访问冲突写入位置0x00000000 [英] Access violation writing location 0x00000000

问题描述

请查看以下代码

ColorDetector.h

#pragma 
#include <iostream>
#include <opencv2\core\core.hpp>
#include <opencv2\highgui\highgui.hpp>

using namespace std;
using namespace cv;

class ColorDetector
{
public:
    ColorDetector(void);
    ~ColorDetector(void);

    //Set the Color Distance
    void SetColorDistanceThreshold(int);

    //Get the Color distance
    int GetColorDistanceThreshold();

    //Detect Colours of the image
    Mat Process(Mat &image);

    //Set the Target color using 3 channels
    void SetTargetColor(unsigned char red, unsigned char green, unsigned char blue);

    //Set the Target color using Vec3b
    //This will hold the whole color value at once
    void SetTargetColor(Vec3b color);

    //Returns the target color
    Vec3b GetTargetColor();

    //Gets the distancefrom the target color
    int GetDistance(const Vec3b &)const;

private:
    int minDist; //Minimum acceptable distance
    Mat result; //The resulting image
    Vec3b target; //The target colour
};

ColorDetector.cpp

#include "ColorDetector.h"


ColorDetector::ColorDetector(void)
{
    //Set the RGB Values
    target[0] = 0;
    target[1] = 0;
    target[2] = 0;
}


ColorDetector::~ColorDetector(void)
{
}

void ColorDetector::SetColorDistanceThreshold(int distance)
{
    if(distance>0)
    {
        minDist = distance;
    }
    else
    {
        minDist = 0;
    }
}

int ColorDetector::GetColorDistanceThreshold()
{
    return minDist;
}

void ColorDetector::SetTargetColor(unsigned char red, unsigned char green, unsigned char blue)
{
    //BGR Order
    target[0] = blue;
    target[1] = green;
    target[2] = red;
}

void ColorDetector::SetTargetColor(Vec3b color)
{
    target = color;
}

Vec3b ColorDetector::GetTargetColor()
{
    return target;
}

int ColorDetector::GetDistance(const Vec3b &color)const
{
    int distance = abs(color[0]-target[0]) +
                   abs(color[1]-target[1]) +
                   abs(color[2]-target[2]);

    return distance;

}

Mat ColorDetector::Process(Mat &image)
{
    result.create(result.rows,result.cols,CV_8U);

    //Loop
    Mat_<Vec3b>::const_iterator it = image.begin<Vec3b>();
    Mat_<Vec3b>::const_iterator itend = image.end<Vec3b>();

    Mat_<uchar>::iterator itout = result.begin<uchar>();

    while( it != itend)
    {


        //Compute distance from target color
        if(GetDistance(*it)<minDist)
        {
            *itout = 255;
        }
        else
        {
            *itout = 0;
        }

        *++it;
        *++itout;
    }

    return result;
}

ColorDetectorMain.cpp

#include <iostream>
#include <opencv2\core\core.hpp>
#include <opencv2\highgui\highgui.hpp>
#include "ColorDetector.h"

using namespace std;

    int main()
    {
        ColorDetector cd;

        Mat image = imread("C:/Users/Public/Pictures/Sample Pictures/Tulips.jpg");

        try
        {
            if(!image.data)
            {
                throw 1;
            }
        }
        catch(int i)
        {
            cout << "Unable to read the image" << endl;
        }

        cd.SetColorDistanceThreshold(100);
        cd.SetTargetColor(130,190,230);

        namedWindow("Result");
        imshow("Result",cd.Process(image));

        waitKey(0);
    }

运行此代码时出现以下错误

I get the following error when I run this code

First-chance exception at 0x013a16a5 in OpenCv.exe: 0xC0000005: Access violation writing location 0x00000000.
Unhandled exception at 0x013a16a5 in OpenCv.exe: 0xC0000005: Access violation writing location 0x00000000.
The program '[4768] OpenCv.exe: Native' has exited with code -1073741819 (0xc0000005).

此处代码中断 * itout = 255; 在内部，而在ColorDetector.cpp循环中。

The code breaks here *itout = 255; which in inside the while loop of ColorDetector.cpp.

我在这做错了什么？请帮助！

What am I doing here wrong? Please help!

推荐答案

您收到此错误，因为结果小于 image 并且在某些时候到达 result.end（），然后到达 image.end（ ）。

You get this error because result is smaller than image and at some point you reach result.end() before reaching image.end().

    result.create(result.rows,result.cols,CV_8U);

您的意思是？

    result.create(image.rows,image.cols,CV_8U);

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