Access violation error on stereolabs - opencv

Question

I'm writing a program to convert an image sensed with a StereoLabs ZED stereocamera to an OpenCV image, to do some processing, here is the code (including the setup part een if I don't know if the problem can be there):
#include "stdafx.h"
#include "sl/camera.hpp"
#include "opencv2/opencv.hpp"
using namespace std;
using namespace cv;
using namespace sl;
cv::Mat zed_to_ocv(sl::Mat zed_mat) {
int cv_type = -1;
switch (zed_mat.getDataType()) {
case MAT_TYPE_32F_C1: cv_type = CV_32FC1; break;
case MAT_TYPE_32F_C2: cv_type = CV_32FC2; break;
case MAT_TYPE_32F_C3: cv_type = CV_32FC3; break;
case MAT_TYPE_32F_C4: cv_type = CV_32FC4; break;
case MAT_TYPE_8U_C1: cv_type = CV_8UC1; break;
case MAT_TYPE_8U_C2: cv_type = CV_8UC2; break;
case MAT_TYPE_8U_C3: cv_type = CV_8UC3; break;
case MAT_TYPE_8U_C4: cv_type = CV_8UC4; break;
default: break;
}
return cv::Mat(zed_mat.getHeight(), zed_mat.getWidth(), cv_type, zed_mat.getPtr<sl::uchar1>(MEM_CPU));
}
int main(int argc, char **argv) {
InitParameters parameters;
parameters.depth_mode = DEPTH_MODE_PERFORMANCE;
parameters.coordinate_units = UNIT_METER;
parameters.camera_fps = 30;
if (argc > 1) {
parameters.svo_input_filename = argv[1];
}
sl::Camera zed;
ERROR_CODE err = zed.open(parameters);
if (err != SUCCESS) {
zed.close();
cout << "Error while opening ZED camera";
return -1;
}
RuntimeParameters runtime_parameters;
runtime_parameters.sensing_mode = SENSING_MODE_STANDARD;
Resolution image_size = zed.getResolution();
int new_width = image_size.width;
int new_height = image_size.height;
sl::Mat image_zed(new_width, new_height, MAT_TYPE_8U_C4);
cv::Mat image_ocv = zed_to_ocv(image_zed);
cv::Mat image(new_width, new_height, CV_8UC1);
while (true) {
if (zed.grab(runtime_parameters) == SUCCESS) {
zed.retrieveImage(image_zed, VIEW_LEFT, MEM_CPU, new_width, new_height);
cv::cvtColor(image_ocv, image, CV_BGRA2GRAY);
imshow("camera", image);
waitKey(30);
}
}
zed.close();
return 0;
}
This code works just fine, but if I wanted to use 32F matrices instead (changing the type of both image_zed and image) I get a
Exception in correspondence of 0x00007FF97D175400 (opencv_imgproc340d.dll) in projectCV.exe: 0xC0000005: access violation error reading 0x000002C52DC13040.
error. I tried changing to
getPtr<sl::float1>
inside zed_to_ocv, but the error is still there.
EDIT: Debugging I found out the crash happens at line
cv::cvtColor(image_ocv, image, CV_BGRA2GRAY);
but I still can't figure out why.
What is the problem here? Thanks.