[高分无人机]：HSV 图片滤波 ——inRange Scalar

inRange()

//cpp
void cv::inRange	(	InputArray 	src,
InputArray 	lowerb,
InputArray 	upperb,
OutputArray 	dst 
)
//python		
dst	=cv.inRange(src, lowerb, upperb[, dst]	)

1. 参数

Parameters
src first input array.
lowerb inclusive lower boundary array or a scalar.
upperb inclusive upper boundary array or a scalar.
dst output array of the same size as src and CV_8U type.

2. 使用例子

inRange(imgHSV, Scalar(iLowH, iLowS, iLowV), Scalar(iHighH, iHighS, iHighV), imgThresholded);

两通道如下所示，三通道以此类推
$$\text{dst}(I)=\text{lowerb}(I{)}_0\le \text{src}(I{)}_0\le \text{upperb}(I{)}_0\wedge \text{lowerb}(I{)}_1\le \text{src}(I{)}_1\le \text{upperb}(I{)}_1$$

3.Scalar讲解

Scalar_<_Tp>::Scalar_(_Tp v0, _Tp v1, _Tp v2, _Tp v3)
{
    this->val[0] = v0;
    this->val[1] = v1;
    this->val[2] = v2;
    this->val[3] = v3;
}

它将各个通道的值构成一个整体，赋给具有相同通道数的矩阵元素