OpenCV中cvAdds和cvAdd中的mask的用法探讨

末蓝、 2022-06-08 09:54 206阅读 0赞

# OpenCV中cvAdds和cvAdd中的mask的用法探讨 #

**Fn :**

> **包含 mask 参数的一些函数如下 **\[摘自opencv 2.3.1版本 C++\]
> 
>  *  void **add**(InputArray **src1**, InputArray **src2**, OutputArray **dst**, InputArray **mask**=noArray(), int **dtype**=-1)
>  *  subtract
>  *  bitwise\_and, bitwise\_not, bitwise\_or, bitwise\_xor
>  *  mean, menStdDev
>  *  minMaxLoc
>  *  norm, normalize
>  *  grabCut
>  *  calcHist
>  *  …

**Quote :**

> **mask –** Optional operation mask, 8-bit single channel array, that specifies elements of the destination array to be changed. \[**From** OpenCV2.3.1 Doc\]
> 
> mask 是一个8位的单通道数组，它指定了目标数组哪些元素会被修改。以 add 函数为例，请见 **Code**

--------------------

**Code :**

>     1: /*
> 
>     2:     Author : Ggicci
> 
>     3:     Date   : 2012.07.20
> 
>     4:     Title  : How to use opencv's parameter - mask ?
> 
>     5: */
> 
>     6: int main()
> 
>     7: {
> 
>     8:     Mat m(10, 10, CV_8U);
> 
>     9:     //RNG类对象rng, 以统一分布(Uniform Distribution)随机填充矩阵 m 和 n
> 
>     10:     cv::RNG rng;
> 
>     11:     rng.fill(m, RNG::UNIFORM, 0, 10);
> 
>     12:     cout << "m = " << endl << m << endl << endl;
> 
>     13:
> 
>     14:     Mat n(10, 10, CV_8U);
> 
>     15:     rng.fill(n, RNG::UNIFORM, 8, 10);
> 
>     16:     cout << "n = " << endl << n << endl << endl;
> 
>     17:
> 
>     18:     Mat dst;
> 
>     19:     //指定 mask
> 
>     20:     Mat mask(10, 10, CV_8U, Scalar(0));
> 
>     21:     Mat specified(mask, Rect(2, 5, 4, 4));
> 
>     22:     specified.setTo(1);
> 
>     23:     cout << "mask = " << endl << mask << endl << endl;
> 
>     24:
> 
>     25:     cv::add(m, n, dst, mask);
> 
>     26:     cout << "dst = " << endl << dst << endl << endl;
> 
>     27:
> 
>     28:     return 0;
> 
>     29: }

**Output :**

>     1: m =
> 
>     2: [6, 7, 9, 9, 7, 0, 6, 3, 6, 9;
> 
>     3:   1, 8, 7, 8, 5, 3, 8, 1, 7, 3;
> 
>     4:   3, 3, 5, 4, 8, 2, 6, 1, 2, 2;
> 
>     5:   6, 1, 0, 7, 3, 5, 0, 6, 3, 3;
> 
>     6:   7, 5, 0, 5, 3, 0, 2, 7, 1, 7;
> 
>     7:   9, 8, 8, 3, 9, 5, 4, 1, 8, 3;
> 
>     8:   8, 1, 8, 7, 7, 0, 3, 8, 8, 3;
> 
>     9:   8, 9, 5, 1, 1, 3, 3, 3, 4, 7;
> 
>     10:   2, 7, 6, 8, 2, 4, 9, 5, 6, 1;
> 
>     11:   5, 0, 5, 7, 8, 4, 1, 0, 4, 8]
> 
>     12:
> 
>     13: n =
> 
>     14: [9, 8, 9, 8, 8, 9, 9, 9, 9, 9;
> 
>     15:   9, 9, 9, 9, 9, 8, 8, 9, 9, 9;
> 
>     16:   8, 8, 9, 9, 8, 9, 9, 9, 8, 9;
> 
>     17:   9, 9, 8, 9, 9, 8, 8, 8, 8, 8;
> 
>     18:   8, 8, 9, 8, 9, 9, 8, 8, 8, 8;
> 
>     19:   9, 9, 9, 9, 8, 8, 8, 9, 9, 8;
> 
>     20:   9, 9, 8, 8, 8, 9, 9, 8, 8, 9;
> 
>     21:   9, 8, 9, 9, 8, 9, 8, 9, 9, 8;
> 
>     22:   9, 8, 9, 9, 9, 9, 8, 9, 8, 8;
> 
>     23:   8, 8, 9, 9, 9, 8, 9, 8, 9, 9]
> 
>     24:
> 
>     25: mask =
> 
>     26: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
> 
>     27:   0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
> 
>     28:   0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
> 
>     29:   0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
> 
>     30:   0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
> 
>     31:   0, 0, 1, 1, 1, 1, 0, 0, 0, 0;
> 
>     32:   0, 0, 1, 1, 1, 1, 0, 0, 0, 0;
> 
>     33:   0, 0, 1, 1, 1, 1, 0, 0, 0, 0;
> 
>     34:   0, 0, 1, 1, 1, 1, 0, 0, 0, 0;
> 
>     35:   0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
> 
>     36:
> 
>     37: dst =
> 
>     38: [205, 205, 205, 205, 205, 205, 205, 205, 205, 205;
> 
>     39:   205, 205, 205, 205, 205, 205, 205, 205, 205, 205;
> 
>     40:   205, 205, 205, 205, 205, 205, 205, 205, 205, 205;
> 
>     41:   205, 205, 205, 205, 205, 205, 205, 205, 205, 205;
> 
>     42:   205, 205, 205, 205, 205, 205, 205, 205, 205, 205;
> 
>     43:   205, 205, 17, 12, 17, 13, 205, 205, 205, 205;
> 
>     44:   205, 205, 16, 15, 15, 9, 205, 205, 205, 205;
> 
>     45:   205, 205, 14, 10, 9, 12, 205, 205, 205, 205;
> 
>     46:   205, 205, 15, 17, 11, 13, 205, 205, 205, 205;
> 
>     47:   205, 205, 205, 205, 205, 205, 205, 205, 205, 205]
> 
>     48:
> 
>     49: 请按任意键继续. . .//mask的红色部分指定了dst被修改的部分(同样以红色标出)，其余部分为dst的初始化值
> 
>