Assertion failed error in opencv code - c++

Question

I am trying to compute HSV histogram of frames of a Histogram . My code gives Assertion failed error. Error is in function hsv_histogram. If i do it for 2 dimensional histogram it works perfectly for me but when i add third dimension value it gives me assertion failed error.
// newproject.cpp : Defines the entry point for the console application.
#include "stdafx.h"
#include "highgui.h"
#include <stdio.h>
#include <cv.h>
#include <highgui.h>
#include <stdio.h>
#include <conio.h>
#include <opencv2/imgproc/imgproc.hpp> // Gaussian Blur
#include <opencv2/core/core.hpp> // Basic OpenCV structures (cv::Mat, Scalar)
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
#include <conio.h>
using namespace cv;
using namespace std;
class frameprocessing{
Mat hsv_base;
Mat hist_base;
public:
void hsv_histogram(Mat Frame)
{
cvtColor( Frame, hsv_base, CV_BGR2HSV );
int h_bins = 50;
int s_bins = 32;
int v_bins = 10;
int histSize[] = { h_bins, s_bins };
float h_ranges[] = { 0, 256 };
float s_ranges[] = { 0, 180 };
float v_ranges[] = { 0, 256 };
const float* ranges[] = { h_ranges, s_ranges ,v_ranges};
int channels[] = { 0, 1 ,2};
calcHist( &hsv_base, 1, channels, Mat(), hist_base, 3, histSize, ranges, true, false );
}
};
class video{
Mat frame;
string filename;
double dWidth;
double dHeight;
public:
video()
{
}
video(string videoname)
{
vector<Mat> videoframes;
filename = videoname;
VideoCapture capture(filename);
if( !capture.isOpened() )
{
exit(0);
}
dWidth = capture.get(CV_CAP_PROP_FRAME_WIDTH); //get the width of frames of the video
dHeight = capture.get(CV_CAP_PROP_FRAME_HEIGHT); //get the height of frames of the video
frameprocessing obj;
for( ; ; )
{
capture >> frame;
if(frame.empty())
break;
// Mat tmp=frame.clone();
obj.hsv_histogram(frame);
// videoframes.push_back(tmp);
}
//displayvideo(videoframes);
//writer(videoframes);
}
};
int _tmain(int argc, _TCHAR* argv[])
{
video obj("video.avi");
}

Answer 1

May be you forgot to set v hist size?
I suppose that
int histSize[] = { h_bins, s_bins };
should be something like
int histSize[] = { h_bins, s_bins, v_bins };