OpenCV 画点/圆/文本/直线/十字

Point

cv::circle 官方文档地址

void cv::circle	(InputOutputArray 	img,
	Point 	center,
	int 	radius,
	const Scalar & 	color,
	int 	thickness = 1,
	int 	lineType = LINE_8,
	int 	shift = 0 
  )

Parameters

img	Image where the circle is drawn.
center	Center of the circle.
radius	Radius of the circle.
color	Circle color.
thickness	Thickness of the circle outline, if positive. Negative values, like FILLED, mean that a filled circle is to be drawn.
lineType	Type of the circle boundary. See LineTypes
shift	Number of fractional bits in the coordinates of the center and in the radius value.

demo

int thickness = 1;
cv::Mat showMarker = cv::imread(rgb_path);
cv::circle(showMarker, cv::Point2i(int(charuco_u), int(charuco_v)), 10, cv::Scalar(0,0,255), thickness,LINE_8);
cv::namedWindow("marker", WINDOW_NORMAL);
cv::resizeWindow("marker", int(1920), int(1080));
cv::imshow("marker", showMarker);
cv::waitKey(0);

Line

cv::line(showProj, cv::Point(u, v), cv::Point(leftImg.cols + cur_u, cur_v), Scalar(0, 0, 255), 3);

text

opencv-putText

Parameters

img	Image.
text	Text string to be drawn.
org	Bottom-left corner of the text string in the image.
fontFace	Font type, see HersheyFonts.
fontScale	Font scale factor that is multiplied by the font-specific base size.
color	Text color.
thickness	Thickness of the lines used to draw a text.
lineType	Line type. See LineTypes
bottomLeftOrigin	When true, the image data origin is at the bottom-left corner. Otherwise, it is at the top-left corner.

cv::putText(src,"Hello ",Point(100,100),FONT_HERSHEY_SIMPLEX,2,Scalar(0,0,255),4,8);