OpenCV裁剪图像与椭圆 [英] OpenCV crop image with ellipse
问题描述
我有一个大小为 92x112的图像(cv :: Mat)。我想用椭圆包围这个图像中的对象,然后只得到这个像素来创建另一个只包含对象的图片。
我的意思是,用椭圆裁剪原始图片。
这是可能吗?
我试图画一个椭圆,但是椭圆没有绘制完整,有:
椭圆(escalada,Point(92 / 2,112 / 2),Size(92/2 * 0.95,112 / 2 * 0.85),0.0,90.0,0.0,Scalar (255,0,0),3,8);
并使用 cvSetImageROI
图像,但此方法仅适用于 cvRect
。
一些想法?
我用这个解决:
imagen = imread nombre_imagen,0); // read image(grayscale)
//使用旧的C接口
IplImage * res,* roi;
IplImage src(imagen);
res = cvCreateImage(Size(imagen.rows,imagen.cols),8,1);
roi = cvCreateImage(Size(imagen.rows,imagen.cols),8,1);
cvZero(roi);
cvEllipse(roi,cvPoint(src.width / 2,src.height / 2),cvSize(src.width / 2 * 0.85,src.height / 2 * 0.95),0.0,0.0,360.0,CV_RGB 255,255,255), - 1,8,0);
cvAnd(& src,& src,res,roi);
cvReleaseImage(& roi);
然后在res变量我有一个图像显示投资回报率椭圆和其余的黑色。 / p>
I have an image (cv::Mat) with size of 92x112
I want to surround the object in this image with a ellipse then get only this pixels to create another image containing only the object.
I mean, cropping the original image with a ellipse. It's possible?
I am trying drawing a ellipse, but the ellipse don't draw complete, with that:
ellipse(escalada, Point(92/2,112/2), Size(92/2*0.95,112/2*0.85), 0.0, 90.0, 0.0, Scalar(255,0,0), 3, 8);
and made some test with cvSetImageROI
to crop the image, but this method works only with cvRect
.
Some idea?
I solve using this:
imagen = imread(nombre_imagen,0); //read image (grayscale)
//Use old C interface
IplImage *res,*roi;
IplImage src(imagen);
res = cvCreateImage(Size(imagen.rows,imagen.cols),8,1);
roi = cvCreateImage(Size(imagen.rows,imagen.cols),8,1);
cvZero(roi);
cvEllipse(roi,cvPoint(src.width/2,src.height/2),cvSize(src.width/2*0.85,src.height/2*0.95),0.0,0.0,360.0,CV_RGB(255,255,255),-1,8,0);
cvAnd(&src, &src, res, roi);
cvReleaseImage(&roi);
then in res variable i have a image showing the ROI with a ellipse and the rest in black.
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