OpenCV3添加滑动条和鼠标事件到图形界面

鼠标事件和滑动条控制在计算机视觉和OpenCV中非常有用，使用这些控件，用户可以直接与图形界面交互，改变输入图像或者变量的属性值。/*
In this section, we are going to introduce you to the concepts of adding slider and
mouse events for basic interactions. To understand this correctly, we will create a small
project, where we paint green circles in the image using the mouse events and blur the
image with slider.
*/
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
using namespace cv;// Create a variable to save the position value in track
int blurAmount = 15;// Trackbar call back function
static void onChange（int pos, void* userInput）;// Mouse callback
static void onMouse（int event, int x, int y, int, void* userInput）;int main（int argc, const char** argv）
{
// Read images
Mat boy = imread（"../images/eating.jpg"）; // Create windows
namedWindow（"Boy"）; // Create a trackbar
createTrackbar（"Boy", "Boy", &blurAmount, 30, onChange, &boy）; setMouseCallback（"Boy", onMouse, &boy）; // Call to onChange to init
onChange（blurAmount, &boy）; // wait app for a key to exit
waitKey（0）; // Destroy the windows
destroyWindow（"Boy"）; return 0;
}// Trackbar call back function
static void onChange（int pos, void* userInput）
{
if （pos <= 0） return;
// Aux variable for result
Mat imgBlur; // Get the pointer input image
Mat* image = （Mat*）userInput; // Apply a blur filter
blur（*image, imgBlur, Size（pos, pos））; // Show the result
imshow（"Boy", imgBlur）;
}// Mouse callback
static void onMouse（int event, int x, int y, int, void* userInput）
{
if （event ！= EVENT_LBUTTONDOWN） return; // Get the pointer input image
Mat *image = （Mat*）userInput; // Draw circle
circle（*image, Point（x, y）, 10, Scalar（0, 255, 0）, 3）; // Call onChange to get blurred image
onChange（blurAmount, image）;
}程序运行效果如下：OpenCV官方教程中文版（For Python） PDF http://www.linuxidc.com/Linux/2015-08/121400.htmUbuntu Linux下安装OpenCV2.4.1所需包 http://www.linuxidc.com/Linux/2012-08/68184.htmUbuntu 12.04 安装 OpenCV2.4.2 http://www.linuxidc.com/Linux/2012-09/70158.htmCentOS下OpenCV无法读取视频文件 http://www.linuxidc.com/Linux/2011-07/39295.htmUbuntu 12.04下安装OpenCV 2.4.5总结 http://www.linuxidc.com/Linux/2013-06/86704.htmUbuntu 10.04中安装OpenCv2.1九步曲 http://www.linuxidc.com/Linux/2010-09/28678.htm基于QT和OpenCV的人脸识别系统 http://www.linuxidc.com/Linux/2011-11/47806.htm[翻译]Ubuntu 14.04, 13.10 下安装 OpenCV 2.4.9 http://www.linuxidc.com/Linux/2014-12/110045.htmOpenCV的详细介绍：请点这里
OpenCV的下载地址：请点这里本文永久更新链接地址：http://www.linuxidc.com/Linux/2016-05/131621.htm