代码为转载，出处找不到了，不贴了
工具条进度条：
// ConvertColor.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include#include #include #pragma comment(lib,"opencv_core2410d.lib") #pragma comment(lib,"opencv_highgui2410d.lib") #pragma comment(lib,"opencv_imgproc2410d.lib") using namespace std;using namespace cv;// Global variablesconst int slider_max = 100;int slider;Mat img;// Callback function for trackbar eventvoid on_trackbar(int pos, void *){ Mat img_converted; if(pos > 0) cvtColor(img, img_converted, CV_RGB2GRAY); else img_converted = img; imshow("Trackbar app", img_converted);}int main(){ img = imread("swan.jpg"); namedWindow("Trackbar app"); imshow("Trackbar app", img); slider = 0; createTrackbar("RGB <-> Grayscale", "Trackbar app", &slider, slider_max, on_trackbar); while(char(waitKey(1)) != 'q') {} return 0;}
效果：
图像裁切代码：
// ConvertColor.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include#include #include #pragma comment(lib,"opencv_core2410d.lib") #pragma comment(lib,"opencv_highgui2410d.lib") #pragma comment(lib,"opencv_imgproc2410d.lib") using namespace std;using namespace cv;// Global variables// Flags updated according to left mouse button activitybool ldown = false, lup = false;// Original imageMat img;// Starting and ending points of the user's selectionPoint corner1, corner2;// ROIRect box;// Callback function for mouse eventsstatic void mouse_callback(int event, int x, int y, int, void *){ // When the left mouse button is pressed, record its position and save it in corner1 if(event == EVENT_LBUTTONDOWN) { ldown = true; corner1.x = x; corner1.y = y; cout << "Corner 1 recorded at " << corner1 << endl; } // When the left mouse button is released, record its position and save it in corner2 if(event == EVENT_LBUTTONUP) { // Also check if user selection is bigger than 20 pixels (jut for fun!) if(abs(x - corner1.x) > 20 && abs(y - corner1.y) > 20) { lup = true; corner2.x = x; corner2.y = y; cout << "Corner 2 recorded at " << corner2 << endl << endl; } else { cout << "Please select a bigger region" << endl; ldown = false; } } // Update the box showing the selected region as the user drags the mouse if(ldown == true && lup == false) { Point pt; pt.x = x; pt.y = y; Mat local_img = img.clone(); rectangle(local_img, corner1, pt, Scalar(0, 0, 255)); imshow("Cropping app", local_img); } // Define ROI and crop it out when both corners have been selected if(ldown == true && lup == true) { box.width = abs(corner1.x - corner2.x); box.height = abs(corner1.y - corner2.y); box.x = min(corner1.x, corner2.x); box.y = min(corner1.y, corner2.y); // Make an image out of just the selected ROI and display it in a new window Mat crop(img, box); namedWindow("Crop"); imshow("Crop", crop); ldown = false; lup = false; }}int main(){ img = imread("swan.jpg"); namedWindow("Cropping app"); imshow("Cropping app", img); // Set the mouse event callback function setMouseCallback("Cropping app", mouse_callback); // Exit by pressing 'q' while(char(waitKey(1)) != 'q') {} return 0;}
裁切效果：
