如何使用OpenCV使用鼠标绘制绑定框,从图像中裁剪多个对象。请参阅下图:
我想用鼠标点击选择焦炭罐边界并裁剪它们。
需要解决方案来绘制多个多边形来选择对象:
我能够绘制单个多边形而不是多个。这是代码:
void mouseHandler(int event,int x,int y,int,void *) {
int[] imageId = {
R.drawable.image1,
R.drawable.image2,
R.drawable.image3,
R.drawable.image4,
R.drawable.image5,
R.drawable.image6,
R.drawable.image7
}
int main() {
if (event == EVENT_LBUTTONDOWN && !drag)
{
if (flag1 == 0)
{
if (var == 0)
img1 = img0.clone();
point = Point(x, y);
circle(img1, point, 2, Scalar(0, 0, 255), -1, 8, 0);
pts[var] = point;
var++;
drag = 1;
if (var>1)
line(img1, pts[var - 2], point, Scalar(0, 0, 255), 2, 8, 0);
imshow("Source", img1);
}
}
if (event == EVENT_LBUTTONUP && drag)
{
imshow("Source", img1);
drag = 0;
}
if (event == EVENT_RBUTTONDOWN)
{
flag1 = 1;
img1 = img0.clone();
for (int i = var; i < numpts; i++)
pts[i] = point;
if (var != 0)
{
const Point* pts3[1] = { &pts[0] };
polylines(img1, pts3, &numpts, 1, 1, Scalar(0, 0, 0), 2, 8, 0);
}
for (int i = 0; i<var; i++)
{
minx = min(minx, pts[i].x);
maxx = max(maxx, pts[i].x);
miny = min(miny, pts[i].y);
maxy = max(maxy, pts[i].y);
}
lenx = maxx - minx;
leny = maxy - miny;
imshow("Source", img1);
}
if (event == EVENT_RBUTTONUP)
{
flag = var;
final = Mat::zeros(img0.size(), CV_8UC3);
res1 = Mat::zeros(img0.size(), CV_8UC1);
const Point* pts4[1] = { &pts[0] };
fillPoly(res1, pts4, &numpts, 1, Scalar(255, 255, 255), 8, 0);
bitwise_and(img0, img0, final, res1);
imshow("mask", res1);
imwrite("mask.png", res1);
imshow("Source", img1);
}
if (event == EVENT_MBUTTONDOWN)
{
for (int i = 0; i < numpts; i++)
{
pts[i].x = 0;
pts[i].y = 0;
}
var = 0;
flag1 = 0;
minx = INT_MAX; miny = INT_MAX; maxx = INT_MIN; maxy = INT_MIN;
imshow("Source", img0);
drag = 0;
}
}
答案 0 :(得分:1)
如果您只想绘制矩形,可以参考this answer中的代码。
如果您需要绘制多边形,请查看下面的代码。您可以使用鼠标左键单击绘制多边形顶点。左键双击将关闭多边形,然后开始一个新的多边形。
请注意,添加删除顶点的选项可能会有所帮助,例如删除最靠近鼠标右键的顶点。
底部将向您展示如何保存裁剪的图像。
代码:
$(document).on('click','input.chk',function(){
// getting the tds with in the rows in which check exists
$tds=$(this).parent().siblings();
if($(this).is(':checked'))
{
$data=$($tds[$tds.length-1]).text();
alert($data);
}
})