無法重新找到棋盤角落

Question

我有一個程序，主要是拍攝圖像並嘗試找到一個棋盤。如果成功的話，它的圖像寫入.jpg文件。然而，當我再次試圖找到新創建的.jpg文件的棋盤，我失敗了。有誰知道爲什麼？

這裏是我的代碼：

#include <ros/ros.h> 
#include <image_transport/image_transport.h> 
#include <cv_bridge/cv_bridge.h> 
#include <sensor_msgs/image_encodings.h> 
#include <opencv2/imgproc/imgproc.hpp> 
#include <opencv2/highgui/highgui.hpp> 
#include <opencv2/calib3d/calib3d.hpp> 
#include <opencv2/opencv.hpp> 
#include <vector> 

namespace enc = sensor_msgs::image_encodings; 

using namespace cv ; 

int board_w ; 
int board_h ; 

int findChess(cv::Mat image) { 
    cv::Size board_sz(board_w, board_h); 
    int numSquares = board_w * board_h ; 
    std::vector<cv::Point2f> corners ; 

    std::vector<cv::Point3f> obj ; 
    for (int i = 0 ; i < numSquares ; i++) { 
    obj.push_back(cv::Point3f(i/board_w, i % board_w, 0)) ; 
    } 

    // find the inner corners of the chessboard 
    int found = cv::findChessboardCorners(image, board_sz, corners, 
        cv::CALIB_CB_ADAPTIVE_THRESH | cv::CALIB_CB_NORMALIZE_IMAGE | 
        cv::CALIB_CB_FAST_CHECK) ; 

    if (!found) { 
    ROS_ERROR("Couldn't find the corners, re-trying") ; 
    return -1 ; 
    } 

    // draw the found corners on a copy of the original image 
    if (found) { 
    ROS_INFO("Yeah, we found the board.") ; 

    cv::Mat tmp = image.clone() ; 
    cv::Mat generatedImage ; 

    cv::drawChessboardCorners(tmp, board_sz, corners, 1) ; 
    cv::namedWindow("FOUND IMAGE") ; 
    cv::imshow("FOUND IMAGE" , tmp) ; 
    cv::imwrite("found.jpeg", image) ; 

    generatedImage = imread("found.jpeg", -1) ; 
     // find the inner corners of the chessboard 

    int found = cv::findChessboardCorners(generatedImage, board_sz, corners, 
         cv::CALIB_CB_ADAPTIVE_THRESH | cv::CALIB_CB_NORMALIZE_IMAGE | 
         cv::CALIB_CB_FAST_CHECK) ; 

    if (found) { 
     ROS_INFO("Corners are refound.") ; 
    } 
    else { 
     ROS_INFO("Corners are not refound.") ; 
    } 

    waitKey(0) ; 
    } 

    return 0 ; 
} 

Answer 1

發現了問題，它保存爲.png文件，而不是一個.jpeg文件，現在正常工作。