Question

我正在尝试对图像应用滤镜，滤镜窗口（3x3）的输出存储在矢量中（只有非零值丢弃零值）。我想添加vector的前四个值并将答案存储在输出图像中。运行程序会生成错误＆＃34;向量下标超出范围＆＃34;。不知道我在做错的地方。

Mat Diff;//input image
int window[9];
Mat road;//output image

road = Diff.clone();
for (int y = 0; y < Diff.rows; y++)
for (int x = 0; x < Diff.cols; x++)
    road.at<uchar>(y, x) = 0;
//Apply road filter

for (int y = 1; y < Diff.rows - 1; y++){
    for (int x = 1; x < Diff.cols - 1; x++){

        // Pick up window element

        window[0] = abs(Diff.at<uchar>(y - 1, x - 1) - Diff.at<uchar>(y, x));
        window[1] = abs(Diff.at<uchar>(y, x - 1) - Diff.at<uchar>(y, x));
        window[2] = abs(Diff.at<uchar>(y + 1, x - 1) - Diff.at<uchar>(y, x));
        window[3] = abs(Diff.at<uchar>(y - 1, x) - Diff.at<uchar>(y, x));
        window[4] = abs(Diff.at<uchar>(y, x) - Diff.at<uchar>(y, x));
        window[5] = abs(Diff.at<uchar>(y + 1, x) - Diff.at<uchar>(y, x));
        window[6] = abs(Diff.at<uchar>(y - 1, x + 1) - Diff.at<uchar>(y, x));
        window[7] = abs(Diff.at<uchar>(y, x + 1) - Diff.at<uchar>(y, x));
        window[8] = abs(Diff.at<uchar>(y + 1, x + 1) - Diff.at<uchar>(y, x));

        int road_detector = 0;
        vector<int>nonzero_elements;
        for (int n = 0; n < 9;n++){
            if (window[n]>0){

                nonzero_elements.push_back(window[n]);
                // select the first non-zero four values of window and sum them
                //road.at<uchar>(y, x) = window[0]+window[1]+window[2]+window[3];
                if (nonzero_elements.size() <4){

                    road_detector += nonzero_elements[n];

                }
                else{
                    // sort the window  
                    sort(nonzero_elements.begin(), nonzero_elements.end());
                    road_detector = nonzero_elements.at(0) + nonzero_elements.at(1) + nonzero_elements.at(2) + nonzero_elements.at(3);
                }
            }

        }road.at<uchar>(y, x) = road_detector;
        nonzero_elements.clear();                           

    }
}

Answer 1

假设您在FirebaseObjectObservable中有所有负值，除了存储在最后一个索引中的值。现在，您将仅推送window[]中的一个元素，因此其大小为1.但您正在访问nonzero_elements的第8个元素，因此超出范围。

opencv图像处理，矢量下标超出范围

1 个答案: