Question

我目前正在编写BLOB检测算法。当我运行它时，我收到错误

blobdetector.exe中0x00007FF70476CDA7处的未处理异常：0xC0000005：

访问冲突读取位置0x0000007BDDA0347D。

这是代码中断的部分。

调试器在if(val == 255)

之前的最后一行停止

void connectivity(BlobBurnMat temp, size_t y, size_t x){
    uchar* ptr = (uchar*)temp.getTemp().data;
    size_t min_y = temp.getTemp().rows, min_x = temp.getTemp().cols, max_y = 0, max_x = 0;

    for (int i = 0; i < 4; i++){
        int kernel[4][2] = { { 0, 1 }, { 1, 0 }, { 0, -1 }, { -1, 0 } };
        int temp_y = y + kernel[i][0];
        int temp_x = x + kernel[i][1];
        uchar val = ptr[temp.getTemp().step * temp_y + temp_x];  //breaks here

        if (val == 255) {
            temp.setValZero(x, y);
            x = temp_x;
            y = temp_y;

            if (temp_x > max_x) 
                max_x = temp_x;
            if(temp_x < min_x) 
                min_x = temp_x;
            if (temp_y > max_y) 
                max_y = temp_y;
            if (temp_y < min_y) 
                min_y = temp_y;

            int pass_x = ((max_x - min_x) / 2);
            int pass_y((max_y - min_y) / 2);

            setCoordinates(pass_x, pass_y);
            connectivity(temp, y, x);
        }
    }
}

这是代码的其余部分。上述connectivity()方法位于BLOB类。

#include "opencv2/opencv.hpp"
#include<stdio.h>
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"

using namespace cv;
using namespace std;

class BlobBurnMat{
//Class used to store a copy of the source image where pixels get burned in BLOB finding.

    private:
        Mat temp;
    public:
        void initiate(Mat temp){
        this -> temp = temp;
        }
    Mat getTemp(){
        return temp;
    }
    void setValZero(int x, int y){
        temp.at<uchar>(y, x) = 0;
    }
};

class BLOB{
//BLOB class to store coordinates of the BLOBs before they are added to the vector-array-list-thingamajig

    private:
        int x, y;
    public:

    void setCoordinates(int x, int y){
        this->x = x;
        this->y = y;
    }
    int getX(){
        return x;
    }
    int getY(){
        return y;
    }

    void connectivity(BlobBurnMat temp){
        connectivity(temp, x, y);
    }

    void connectivity(BlobBurnMat temp, int y, int x){
        uchar* ptr = (uchar*)temp.getTemp().data;
        int min_y = temp.getTemp().rows, min_x = temp.getTemp().cols, max_y = 0, max_x = 0;

        for (int i = 0; i < 4; i++){
            int kernel[4][2] = { { 0, 1 }, { 1, 0 }, { 0, -1 }, { -1, 0 } };
            int temp_y = y + kernel[i][0];
            int temp_x = x + kernel[i][1];
            uchar val = ptr[temp.getTemp().step * temp_y + temp_x];

            if (val == 255) {
                temp.setValZero(x, y);
                x = temp_x;
                y = temp_y;

                if (temp_x > max_x) 
                    max_x = temp_x;
                if(temp_x < min_x) 
                    min_x = temp_x;
                if (temp_y > max_y) 
                    max_y = temp_y;
                if (temp_y < min_y) 
                    min_y = temp_y;

                int pass_x = ((max_x - min_x) / 2);
                int pass_y((max_y - min_y) / 2);

            setCoordinates(pass_x, pass_y);
            connectivity(temp, y, x);
            }
        }
    }
};

vector<Point2i> getBlobCoordinates(Mat src){
    BlobBurnMat *temp = new BlobBurnMat();
    temp->initiate(src.clone());

    vector<Point2i> blobCoordinates; //Vector holding all BLOB coordinates
    Point2i blobCoords; //Coordinates of a single BLOB

    //Go through the binary matrix looking for white pixels.
    for (size_t y = 0; y < src.rows; y++) {
        for (size_t x = 0; x < src.cols; x++) {

            uchar* ptr = (uchar*)temp->getTemp().data;
            uchar val = ptr[temp->getTemp().step * y + x];

            if (val == 255){

                BLOB *blob = new BLOB();
                blob->setCoordinates(x, y);

                blob->connectivity(*temp);

                blobCoords.x = blob->getX();
                blobCoords.y = blob->getY();

                blobCoordinates.push_back(blobCoords); //add a new element to the vector.

            }
        }
    }
    return blobCoordinates;
}


int main(int, char){
    Mat src;
    String path = "C:/Users/Runagar/Desktop/segment.jpg";
    src = imread(path, 0);
    if (src.data && !src.empty()){
        imshow("blobie", src);
    }
    else cout << "You fucked up ";

    vector <Point2i> blobCoordinates = getBlobCoordinates(src);
    for (int k = 0; k < blobCoordinates.size(); k++)
        cout << blobCoordinates[k];

    waitKey(0);
    return 0;
}

提前致谢！

Answer 1

当i == 2且x == 0时，temp_x == -1所以你在分配内存之外的ptr之前读取1个字节。

当x == 0，y == 0，x == src.cols和y == src.rows时，你必须处理这种情况。

Answer 2

Mat getTemp()会返回您的Mat实例的副本。

uchar* ptr = (uchar*)temp.getTemp().data;从临时Mat实例中检索指针。然后立即删除此实例，并留下指向（可能）正确删除的数据的指针。

请尝试Mat & getTemp()。

未处理的异常。访问违规阅读位置

2 个答案: