代码为转载，出处找不到了，不贴了
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代码语言：javascript复制// ConvertColor.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <iostream>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#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
const int slider_max = 100;
int slider;
Mat img;
// Callback function for trackbar event
void 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：
代码语言：javascript复制// ConvertColor.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <iostream>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#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 activity
bool ldown = false, lup = false;
// Original image
Mat img;
// Starting and ending points of the user's selection
Point corner1, corner2;
// ROI
Rect box;
// Callback function for mouse events
static 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：
