如何輕鬆檢測2個ROI是否與OpenCv相交？

Question

我試圖檢測2個感興趣區域（CvRect s）是否在OpenCV中相互交叉。我顯然可以手動輸入幾個（或更多）條件進行檢查，但這並不是一個好辦法（imo）。

任何人都可以建議我任何其他解決方案嗎？ OpenCV中有沒有現成的方法？

Answer 1

我不知道C接口（CvRect）任何現成的解決方案，但如果你使用C++的方式（cv::Rect），你可以很容易地說

interesect = r1 & r2; 

上矩形

操作的complete list是

// In addition to the class members, the following operations 
// on rectangles are implemented: 

// (shifting a rectangle by a certain offset) 
// (expanding or shrinking a rectangle by a certain amount) 
rect += point, rect -= point, rect += size, rect -= size (augmenting operations) 
rect = rect1 & rect2 (rectangle intersection) 
rect = rect1 | rect2 (minimum area rectangle containing rect2 and rect3) 
rect &= rect1, rect |= rect1 (and the corresponding augmenting operations) 
rect == rect1, rect != rect1 (rectangle comparison) 

Answer 2

bool cv::overlapRoi(Point tl1, Point tl2, Size sz1, Size sz2, Rect &roi) 
{ 
    int x_tl = max(tl1.x, tl2.x); 
    int y_tl = max(tl1.y, tl2.y); 
    int x_br = min(tl1.x + sz1.width, tl2.x + sz2.width); 
    int y_br = min(tl1.y + sz1.height, tl2.y + sz2.height); 
    if (x_tl < x_br && y_tl < y_br) 
    { 
     roi = Rect(x_tl, y_tl, x_br - x_tl, y_br - y_tl); 
     return true; 
    } 
    return false; 
} 

是。在OpenCV中有一個方法可以在opencv/modules/stitching/src/util.cpp中使用。