CODEWITHSUNDEEP
opencvcomputer-vision
user_3849
user_3849

Reputation: 106

Access element of Point3f

I have a Point3f and I want to normalize it, e.g. divide with the last (z) element.

Point3f C_tmp;

I can print it out like this,

cout << "C_tmp= " << C_tmp << endl;

But, I cannot just do 

C_tmp=C_tmp/C_tmp[3];

I use C++ interface. I couldn't find something helpful in the documentation. Any idea?

EDIT: Vector case:

int i;
    for (i=begin; i<end; i++) {
    threeD=...[i]..;
    threeDVector.push_back(threeD);
    twoD.x= threeD.x / threeD.z;
    twoD.y= threeD.y / threeD.z;
    twoDVector.push_back(twoD);
}

Upvotes: 1

Views: 5168

Answers (1)

tofi9
tofi9

Reputation: 5853

Point3f has the fields x, y, and z:

Point3f threeD(2, 3, 4);
Point2f twoD(threeD.x / threeD.z, threeD.y / threeD.z);

You can also (implicitly) convert a Point3f to a Vec3f and do the trick your way (be away, c++ uses 0-based array):

...
Vec3f threeDVector = threeD;
threeDVector /= threeDVector[2];

Last, I think the best way to explore the functionality of such structures is simply just to read the opencv header files (in this case opencv2/core/types.hpp)

Upvotes: 4

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