使用cvtColor转换单个颜色 [英] Convert a single color with cvtColor
问题描述
我有一种颜色,我想转换为不同的颜色空间。是否可以直接在 cv :: Vec3f
上使用 cvtColor
而不创建1x1 cv :: Mat
并使用该像素填充,使用 cv :: Mat
cvtColor >,然后得到输出中的唯一像素?
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.
有没有建议?
#include <iostream>
#include <opencv2/opencv.hpp>
int main(int, char*[])
{
cv::Vec3f hsv;
hsv[0] = .9;
hsv[1] = .8;
hsv[2] = .7;
std::cout << "HSV: " << hsv << std::endl;
cv::Vec3b bgr;
cvtColor(hsv, bgr, CV_HSV2BGR); // OpenCV Error: Assertion failed (scn == 3 && (dcn == 3 || dcn == 4) && (depth == CV_8U || depth == CV_32F)) in cvtColor
std::cout << "BGR: " << bgr << std::endl;
return EXIT_SUCCESS;
}
我也试过这个,但得到一个不同的错误:
I also tried this, but get a different error:
#include <iostream>
#include <opencv2/opencv.hpp>
int main(int, char*[])
{
cv::Mat_<cv::Vec3f> hsv(cv::Vec3f(0.7, 0.7, 0.8));
std::cout << "HSV: " << hsv << std::endl;
cv::Mat_<cv::Vec3b> bgr;
cvtColor(hsv, bgr, CV_HSV2BGR); // OpenCV Error: Assertion failed (!fixedType() || ((Mat*)obj)->type() == mtype) in create
std::cout << "BGR: " << bgr << std::endl;
return EXIT_SUCCESS;
}
推荐答案
但是你在 cvtColor
中有不同类型的源和目标,并导致错误。
Your second approach is correct, but you have source and destination of different types in cvtColor
, and that causes the error.
hsv
和 bgr
中的相同类型, CV_32F
:
Be sure to have both hsv
and bgr
of the same type, CV_32F
here:
#include <opencv2/opencv.hpp>
#include <iostream>
int main()
{
cv::Mat3f hsv(cv::Vec3f(0.7, 0.7, 0.8));
std::cout << "HSV: " << hsv << std::endl;
cv::Mat3f bgr;
cvtColor(hsv, bgr, CV_HSV2BGR);
std::cout << "BGR: " << bgr << std::endl;
return 0;
}
c $ c> Mat3f 。它只是一个typedef:
You can use Mat3f
for brevity. It's just a typedef:
typedef Mat_<Vec3f> Mat3f;
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