`#include <iostream>

include <ctime>

include <cstdlib>

include <fstream>

include <sstream>

include "raspicam_cv.h"

//#include "opencv2/imgcodecs.hpp"

include "opencv2/highgui/highgui.hpp"

include "opencv2/imgproc/imgproc.hpp"

//#include "opencv2/opencv.hpp" //editted

include <stdio.h>

include <string.h>

include <errno.h>

include <wiringserial.h>

include <wiringpi.h>

#include <iostream>
#include <ctime>
#include <cstdlib>
#include <fstream>
#include <sstream>
#include "raspicam_cv.h"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <wiringSerial.h> 
#include <wiringPi.h>
 using namespace cv;
using namespace std;
bool doTestSpeedOnly=false;
//parse command line
//returns the index of a command line param in argv. If not found, return -1
 int findParam ( string param,int argc,char **argv ) {
 int idx=-1;
 for ( int i=0; i<argc &amp;&amp;="" idx="=-1;" i++="" )="" if="" (="" string="" (="" argv[i]="" )="=param" )="" idx="i;" return="" idx;<="" p="">

}
&& idx==-1; i++ )
    if ( string ( argv[i] ) ==param ) idx=i;
return idx;

}
 //parse command line
 //returns the value of a command line param. If not found, defvalue is returned
 float getParamVal ( string param,int argc,char **argv,float defvalue=-1 ) {
 int idx=-1;
 for ( int i=0; i<argc &amp;&amp;="" idx="=-1;" i++="" )="" if="" (="" string="" (="" argv[i]="" )="=param" )="" idx="i;" if="" (="" idx="=-1" )="" return="" defvalue;="" else="" return="" atof="" (="" argv[="" idx+1]="" );="" }<="" p="">

&& idx==-1; i++ )
    if ( string ( argv[i] ) ==param ) idx=i;
if ( idx==-1 ) return defvalue;
else return atof ( argv[  idx+1] );
}

void processCommandLine ( int argc,char **argv,raspicam::RaspiCam_Cv &Camera ) {
 Camera.set ( CV_CAP_PROP_FRAME_WIDTH,  getParamVal ( "-w",argc,argv,192 ) );
 Camera.set ( CV_CAP_PROP_FRAME_HEIGHT, getParamVal ( "-h",argc,argv,144 ) );
 Camera.set ( CV_CAP_PROP_BRIGHTNESS,getParamVal ( "-br",argc,argv,50 ) );
 Camera.set ( CV_CAP_PROP_CONTRAST ,getParamVal ( "-co",argc,argv,50 ) );
 Camera.set ( CV_CAP_PROP_SATURATION, getParamVal ( "-sa",argc,argv,50 ) );
 Camera.set ( CV_CAP_PROP_GAIN, getParamVal ( "-g",argc,argv ,50 ) );
 if ( findParam ( "-gr",argc,argv ) !=-1 )
     Camera.set ( CV_CAP_PROP_FORMAT, CV_8UC1 );
 if ( findParam ( "-test_speed",argc,argv ) !=-1 )
     doTestSpeedOnly=true;
 if ( findParam ( "-ss",argc,argv ) !=-1 )
     Camera.set ( CV_CAP_PROP_EXPOSURE, getParamVal ( "-ss",argc,argv )  );
 if ( findParam ( "-wb_r",argc,argv ) !=-1 )
     Camera.set ( CV_CAP_PROP_WHITE_BALANCE_RED_V,getParamVal ( "-wb_r",argc,argv )     );
 if ( findParam ( "-wb_b",argc,argv ) !=-1 )
     Camera.set ( CV_CAP_PROP_WHITE_BALANCE_BLUE_U,getParamVal ( "-wb_b",argc,argv )     );
 
//     Camera.setSharpness ( getParamVal ( "-sh",argc,argv,0 ) );
//     if ( findParam ( "-vs",argc,argv ) !=-1 )
//         Camera.setVideoStabilization ( true );
//     Camera.setExposureCompensation ( getParamVal ( "-ev",argc,argv ,0 ) );
 
}
 





  }

 void showUsage() {
 cout<<"Usage: "<<endl; cout&lt;&lt;"[-gr="" set="" gray="" color="" capture]\n";="" cout&lt;&lt;"[-test_speed="" use="" for="" test="" speed="" and="" no="" images="" will="" be="" saved]\n";="" cout&lt;&lt;"[-w="" width]="" [-h="" height]="" \n[-br="" brightness_val(0,100)]\n";="" cout&lt;&lt;"[-co="" contrast_val="" (0="" to="" 100)]\n[-sa="" saturation_val="" (0="" to="" 100)]";="" cout&lt;&lt;"[-g="" gain_val="" (0="" to="" 100)]\n";="" cout&lt;&lt;"[-ss="" shutter_speed="" (0="" to="" 100)="" 0="" auto]\n";="" cout&lt;&lt;"[-wb_r="" val="" (0="" to="" 100),0="" auto:="" white="" balance="" red="" component]\n";="" cout&lt;&lt;"[-wb_b="" val="" (0="" to="" 100),0="" auto:="" white="" balance="" blue="" component]\n";<="" p="">

"<<endl;
cout<<"[-gr set gray color capture]\n";
cout<<"[-test_speed use for test speed and no images will be saved]\n";
cout<<"[-w width] [-h height] \n[-br brightness_val(0,100)]\n";
cout<<"[-co contrast_val (0 to 100)]\n[-sa saturation_val (0 to 100)]";
cout<<"[-g gain_val  (0 to 100)]\n";
cout<<"[-ss shutter_speed (0 to 100) 0 auto]\n";
cout<<"[-wb_r val  (0 to 100),0 auto: white balance red component]\n";
cout<<"[-wb_b val  (0 to 100),0 auto: white balance blue component]\n";

cout<<endl;
 
}
 
   }



    int main ( int argc,char **argv ) {
 int fd;
 int a;
 int b;
 if ((fd = serialOpen("/dev/ttyAMA0", 9600)) < 0)
 {
     fprintf(stderr, "unable to open serial device; %s\n", strerror(errno));
     return 1;
    }
    }
if ( argc==1 ) {
     cerr<<"Usage (-help for help)"<<endl; }="" if="" (="" findparam="" (="" "-help",argc,argv="" )="" !="-1" )="" {="" showusage();="" return="" -1;="" }="" raspicam::raspicam_cv="" camera;="" camera.set(cv_cap_prop_fps,="" 30);="" processcommandline(argc,="" argv,="" camera);="" cout="" &lt;&lt;="" "connecting="" to="" camera"="" &lt;&lt;="" endl;="" if="" (!camera.open())="" {="" cerr="" &lt;&lt;="" "error="" opening="" camera"="" &lt;&lt;="" endl;="" return="" -1;="" }="" cout="" &lt;&lt;="" "connected="" to="" camera=" &lt;&lt; help)"<<endl;
}
if ( findParam ( "-help",argc,argv ) !=-1 ) {
    showUsage();
    return -1;
}
raspicam::RaspiCam_Cv Camera;
Camera.set(CV_CAP_PROP_FPS, 30);
processCommandLine(argc, argv, Camera);
cout << "Connecting to camera" << endl;
if (!Camera.open()) {
    cerr << "Error opening camera" << endl;
    return -1;
}
cout << "Connected to camera =" << Camera.getId() &lt;&lt; endl;&lt;/p&gt;

&lt;pre&gt;&lt;code&gt;cv::Mat << endl;

cv::Mat image;
vector&lt;Mat&gt; vector<Mat> Concat;
//int nCount = 70;
cout &lt;&lt; " capturing"="" &lt;&lt;="" endl;="" for="" (int="" i="0;" i="" &lt;="3;" i++){="" camera.grab();="" camera.retrieve(image);="" concat.push_back(image.clone());="" cv::imwrite("image"+std::to_string(i)+".jpg",image);="" delay(150);="" }="" mat="" src_base,="" hsv_base;="" mat="" src_test1,="" hsv_test1;="" mat="" src_test2,="" hsv_test2;="" mat="" hsv_half_down;="" load="" three="" images="" with="" different="" environment="" settings="" if="" (argc="" &lt;="" 4)="" {="" printf("**="" error.="" usage:="" .="" comparehist_demo="" &lt;image_settings0&gt;="" &lt;image_setting1&gt;="" &lt;image_settings2&gt;\n");="" return="" -1;="" }="" src_base="imread("image0"," 1);="" src_test1="imread("image1"," 1);="" src_test2="imread("image2"," 1);="" convert="" to="" hsv="" cvtcolor(src_base,="" hsv_base,="" color_bgr2hsv);="" cvtcolor(src_test1,="" hsv_test1,="" color_bgr2hsv);="" cvtcolor(src_test2,="" hsv_test2,="" color_bgr2hsv);="" hsv_half_down="hsv_base(Range(hsv_base.rows" 2,="" hsv_base.rows="" -="" 1),="" range(0,="" hsv_base.cols="" -="" 1));="" using="" 50="" bins="" for="" hue="" and="" 60="" for="" saturation="" int="" h_bins="50;" int="" s_bins="60;" int="" histsize[]="{" h_bins,="" s_bins="" };="" hue="" varies="" from="" 0="" to="" 179,="" saturation="" from="" 0="" to="" 255="" float="" h_ranges[]="{" 0,="" 180="" };="" float="" s_ranges[]="{" 0,="" 256="" };="" const="" float*="" ranges[]="{" h_ranges,="" s_ranges="" };="" use="" the="" o-th="" and="" 1-st="" channels="" int="" channels[]="{" 0,="" 1="" };="" histograms="" matnd="" hist_base;="" matnd="" hist_half_down;="" matnd="" hist_test1;="" matnd="" hist_test2;="" calculate="" the="" histograms="" for="" the="" hsv="" images="" calchist(&amp;hsv_base,="" 1,="" channels,="" mat(),="" hist_base,="" 2,="" histsize,="" ranges,="" true,="" false);="" normalize(hist_base,="" hist_base,="" 0,="" 1,="" norm_minmax,="" -1,="" mat());="" calchist(&amp;hsv_half_down,="" 1,="" channels,="" mat(),="" hist_half_down,="" 2,="" histsize,="" ranges,="" true,="" false);="" normalize(hist_half_down,="" hist_half_down,="" 0,="" 1,="" norm_minmax,="" -1,="" mat());="" calchist(&amp;hsv_test1,="" 1,="" channels,="" mat(),="" hist_test1,="" 2,="" histsize,="" ranges,="" true,="" false);="" normalize(hist_test1,="" hist_test1,="" 0,="" 1,="" norm_minmax,="" -1,="" mat());="" calchist(&amp;hsv_test2,="" 1,="" channels,="" mat(),="" hist_test2,="" 2,="" histsize,="" ranges,="" true,="" false);="" normalize(hist_test2,="" hist_test2,="" 0,="" 1,="" norm_minmax,="" -1,="" mat());="" apply="" the="" histogram="" comparison="" methods="" for="" (int="" i="0;" i="" &lt;="" 4;="" i++)="" {="" int="" compare_method="i;" double="" base_base="compareHist(hist_base," hist_base,="" compare_method);="" double="" base_half="compareHist(hist_base," hist_half_down,="" compare_method);="" double="" base_test1="compareHist(hist_base," hist_test1,="" compare_method);="" double="" base_test2="compareHist(hist_base," hist_test2,="" compare_method);="" printf("="" method="" [%d]="" perfect,="" base-half,="" base-test(1),="" base-test(2)="" :="" %f,="" %f,="" %f,="" %f="" \n",="" i,="" base_base,="" base_half,="" base_test1,="" base_test2);="" }="" printf("done="" \n");="" camera.release();="" <="" code="">

}`<< "Capturing" << endl;
for (int i = 0; i <= 3; i++){
    Camera.grab();
    Camera.retrieve(image);
    Concat.push_back(image.clone());
    cv::imwrite("image"+std::to_string(i)+".jpg",image);
    //delay(150);
}
Mat src_base, hsv_base;
Mat src_test1, hsv_test1;
Mat src_test2, hsv_test2;
Mat hsv_half_down;

/// Load three images with different environment settings
if (argc < 4)
{
    printf("** Error. Usage: ./compareHist_Demo <image_settings0> <image_setting1> <image_settings2>\n");
    return -1;
}

src_base = imread("image0", 1);
src_test1 = imread("image1", 1);
src_test2 = imread("image2", 1);

/// Convert to HSV
cvtColor(src_base, hsv_base, COLOR_BGR2HSV);
cvtColor(src_test1, hsv_test1, COLOR_BGR2HSV);
cvtColor(src_test2, hsv_test2, COLOR_BGR2HSV);

hsv_half_down = hsv_base(Range(hsv_base.rows / 2, hsv_base.rows - 1), Range(0, hsv_base.cols - 1));

/// Using 50 bins for hue and 60 for saturation
int h_bins = 50; int s_bins = 60;
int histSize[] = { h_bins, s_bins };

// hue varies from 0 to 179, saturation from 0 to 255
float h_ranges[] = { 0, 180 };
float s_ranges[] = { 0, 256 };

const float* ranges[] = { h_ranges, s_ranges };

// Use the o-th and 1-st channels
int channels[] = { 0, 1 };


/// Histograms
MatND hist_base;
MatND hist_half_down;
MatND hist_test1;
MatND hist_test2;

/// Calculate the histograms for the HSV images
calcHist(&hsv_base, 1, channels, Mat(), hist_base, 2, histSize, ranges, true, false);
normalize(hist_base, hist_base, 0, 1, NORM_MINMAX, -1, Mat());

calcHist(&hsv_half_down, 1, channels, Mat(), hist_half_down, 2, histSize, ranges, true, false);
normalize(hist_half_down, hist_half_down, 0, 1, NORM_MINMAX, -1, Mat());

calcHist(&hsv_test1, 1, channels, Mat(), hist_test1, 2, histSize, ranges, true, false);
normalize(hist_test1, hist_test1, 0, 1, NORM_MINMAX, -1, Mat());

calcHist(&hsv_test2, 1, channels, Mat(), hist_test2, 2, histSize, ranges, true, false);
normalize(hist_test2, hist_test2, 0, 1, NORM_MINMAX, -1, Mat());

/// Apply the histogram comparison methods
for (int i = 0; i < 4; i++)
{
    int compare_method = i;
    double base_base = compareHist(hist_base, hist_base, compare_method);
    double base_half = compareHist(hist_base, hist_half_down, compare_method);
    double base_test1 = compareHist(hist_base, hist_test1, compare_method);
    double base_test2 = compareHist(hist_base, hist_test2, compare_method);

    printf(" Method [%d] Perfect, Base-Half, Base-Test(1), Base-Test(2) : %f, %f, %f, %f \n", i, base_base, base_half, base_test1, base_test2);
}

printf("Done \n");
Camera.release();

   }

I use the raspberry pi to take images and then compare them. But when I run this code, the camera take pictures, but it gave this error information `OpenCV information

OpenCV Error: Assertion failed ((scn == 3 || scn == 4) && (depth == CV_8U || depth == CV_32F)) in cvtColor, file /usr/src/packages/BUILD/opencv-2.4.1+dfsg/modules/imgproc/src/color.cpp, line 3344
 terminate called after throwing an instance of 'cv::Exception'
   what():  /usr/src/packages/BUILD/opencv-2.4.1+dfsg/modules/imgproc/src/color.cpp:3344: error:  (-215)  (scn == 3 || scn == 4) && (depth == CV_8U || depth == CV_32F) in function cvtColorcvtColor

Aborted

Aborted` Could anyone help me with this? In addition, my opencv version is 2.4.1