Opencv實(shí)現(xiàn)鼠標(biāo)事件與窗口互動(dòng)功能過(guò)程
1.opencv API及參數(shù)介紹
cv::setMouseCallback(const string& windowname, MouseCallback onMouse, void* userdata=0) { .... } // windowname: 要操作的窗口名稱 // onMouse: 鼠標(biāo)事件函數(shù),鼠標(biāo)事件發(fā)生以后,要執(zhí)行的回調(diào)函數(shù)。函數(shù)原型是 // void onMouse(int event, int x, int y, int flags, void * para) // userdata: 回調(diào)函數(shù)的參數(shù)
鼠標(biāo)回調(diào)函數(shù)介紹:
void onMouse(int event, int x, int y, int flags, void *para) // int event: 鼠標(biāo)事件,見(jiàn)后續(xù)說(shuō)明 // x, y 是鼠標(biāo)在圖像坐標(biāo)系中的坐標(biāo) // flags : // para: 是用戶傳遞到回調(diào)函數(shù)中的參數(shù)
截取感興趣區(qū)域ROI:
cv::selectROIs("MultiTracker", frame, bboxes_, showCrosshair, fromCenter); // “MultiTracker” : windowsName // frame: 當(dāng)前畫(huà)面;格式為cv::Mat // bboxes: 要存儲(chǔ)的框框格式為:std::vector<cv::Rect> // showCrosshair:默認(rèn)為True // fromCenter:從中心點(diǎn)還是從對(duì)角點(diǎn),默認(rèn)為false,為true時(shí),選框從中心點(diǎn)開(kāi)始
涉及的相關(guān)參數(shù):
// EVENT的參數(shù)定義 enum { CV_EVENT_MOUSEMOVE =0,//滑動(dòng) CV_EVENT_LBUTTONDOWN =1,//左鍵點(diǎn)擊 CV_EVENT_RBUTTONDOWN =2,//右鍵點(diǎn)擊 CV_EVENT_MBUTTONDOWN =3,//中鍵點(diǎn)擊 CV_EVENT_LBUTTONUP =4,//左鍵放開(kāi) CV_EVENT_RBUTTONUP =5,//右鍵放開(kāi) CV_EVENT_MBUTTONUP =6,//中鍵放開(kāi) CV_EVENT_LBUTTONDBLCLK =7,//左鍵雙擊 CV_EVENT_RBUTTONDBLCLK =8,//右鍵雙擊 CV_EVENT_MBUTTONDBLCLK =9//中鍵雙擊 };
enum { CV_EVENT_FLAG_LBUTTON =1,//左鍵拖拽 CV_EVENT_FLAG_RBUTTON =2,//右鍵拖拽 CV_EVENT_FLAG_MBUTTON =4,//中鍵拖拽 CV_EVENT_FLAG_CTRLKEY =8,//按CTRL不放 CV_EVENT_FLAG_SHIFTKEY =16,//按SHIFT不放 CV_EVENT_FLAG_ALTKEY =32//按ALT不放 };
或者python-opencv中的參數(shù)也相同:
# mouse callback function def mouse_event(event, x, y, flags, param): ''' :param event: 點(diǎn)擊事件標(biāo)識(shí) :param x: 坐標(biāo)x :param y: 坐標(biāo)y :param flags:按鍵事件標(biāo)識(shí) :param param: 攜帶參數(shù) :return: ''' if flags == cv2.EVENT_FLAG_ALTKEY: print('摁住Alt') if flags == cv2.EVENT_FLAG_CTRLKEY: print('摁住Ctrl') if flags == cv2.EVENT_FLAG_SHIFTKEY: print('摁住Shift') if flags == cv2.EVENT_FLAG_LBUTTON: print('摁住左鍵') if flags == cv2.EVENT_FLAG_MBUTTON: print('摁住中鍵') if flags == cv2.EVENT_FLAG_RBUTTON: print('摁住右鍵') if event == cv2.EVENT_LBUTTONDBLCLK: print('左鍵雙擊') if event == cv2.EVENT_MBUTTONDBLCLK: print('中鍵雙擊') if event == cv2.EVENT_RBUTTONDBLCLK: print('右鍵雙擊') if event == cv2.EVENT_LBUTTONDOWN: print('左鍵擊下') if event == cv2.EVENT_LBUTTONUP: print('左鍵彈起') if event == cv2.EVENT_MBUTTONDOWN: print('中鍵擊下') if event == cv2.EVENT_MBUTTONUP: print('中鍵彈起') if event == cv2.EVENT_RBUTTONDOWN: print('右鍵擊下') if event == cv2.EVENT_RBUTTONUP: print('右鍵彈起') if event == cv2.EVENT_MOUSEWHEEL: if flags > 0: print('向前滾動(dòng)') else: print('向后滾動(dòng)') if event == cv2.EVENT_MOUSEHWHEEL: if flags > 0: print('向左滾動(dòng)') # 按住Alt else: print('向右滾動(dòng)') if __name__ == '__main__': img = np.mat(np.zeros((300, 300, 3), np.uint8)) # 構(gòu)造一個(gè)像素值全為1的圖形 cv2.namedWindow('mouse') #命名窗口為mouse cv2.setMouseCallback('mouse', mouse_event) # 窗口與回調(diào)函數(shù)綁定 while True: cv2.imshow('mouse', img) if cv2.waitKey(1) & 0xFF == ord('q'): # 摁下q退出 break cv2.destroyAllWindows() #銷毀所有窗口
2.一個(gè)可以繪制矩形和控制縮放的demo
#include <opencv2/opencv.hpp> using namespace std; using namespace cv; #define WINNAME "畫(huà)板" struct MouseParam { Mat img; //用于畫(huà)好一個(gè)后顯示 Mat imgZoomBackup; //用于zoom的還原備份 Mat imgTmp; //用于實(shí)時(shí)顯示 Mat imgBackup; //清空,顯示最初的圖 Point pt1; Point pt2; bool mouseLflag; float scale; }; //繪制矩形 void draw_rectangle(Mat& img, const Point& pt1, const Point& pt2) { rectangle(img, pt1, pt2, Scalar(0, 255, 0), 1, 0, 0); } //繪制十字線:即過(guò)一點(diǎn)的水平、豎直線 void draw_crossline(Mat& img, const Point& pt) { int width = img.cols; int height = img.rows; cv::Point ptv1; cv::Point ptv2; cv::Point pth1; cv::Point pth2; ptv1 = cv::Point(pt.x, 0); ptv2 = cv::Point(pt.x, height); pth1 = cv::Point(0, pt.y); pth2 = cv::Point(width, pt.y); cv::line(img, ptv1, ptv2, Scalar(255, 255, 0), 1); cv::line(img, pth1, pth2, Scalar(255, 255, 0), 1); } /* * func:實(shí)現(xiàn)圖像繞某一點(diǎn)進(jìn)行縮放功能 */ void zoom(Mat& img, const Mat& srcimg, const Point& pt, const float scale) { int x1, y1, x2, y2; int width, height; width = (int)(srcimg.cols * scale / 2.0); height = (int)(srcimg.rows * scale / 2.0); x1 = max(pt.x - width, 0); y1 = max(pt.y - height, 0); x2 = min(pt.x + width, srcimg.cols); y2 = min(pt.y + height, srcimg.rows); Rect zoomRect(Point(x1, y1), Point(x2, y2)); img = srcimg(zoomRect).clone(); } void on_mouse(int event, int x, int y, int flags, void* param) { MouseParam* par = (MouseParam*)param; Point pt(x, y); double value; float step = 0.05; if (event == EVENT_RBUTTONDOWN) //按下右鍵,重畫(huà) { par->img = par->imgBackup.clone(); } else if (event == EVENT_LBUTTONDOWN) //按下左鍵 { par->pt1 = pt; par->pt2 = pt; par->mouseLflag = true; } else if (event == EVENT_MOUSEMOVE && flags == EVENT_FLAG_LBUTTON) //按下左鍵并移動(dòng) { par->pt2 = pt; } else if (event == EVENT_LBUTTONUP)//左鍵放開(kāi)進(jìn)行繪制矩形框 { par->pt2 = pt; draw_rectangle(par->img, par->pt1, par->pt2); //par->imgZoomBackup = par->img.clone(); par->mouseLflag = false; } else if (event == EVENT_MOUSEMOVE) //鼠標(biāo)移動(dòng)將顯示十字線 { par->pt1 = pt; } else if (event == EVENT_MOUSEWHEEL) //鼠標(biāo)滾動(dòng) { value = getMouseWheelDelta(flags); if (value > 0) //滾輪向前滾動(dòng),設(shè)為縮小 par->scale += step; else if (value < 0) //鼠標(biāo)向后滾動(dòng),設(shè)為放大 par->scale -= step; par->scale = max((float)0.3, par->scale); par->scale = min((float)1.0, par->scale); zoom(par->img, par->imgZoomBackup, par->pt1, par->scale); } } int main() { //Mat img(512, 512, CV_8UC3, Scalar::all(255)); Mat img = imread("./imgs/1/L.png"); MouseParam mouseParam; mouseParam.img = img.clone(); mouseParam.imgBackup = img.clone(); mouseParam.imgZoomBackup = img.clone(); mouseParam.mouseLflag = false; float step = 0.05; mouseParam.scale = 1.0; namedWindow(WINNAME, 0); setMouseCallback(WINNAME, on_mouse, &mouseParam); int key; while (1) { mouseParam.imgTmp = mouseParam.img.clone(); draw_crossline(mouseParam.imgTmp, mouseParam.pt1); if (mouseParam.mouseLflag == true) draw_rectangle(mouseParam.imgTmp, mouseParam.pt1, mouseParam.pt2); imshow(WINNAME, mouseParam.imgTmp); key = waitKey(40); if (key == 27) { break; } else if (key == toascii('q')) { mouseParam.scale -= step; zoom(mouseParam.img, mouseParam.imgZoomBackup, mouseParam.pt1, mouseParam.scale); } else if (key == toascii('e')) { mouseParam.scale += step; zoom(mouseParam.img, mouseParam.imgZoomBackup, mouseParam.pt1, mouseParam.scale); } } return 0; }
3.圖象中畫(huà)點(diǎn)
- 對(duì)于拼接后的圖像顯示窗口,依次繪制左右圖中的對(duì)應(yīng)點(diǎn)程序
- 右鍵刪除尚未調(diào)通
std::vector<cv::Point2f>pointsL; //依次存放左右圖中的對(duì)應(yīng)點(diǎn) std::vector<cv::Point2f>pointsR; cv::Mat mask; cv::Point2f p_; //鼠標(biāo)回調(diào)函數(shù) void on_mouse(int event, int x, int y, int flags, void* param) { float cols = mask.cols/2; int rad = 6; if (event == cv::EVENT_LBUTTONUP || !(flags & cv::EVENT_FLAG_LBUTTON)) cv::Point2f pt = cv::Point2f(-10, -10); else if (event == cv::EVENT_LBUTTONDOWN) { cv::Point2f pt(x, y); if (pt.x>=0&&pt.x <= cols) { pointsL.push_back(pt); cv::circle(mask, pt, rad, cv::Scalar(0, 255, 0), 2); } else { pointsR.push_back(pt); cv::circle(mask, pt, rad, cv::Scalar(0, 0, 255), 2); } //cv::circle(mask, pt, 2, cv::Scalar(0, 255, 0), 2); cv::imshow("image", mask); } else if (event == cv::EVENT_RBUTTONDOWN) //按下右鍵,重畫(huà) { cv::Point2f pt(x, y); if (pointsL.size()>0) { pointsL.pop_back(); } else if (pointsR.size() > 0) { pointsR.pop_back(); } } std::cout << "pointsL" << std::endl; for (int i = 0; i < pointsL.size(); ++i) { std::cout << pointsL[i] << std::endl; } std::cout << "pointsR" << std::endl; for (int i = 0; i < pointsR.size(); ++i) { std::cout << pointsR[i] << std::endl; } }
4.opencv例程分水嶺分割中的界面應(yīng)用
鼠標(biāo)時(shí)間包含繪制直線的交互操作
static void help(char** argv) { cout << "\nThis program demonstrates the famous watershed segmentation algorithm in OpenCV: watershed()\n" "Usage:\n" << argv[0] << " [image_name -- default is fruits.jpg]\n" << endl; cout << "Hot keys: \n" "\tESC - quit the program\n" "\tr - restore the original image\n" "\tw or SPACE - run watershed segmentation algorithm\n" "\t\t(before running it, *roughly* mark the areas to segment on the image)\n" "\t (before that, roughly outline several markers on the image)\n"; } Mat markerMask, img; Point prevPt(-1, -1); static void onMouse(int event, int x, int y, int flags, void*) { if (x < 0 || x >= img.cols || y < 0 || y >= img.rows) return; if (event == EVENT_LBUTTONUP || !(flags & EVENT_FLAG_LBUTTON)) prevPt = Point(-1, -1); else if (event == EVENT_LBUTTONDOWN) prevPt = Point(x, y); else if (event == EVENT_MOUSEMOVE && (flags & EVENT_FLAG_LBUTTON)) { Point pt(x, y); if (prevPt.x < 0) prevPt = pt; line(markerMask, prevPt, pt, Scalar(12,234,12), 40, 8, 0); line(img, prevPt, pt, Scalar(12,234,12), 40, 8, 0); prevPt = pt; imshow("image", img); } } int main(int argc, char** argv) { cv::CommandLineParser parser(argc, argv, "{help h | | }{ @input | fruits.jpg | }"); if (parser.has("help")) { help(argv); return 0; } //string filename = samples::findFile(parser.get<string>("@input")); Mat img0 = imread("..."), imgGray; if (img0.empty()) { cout << "Couldn't open image "; help(argv); return 0; } help(argv); //img0 = img0(Rect(1000, 1000, 800, 800)); namedWindow("image", WINDOW_NORMAL); img0.copyTo(img); cvtColor(img, markerMask, COLOR_BGR2GRAY); cvtColor(markerMask, imgGray, COLOR_GRAY2BGR); markerMask = Scalar::all(0); imshow("image", img); setMouseCallback("image", onMouse, 0); for (;;) { char c = (char)waitKey(0); if (c == 27) break; if (c == 'r') { markerMask = Scalar::all(0); img0.copyTo(img); namedWindow("image", WINDOW_NORMAL); imshow("image", img); } if (c == 'w' || c == ' ') { //對(duì)繪制完成的圖像進(jìn)行下一步操作 //須在鍵入相應(yīng)按鍵后執(zhí)行 } } return 0; }
到此這篇關(guān)于Opencv實(shí)現(xiàn)鼠標(biāo)事件與窗口互動(dòng)功能過(guò)程的文章就介紹到這了,更多相關(guān)Opencv鼠標(biāo)事件與窗口互動(dòng)內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家!
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