XcodeでOpenCVを使用する環境が構築できずに困っています

xcodeでのランタイムエラーについて

XcodeでOpenCVを利用する環境構築をしたいのですが、サンプルコードのランタイムに

Thread 1: signal SIGABRT

と表示され、下のdebug areaには

dyld: Library not loaded: /usr/local/opt/opencv/lib/libopencv_dnn_objdetect.4.2.dylib
  Referenced from: /Users/ユーザー名/Library/Developer/Xcode/DerivedData/プロジェクト名-dfthuwrjzogjbudldyhvgyjjasek/Build/Products/Debug/プロジェクト名
  Reason: no suitable image found.  Did find:
	/usr/local/opt/opencv/lib/libopencv_dnn_objdetect.4.2.dylib: code signature in (/usr/local/opt/opencv/lib/libopencv_dnn_objdetect.4.2.dylib) not valid for use in process using Library Validation: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed.
	/usr/local/lib/libopencv_dnn_objdetect.4.2.dylib: code signature in (/usr/local/lib/libopencv_dnn_objdetect.4.2.dylib) not valid for use in process using Library Validation: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed.
	/usr/local/Cellar/opencv/4.2.0_1/lib/libopencv_dnn_objdetect.4.2.0.dylib: code signature in (/usr/local/Cellar/opencv/4.2.0_1/lib/libopencv_dnn_objdetect.4.2.0.dylib) not valid for use in process using Library Validation: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed.
(lldb)

と表示されます

debug navigatorには

▼Thread 1

該当のサンプルコード

C++
1#include <opencv2/opencv.hpp>
2#include <iostream>
3
4using namespace cv;
5
6int main(){
7cv::Mat imMat(256,256, CV_8UC3);
8
9for(int y = 0 ; y < imMat.rows; y++){
10for(
11int x = 0 ; x < imMat.cols; x++){
12cv::Vec3b &p = imMat.at<cv::Vec3b>( y, x);
13p[0] = x;
14p[1] = y;
15p[2] = (int)((x+y)/2);
16}
17}
18
19imshow("openCVTest", imMat);
20cv:waitKey();
21return 0;