OpenCV：斷言失敗

Question

當我嘗試使用adaptiveThreshold() 函數時，我遇到了這種類型的錯誤。 可能出了什么問題？

這是我的代碼：

int main()
{
    try 
    {
        cv::Mat img = cv::imread("rubikscube.png");
        cv::Mat thres_final;
        cv::Mat adap_thres_final;

        cv::threshold(img, thres_final, 0, 255, CV_THRESH_BINARY);
        cv::adaptiveThreshold(img, adap_thres_final, 255, CV_ADAPTIVE_THRESH_GAUSSIAN_C, CV_THRESH_BINARY, 11, 2);

        cv::namedWindow("Source");
        cv::imshow("Source", img);

        cv::namedWindow("Threshold");
        cv::imshow("Threshold", thres_final);

        cv::namedWindow("Adaptive Threshold");
        cv::imshow("Adaptive Threshold", adap_thres_final);

        cv::waitKey(0);

    }
    catch (...)
    {
        std::cout << "Exception Occured! \n";
    }

    return 0;
}

Answer 1

當我在我的機器上運行此代碼時，出現以下錯誤

OpenCV Error: Assertion failed (src.type() == CV_8UC1) in adaptiveThreshold, file /Users/lakshayg/dev/opencv/modules/imgproc/src/thresh.cpp, line 795

adaptiveThreshold CV_8UC1接受CV_8UC1類型的圖像，但您傳遞的是CV_8UC3 。

解決此問題的一種方法是首先將圖像讀取為灰度。

更改為的imread調用

cv::Mat img = cv::imread("rubikscube.png", CV_LOAD_IMAGE_GRAYSCALE);

此處的CV_LOAD_IMAGE_GRAYSCALE指示函數將圖像讀取為灰度。