我正在使用OpenCV进行C应用程序 . 我正在使用连接组件进行对象检测 . 我想在原始框架中围绕对象绘制一个矩形 . 我可以在组件窗口中绘制矩形 . 我在灰度图像中绘制一个颜色矩形?在下面我写了部分代码 . 谢谢你的帮助 .
Mat frame;
Mat stat, centroid;
int threshval = 100;
static void on_trackbar(int, void*){
Mat bw = threshval < 128 ? (frame < threshval) : (frame > threshval);
Mat labelImage(frame.size(), CV_32S);
int nLabels = connectedComponentsWithStats(bw, labelImage, stat, centroid, 8);
std::vector<Vec3b> colors(nLabels);
colors[0] = Vec3b(0, 0, 0);//background
for (int label = 1; label < nLabels; ++label) {
colors[label] = Vec3b((rand() & 255), (rand() & 255), (rand() & 255));}
at dst(frame.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];}
for (int i = 0;i < nLabels;i++)
{
vector<Rect> rComp;
rComp.push_back(Rect(Point((stat.at<int>(i, CC_STAT_LEFT) ), (stat.at<int>(i, CC_STAT_TOP) )), Size((stat.at<int>(i, CC_STAT_WIDTH) ), (stat.at<int>(i, CC_STAT_HEIGHT)))));
//
rectangle(dst, Rect(Point(stat.at<int>(i, CC_STAT_LEFT ) , stat.at<int>(i, CC_STAT_TOP ) ), Size(stat.at<int>(i, CC_STAT_WIDTH ) , stat.at<int>(i, CC_STAT_HEIGHT ))), Scalar(0, 255, 255));}
}
for (int i = 0;i < nLabels;i++) {
int x = stat.at<int>(i, CC_STAT_LEFT);
int y = stat.at<int>(i, CC_STAT_TOP);
int w = stat.at<int>(i, CC_STAT_WIDTH) ;
int h = stat.at<int>(i, CC_STAT_HEIGHT);
rectangle(frame, Rect(x,y,w,h), Scalar(0, 255, 255));
}
}
imshow("Connected Components", dst);
1 回答
如上所述here和here,您无法在灰度图像上绘制彩色矩形 . 您可以使用标量(255,255,255) - 白色/标量(0,0,0)或跟随第一个链接中的黑客 .