【opencv基础】Rect类的神奇用法

前言

最近看github上源码发现对两个cv::Rect使用相与(&)操作，猛地感觉自己蒙啦，Rect类还有这种神奇用法？！翻看opencv官网Rect类，果然如此！

opencv中Rect类

Rect_类有些意思，成员变量x、y、width、height，分别为左上角点的坐标和矩形的宽和高。常用的成员函数有Size()返回值为一个Size，area()返回矩形的面积，contains(Point)用来判断点是否在矩形内，inside(Rect)函数判断矩形是否在该矩形内，tl()返回左上角点坐标，br()返回右下角点坐标。

Rect类的使用

• rect = rect ± point (shifting a rectangle by a certain offset)
• rect = rect ± size (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 rect1 and rect2 )
• rect &= rect1, rect |= rect1 (and the corresponding augmenting operations)
• rect == rect1, rect != rect1 (rectangle comparison)

两个矩形的交并

Rect rect = rect1 & rect2;    
Rect rect = rect1 | rect2;  

两个矩形的平移或者缩放

Rect rectShift = rect + point;  
Rect rectScale = rect + size;  

参考

1.opencv官网Rect类；

2.opencv中的Rect类；

2.opencv中Rect类用法；

3.opencv中Rect类的神奇用法；

完