我需要比较2张图片才能在其中找到相似的线条。在两张图片中,我都使用LSD(线段检测器)方法,然后找到线,并且知道每条线的起点和终点的坐标。
我的问题是:OpenCV中是否有任何函数可以查找每条线的斜率和长度,以便我可以轻松比较它们?
我的环境是:OpenCV 3.1,C++和Visual Studio 2015
最佳答案
好吧,这是一个数学问题。
假设您有两点:p(x,y)
和p(x,y)
。就像调用点一样,我们将p
称为线段的“开始”,并将p
称为线段的“结束”。
slope = (y - y) / (x - x) length = norm(p - p)
Sample code:
cv::Point p1 = cv::Point(5,0); // "start"
cv::Point p2 = cv::Point(10,0); // "end"
// we know this is a horizontal line, then it should have
// slope = 0 and length = 5. Let's see...
// take care with division by zero caused by vertical lines
double slope = (p2.y - p1.y) / (double)(p2.x - p1.x);
// (0 - 0) / (10 - 5) -> 0/5 -> slope = 0 (that's correct, right?)
double length = cv::norm(p2 - p1);
// p_2 - p_1 = (5, 0)
// norm((0,5)) = sqrt(5^2 + 0^2) = sqrt(25) -> length = 5 (that's correct, right?)
关于c++ - OpenCV中2点之间的直线的斜率和长度,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/37472810/