c++ - 使用 Open CV 迭代器

Question

我想做类似 eigenfaces 的事情但具有不同的图像(不是面孔)。我有一个图像 vector ，images。从这些图像中，我想制作一个 Mat 对象，data 在每一行中包含一个写为行 vector 的图像。这是我尝试做的:

// This is basically a matrix that needs to have a bunch of images as rows.
Mat data(numImages, IMAGE_SIZE * IMAGE_SIZE, CV_8UC1);
// I also replaced CV_8U by images[0].type() and CV_8U. no change
MatIterator_<unsigned short> iter = data.begin<unsigned short> (),
                             iter_end = data.end<unsigned short> (), 
                             iter2;

for (i = 0; i < numImages; ++i)
{
    MatIterator_<unsigned short> begin = images[i].begin<unsigned short> ();
    MatIterator_<unsigned short> end = images[i].end<unsigned short> ();
    for (iter2 = begin; iter2 != end; iter2++)
    {
        *iter = *iter2; // Segfault is here.
        if (iter != iter_end) // safety check
            iter++;
        else
            perror("Screwed!\n"); // This does not execute!
    }
}

求助!

谢谢!

Answer 1

我认为在您的矩阵中每个字段都有 1 个字节 (CV_8UC1)，但您的迭代器是“unsigned short”迭代器。 Unsigned short 通常 有 2 个字节。改成

data.begin<unsigned char> ()

还要检查 stdint.h:http://en.wikipedia.org/wiki/Stdint.h