C ++ OpenCV断言失败错误

Question

我试图创建一个代码，将像素从一个图像复制到另一个图像并以不同方式排列，但是我收到错误

OpenCV错误：断言失败0＆amp;＆amp; size.height大于0＆GT;在cv :: imshow中，文件C：\ builds \ 2_4_PackSlave-win64-vc12-shared \ opencv \ modules \ highgui \ src \ window.cpp，第261行

这是代码

int main(int argc, char** argv) {
Mat src = imread("srcImg.jpg", 1);
Mat dst = imread("dstImg.jpg", 1);
int srcH = src.rows; int srcW = src.cols;
int dstH = dst.rows; int dstW = src.cols;

double alpha;
int r = 50;

for (int i = 0; i < srcH; i++) {
    for (int j = 0; j < srcW; j++) {
        alpha = i / r;
        dst.at<uchar>(dstW / 2 * cos(alpha), 
            (dstH / 2 + r) * sin(alpha)) = src.at<uchar>(i, j);
    }
}

imshow("Source", src);
imshow("Result", dst);

return 0;

这里有什么问题？