在OpenCV中绘制矩形 [英] Draw rectangle in OpenCV
问题描述
我想使用此功能在OpenCV中绘制一个矩形:
I want to draw a rectangle in OpenCV by using this function:
rectangle(Mat& img, Rect rec, const Scalar& color, int thickness=1, int lineType=8, int shift=0 )
但是当我使用它时,我遇到了一些错误.我的问题是:任何人都可以用示例解释该功能吗?我找到了一些示例,但具有另一个功能:
But when I use it I am facing some errors. My question is: can anyone explain the function with an example? I found some examples but with another function:
rectangle(Mat& img, Point pt1, Point pt2, const Scalar& color, int thickness=1, int lineType=8, int shift=0)
关于第二个功能的此示例:
This example on the second function:
rectangle(image, pt2, pt1, Scalar(0, 255, 0), 2, 8, 0);
我了解此功能,但是使用第一个功能时,我遇到了参数Rect
中的问题.我不知道该如何致命?
This function I understand, but with the first function I'm facing a problem in parameter Rect
. I don't know how I can deadlier it?
推荐答案
接受两个cv::Point
的cv::rectangle
函数采用矩形的左上角和右下角(分别位于矩形中的pt1和pt2 文档).如果该矩形与接受cv::Rect
的cv::rectangle
函数一起使用,那么您将获得相同的结果.
The cv::rectangle
function that accepts two cv::Point
's takes both the top left and the bottom right corner of a rectangle (pt1 and pt2 respectively in the documentation). If that rectangle is used with the cv::rectangle
function that accepts a cv::Rect
, then you will get the same result.
// just some valid rectangle arguments
int x = 0;
int y = 0;
int width = 10;
int height = 20;
// our rectangle...
cv::Rect rect(x, y, width, height);
// and its top left corner...
cv::Point pt1(x, y);
// and its bottom right corner.
cv::Point pt2(x + width, y + height);
// These two calls...
cv::rectangle(img, pt1, pt2, cv::Scalar(0, 255, 0));
// essentially do the same thing
cv::rectangle(img, rect, cv::Scalar(0, 255, 0))
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