OpenCV C++ Error with sinusoidal pattern generation - structured_light library - c++

Question

I am trying to use the sinusoidal pattern tool in C++ with Visual Studio. I have placed the code that I am testing this with below. In visual studio everything looks fine bar the red squiggle under params in the following line:
Ptr<structured_light::SinusoidalPattern> sinus = structured_light::SinusoidalPattern::create(params);
When I try to build I get the following error message:
Severity Code Description Project File Line Suppression State Error (active)
no suitable user-defined conversion from
"cv::structured_light::SinusoidalPattern::Params" to
"cv::Ptr<cv::structured_light::SinusoidalPattern::Params>" exists Structured_Light_Test
c:\Users\ianco\Desktop\CPlusPlus_Programming\Structured_Light_Test\Structured_Light_Test\Main.cpp 70
I would be very grateful if anyone could offer some advice on how I could get round this issue or suggest another method.
CODE:
#include <opencv2/highgui.hpp>
#include <vector>
#include <iostream>
#include <fstream>
#include <opencv2/core.hpp>
#include <opencv2/core/utility.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/calib3d.hpp>
#include <opencv2/structured_light.hpp>
#include <opencv2/phase_unwrapping.hpp>
using namespace cv;
using namespace std;
int main(int argc, char **argv)
{
structured_light::SinusoidalPattern::Params params;
params.width = 1080;
params.height = 700;
params.nbrOfPeriods = 5;
params.setMarkers = true;
params.horizontal = false;
params.methodId = 2;
params.shiftValue = static_cast<float>(2 * CV_PI / 3);
params.nbrOfPixelsBetweenMarkers = 70;
String outputPatternPath = "C:/Users/ianco/Desktop/CPlusPlus_Programming";
String outputWrappedPhasePath = "C:/Users/ianco/Desktop/CPlusPlus_Programming";
String outputUnwrappedPhasePath = "C:/Users/ianco/Desktop/CPlusPlus_Programming";
Ptr<structured_light::SinusoidalPattern> sinus = structured_light::SinusoidalPattern::create(params);
// Storage for patterns
vector<Mat> patterns;
//Generate sinusoidal patterns
sinus->generate(patterns);
cv::Mat blue, green, red;
std::vector<cv::Mat> images(3);
// OpenCV works natively with BGR ordering
images.at(0) = patterns[0];
images.at(1) = patterns[1];
images.at(2) = patterns[2];
cv::Mat color;
cv::merge(images, color);
namedWindow("pattern", WINDOW_NORMAL);
setWindowProperty("pattern", WND_PROP_FULLSCREEN, WINDOW_FULLSCREEN);
imshow("pattern", color);
waitKey(3000);
}

Answer 1

The documentation tells you that params should also be a Ptr but you passed the object...
try using makePtr
Change this line:
structured_light::SinusoidalPattern::Params params;
with this:
Ptr<cv::structured_light::SinusoidalPattern::Params> params = makePtr< SinusoidalPattern::Params >();
you will have to change . to -> for each use of params like params.width = 1080; would be params->width = 1080;, since it will be a pointer now.
The rest of the code should be ok.