Question

#include <fstream>
#include <iostream>
#include <string>
#include <stdlib.h>
#include <stdio.h>
#include <iomanip>
#include <stdio.h>

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

using namespace cv;
using namespace std;

int main(int argc, char** argv)
{
    ofstream fout("E:\\FYP\\image analysis\\ImageAnalysis\\ImageAnalysis\\Cropped_Image\\Details.txt");

    Mat image = imread("rsz_2rsz_2iron-man.png", -1);

    //Declare global parameters
    int     kernel = 3;                     //to be input
    int     levels = 16;                    //to be input
    int     gap = 5;                        //to be input in mm
    double  depth_gap = 0.2;                //to be input in mm
    int     feedrate = 300;                 //to be input
    int     background = 0;
    int     width = image.cols;
    int     height = image.rows;
    double  x_window = width / kernel;
    double  y_window = height / kernel;
    int     x_anchor = 0;
    int     y_anchor = 0;
    double  height_threshold = 0;
    double  width_threshold = 0;

    int   max_img_width = 570; //in mm
    int   max_img_height = 480; //in mm

    cout << width << "x " << height << endl;
    cout << "(Physical Dimension    : " << x_window * gap << " mm x " << y_window *gap << " mm)" << endl << endl;

    height_threshold = ceil((y_window *gap) / max_img_height);
    width_threshold = ceil((x_window * gap) / max_img_width);

    int   width_panel = (x_window * gap) / width_threshold;
    int   height_panel = (y_window *gap) / height_threshold;
    int   no_panels = height_threshold * width_threshold;

    cout << "No. of panels = " << height_threshold * width_threshold << endl;
    cout << width_threshold << " (x-axis) x " << height_threshold << " (y-axis)" <<  endl << endl;

    cout << "Size of each panels : " << (x_window * gap) / width_threshold << "mm (x-axis) by " << (y_window *gap) / height_threshold << "mm (y-axis)" << endl << endl;

    //imshow("Original Image", image);

    int image_width = width / width_threshold;
    int image_height = height / height_threshold;

    cout << image_height << " vs " << image_width << endl;

    vector<Mat> smallImages;

    for (int y = 0; y < height; y += image_height)
    {
        for (int x = 0; x < width; x += image_width)
        {
            Rect rect = Rect(x, y, image_width, image_height);
            smallImages.push_back(Mat(image, rect));
        }
    }


    //For displaying and saving cropped image
    for (int panel = 0; panel < no_panels; panel += 1)
    {
        string num_panel = to_string(panel);
        string filetype = ".png";
        string filename = "Image " + num_panel + filetype;
        //cout << num_panel << endl;
        //imshow(filename, smallImages[panel]);
        //waitKey(0);
        string location = "E:\\FYP\\image analysis\\ImageAnalysis\\ImageAnalysis\\Cropped_Image\\" + filename;
        imwrite(location, smallImages[panel]);
    }

    fout << "Kernel = " << kernel << endl;
    fout << "Levels = " << levels << endl;
    fout << "Gap = " << gap << endl;
    fout << "Max Height = " << max_img_width << endl;
    fout << "Max Width = " << max_img_height << endl;
    fout << "Number of Panels = " << height_threshold * width_threshold << endl;
    fout << "Size of each panels : " << (x_window * gap) / width_threshold << "mm (x-axis) by " << (y_window *gap) / height_threshold << "mm (y-axis)" << endl << endl;

    waitKey(0);
    system("PAUSE"); 
    //return 0;
}

该程序是根据给定的最大宽度和高度以及其他一些属性将大图像分成多个图像。

当我运行具有不同内核大小的程序时，有时它会断言断言失败，有时候还可以。

错误：

OpenCV Error: Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x + roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in cv::Mat::Mat, file C:\builds\master_PackSlave-win64-vc12-shared\opencv\modules\core\src\matrix.cpp, line 508
OpenCV Error: Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x + roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in cv::Mat::Mat, file C:\builds\master_PackSlave-win64-vc12-shared\opencv\modules\core\src\matrix.cpp, line 508
OpenCV Error: Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x + roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in cv::Mat::Mat, file C:\builds\master_PackSlave-win64-vc12-shared\opencv\modules\core\src\matrix.cpp, line 508
OpenCV Error: Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x + roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in cv::Mat::Mat, file C:\builds\master_PackSlave-win64-vc12-shared\opencv\modules\core\src\matrix.cpp, line 508
OpenCV Error: Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x + roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in cv::Mat::Mat, file C:\builds\master_PackSlave-win64-vc12-shared\opencv\modules\core\src\matrix.cpp, line 508

Answer 1

您正在获取图像外部的矩形。这是因为for循环中的错误条件。使用：

 for (int y = 0; y <= (height - image_height); y += image_height)
 {
     for (int x = 0; x <= (width - image_width); x += image_width)
     {
          Rect rect = Rect(x, y, image_width, image_height);
          smallImages.push_back(Mat(image, rect));
     }
 }

仅当height和width分别是image_height和image_width的倍数时，您的原始条件才是正确的。

在roi里面OpenCV断言失败了吗？

1 个答案: