usr/local/lib/libopencv_bioinspired.so\ /usr/local/lib/libopencv_calib3d.so\ /usr/local/lib/libopencv_ccalib.so\ /usr/local/lib/libopencv_core.so\ /usr/local/lib/libopencv_cudaarithm.so\ /usr/local/lib/libopencv_cudabgsegm.so\ /usr/local/lib/libopencv_cudacodec.so\ /usr/local/lib/libopencv_cudafeatures2d.so\ /usr/local/lib/libopencv_cudafilters.so\ /usr/local/lib/libopencv_cudaimgproc.so\ /usr/local/lib/libopencv_cudalegacy.so\ /usr/local/lib/libopencv_cudaobjdetect.so\ /usr/local/lib/libopencv_cudaoptflow.so\ /usr/local/lib/libopencv_cudastereo.so\ /usr/local/lib/libopencv_cudawarping.so\ /usr/local/lib/libopencv_cudev.so\ /usr/local/lib/libopencv_datasets.so\ /usr/local/lib/libopencv_dnn.so\ /usr/local/lib/libopencv_dpm.so\ /usr/local/lib/libopencv_face.so\ /usr/local/lib/libopencv_face.so.3.1\ /usr/local/lib/libopencv_features2d.so\ /usr/local/lib/libopencv_flann.so\ /usr/local/lib/libopencv_fuzzy.so\ /usr/local/lib/libopencv_hdf.so\ /usr/local/lib/libopencv_highgui.so\ /usr/local/lib/libopencv_imgcodecs.so\ /usr/local/lib/libopencv_imgproc.so\ /usr/local/lib/libopencv_line_descriptor.so\ /usr/local/lib/libopencv_ml.so\ /usr/local/lib/libopencv_objdetect.so\ /usr/local/lib/libopencv_optflow.so\ /usr/local/lib/libopencv_photo.so\ /usr/local/lib/libopencv_plot.so\ /usr/local/lib/libopencv_reg.so\ /usr/local/lib/libopencv_rgbd.so\ /usr/local/lib/libopencv_saliency.so\ /usr/local/lib/libopencv_shape.so\ /usr/local/lib/libopencv_stereo.so\ /usr/local/lib/libopencv_stitching.so\ /usr/local/lib/libopencv_structured_light.so\ /usr/local/lib/libopencv_superres.so\ /usr/local/lib/libopencv_su***ce_matching.so\ /usr/local/lib/libopencv_text.so\ /usr/local/lib/libopencv_tracking.so\ /usr/local/lib/libopencv_videoio.so\ /usr/local/lib/libopencv_video.so\ /usr/local/lib/libopencv_videostab.so\ /usr/local/lib/libopencv_xfeatures2d.so\ /usr/local/lib/libopencv_ximgproc.so\ /usr/local/lib/libopencv_xobjdetect.so\

/usr/local/lib/libopencv_xphoto.so\

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