opencv画直线函数运用

opencv中画直线函数可以很方便的绘制出直线。有颜色、线宽、类型等属性可设置。

介绍下opencv画直线函数原型:

/** @brief Draws a line segment connecting two points.

The function line draws the line segment between pt1 and pt2 points in the image. The line is

clipped by the image boundaries. For non-antialiased lines with integer coordinates, the 8-connected

or 4-connected Bresenham algorithm is used. Thick lines are drawn with rounding endings. Antialiased

lines are drawn using Gaussian filtering.

@param img Image.

@param pt1 First point of the line segment.

@param pt2 Second point of the line segment.

@param color Line color.

@param thickness Line thickness.

@param lineType Type of the line. See #LineTypes.

@param shift Number of fractional bits in the point coordinates.

CV_EXPORTS_W void line(InputOutputArray img, Point pt1, Point pt2, const Scalar& color,

int thickness = 1, int lineType = LINE_8, int shift = 0);

画直线测试代码:

Mat image(500,500,CV_8UC3);

cv::imshow("Image", image);

TDraw draw(image);

line(image,Point(0, 0), Point(500, 500), ColorBlue);

line(image,Point(0, 50), Point(500, 50), ColorBlue, 1, LINE_AA);

line(image,Point(0, 150), Point(500, 150), ColorBlue, 1, FILLED);

line(image,Point(0, 250), Point(500, 250), ColorBlue, 1, LINE_4);

cv::imshow("Image", image);

opencv画直线测试结果: