I want to create a Scalar which has a variable(integer) number of channels, hopefully all the channels being 0.
int channels = 2;
cv::Scalar(...); //Create Scalar with "channels" number of channels, all with the value of 0
cv::Scalar can store a maximum of 4 channels, each containing a double-precision floating point value.
https://github.com/opencv/opencv/blob...
It does not remember how many channels it was initialized with. It will always be 4 channels.
A default-constructed Scalar is already initialized with all-zeroes. This is because it has a user-defined constructor that does not require any arguments, and its body does exactly what you'd expect. Code:
Asked: 2018-03-28 15:41:57 -0600
Seen: 645 times
Last updated: Mar 29 '18
Did you try all()?
From what I've tested myself, it returns a 4 channel scalar with all elements set to a given value (which I would set to 0)