OpenCV 提供了许多绘图函数，可用于绘制几何形状和在图像上书写文本。
该putText函数可用于通过指定 x 和 y 坐标、字体系列、字体比例和其他参数在图像上书写文本。
import cv2
import numpy as np
img = np.zeros((100, 300, 3), dtype=np.uint8)
x, y = 120, 50
font = cv2.FONT_HERSHEY_SIMPLEX
fontScale = 1.0
color = (0, 255, 0)
thickness = 2
cv2.putText(img, 'Test', (x, y), font, fontScale, color, thickness)
cv2.imshow('Image', img)
cv2.waitKey(0)
cv2.destroyAllWindows()#include <opencv2/opencv.hpp>
using namespace cv;
int main()
{
Mat img = Mat::zeros(100, 300, CV_8UC3);
int x = 120, y = 50;
int font = FONT_HERSHEY_SIMPLEX;
double fontScale = 1.0;
Scalar color(0, 255, 0);
int thickness = 2;
putText(img, "Test", Point(x, y), font, fontScale, color, thickness);
imshow("Image", img);
waitKey(0);
destroyAllWindows();
return 0;
}package app;
import org.opencv.core.*;
import org.opencv.highgui.HighGui;
import org.opencv.imgproc.Imgproc;
public class Main
{
static { System.loadLibrary(Core.NATIVE_LIBRARY_NAME); }
public static void main(String[] args)
{
Mat img = Mat.zeros(100, 300, CvType.CV_8UC3);
int x = 120, y = 50;
int font = Imgproc.FONT_HERSHEY_SIMPLEX;
double fontScale = 1.0;
Scalar color = new Scalar(0, 255, 0);
int thickness = 2;
Imgproc.putText(img, "Test", new Point(x, y), font, fontScale, color, thickness);
HighGui.imshow("Image", img);
HighGui.waitKey(0);
HighGui.destroyAllWindows();
System.exit(0);
}
}结果：
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