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

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OpenCV中cvAdds和cvAdd中的mask的用法探讨

OpenCV中cvAdds和cvAdd中的mask的用法探讨

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