效果：拉动zoomBar，可以使一张图像进行渐变色，视频也如此。
应用：广场上的字变色过程，图像魔术等。
代码：
代码语言：javascript复制#include <opencv2/core/utility.hpp>
#include "opencv2/imgproc.hpp"
#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui.hpp"
#include <iostream>
using namespace cv;
using namespace std;
Mat img;
int threshval = 100;
static void on_trackbar(int, void*)
{
Mat bw = threshval < 128 ? (img < threshval) : (img > threshval);
Mat labelImage(img.size(), CV_32S);
int nLabels = connectedComponents(bw, labelImage, 8);//0,255的bw图变成0,1,2不同区域表示
std::vector<Vec3b> colors(nLabels);
colors[0] = Vec3b(0, 0, 0);//background
for(int label = 1; label < nLabels; label){//label从1开始，因为0所在区域是背景
colors[label] = Vec3b( (rand()&255), (rand()&255), (rand()&255) );//不同区域显示颜色
}
Mat dst(img.size(), CV_8UC3);
for(int r = 0; r < dst.rows; r){
for(int c = 0; c < dst.cols; c){
int label = labelImage.at<int>(r, c);
Vec3b &pixel = dst.at<Vec3b>(r, c);
pixel = colors[label];//dst画板上涂色
}
}
imshow( "Connected Components", dst );
}
int main( int argc, const char** argv )
{
CommandLineParser parser(argc, argv, "{@image|stuff.jpg|image for converting to a grayscale}");
parser.about("nThis program demonstrates connected components and use of the trackbarn");
parser.printMessage();
cout << "nThe image is converted to grayscale and displayed, another image has a trackbarn"
"that controls thresholding and thereby the extracted contours which are drawn in colorn";
String inputImage = parser.get<string>(0);
img = imread(inputImage, IMREAD_GRAYSCALE);
if(img.empty())
{
cout << "Could not read input image file: " << inputImage << endl;
return EXIT_FAILURE;
}
imshow( "Image", img );
namedWindow( "Connected Components", WINDOW_AUTOSIZE);
createTrackbar( "Threshold", "Connected Components", &threshval, 255, on_trackbar );
on_trackbar(threshval, 0);//先执行一次出图 0无意义装饰品
waitKey(0);
return EXIT_SUCCESS;
}输入：
输出：
