[英]opencv threshold or not equal operator
my matlab code is 我的matlab代码是
imTemp(imTemp ~= maxInd) = 0;
where imTemp is 100x100 double matrix and maxInd == 1 其中imTemp是100x100双矩阵且maxInd == 1
I thought about using cv::threshold http://docs.opencv.org/doc/tutorials/imgproc/threshold/threshold.html 我考虑过使用cv :: threshold http://docs.opencv.org/doc/tutorials/imgproc/threshold/threshold.html
but this doesn't really helps me. 但这并不能真正帮助我。
it is only if src(x,y)>thresh.... do something 只有当src(x,y)> thresh ....做点什么
can you think of another openCV function which can implement this logic? 您能想到另一个可以实现此逻辑的openCV函数吗?
You can try compare
, which can check for equality between a matrix and a scalar (or another matrix) using CMP_EQ
. 您可以尝试
compare
,它可以使用CMP_EQ
检查矩阵和标量(或另一个矩阵)之间的CMP_EQ
。
Unfortunately, compare
has the annoying feature that values that satisfy the comparison operator are set to 255 rather than 1 or the original value, so you have to divide to get the Matlab behavior. 不幸的是,
compare
具有令人讨厌的功能,即满足比较运算符的值设置为255而不是1或原始值,因此必须进行除法以获得Matlab行为。
Mat imTemp = (Mat_<double>(3,3) << 9,7,4,4,9,6,2,0,1);
double maxInd = 9;
cout << "imTemp Original:" << endl;
cout << imTemp << endl;
compare(imTemp, Scalar(maxInd), imTemp, CMP_EQ);
imTemp = imTemp*maxInd/255;
cout << "imTemp Compared:" << endl;
cout << imTemp << endl;
Output: 输出:
imTemp Original:
[9, 7, 4;
4, 9, 6;
2, 0, 1]
imTemp Compared:
[9, 0, 0;
0, 9, 0;
0, 0, 0]
You can also use the comparison operator directly to get the same results (with the same 255 behavior): 您还可以直接使用比较运算符来获得相同的结果(具有相同的255行为):
Mat imTemp = (imTemp == maxInd)*maxInd/255;
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