Convert a single color with cvtColor

问题:

I have a color that I want to convert to a different color space. Is it possible to use cvtColor on a cv::Vec3f directly without creating a 1x1 cv::Mat and populating it with that pixel, using cvtColor on the cv::Mat, then getting the only pixel out of the output? I have tried the following, but it doesn't seem to like getting passed a vector.

Any suggestions?

#include   #include   int main(int, char*[]) {     cv::Vec3f hsv;     hsv[0] = .9;     hsv[1] = .8;     hsv[2] = .7;      std::cout 

I also tried this, but get a different error:

#include   #include   int main(int, char*[]) {     cv::Mat_<:vec3f> hsv(cv::Vec3f(0.7, 0.7, 0.8));      std::cout  bgr;      cvtColor(hsv, bgr, CV_HSV2BGR); // OpenCV Error: Assertion failed (!fixedType() || ((Mat*)obj)->type() == mtype) in create      std::cout 

回答1:

Your second approach is correct, but you have source and destination of different types in cvtColor, and that causes the error.

Be sure to have both hsv and bgr of the same type, CV_32F here:

#include  #include   int main() {     cv::Mat3f hsv(cv::Vec3f(0.7, 0.7, 0.8));      std::cout 

---

You can use Mat3f for brevity. It's just a typedef:

typedef Mat_ Mat3f; 

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