OpenCV输出奇数像素值 [英] OpenCV outputing odd pixel values

问题描述

我想使用C ++对图像进行处理，并且一直在使用OpenCV.但是，在尝试分别访问每个像素时，我有些卡住了.我可以使用以下命令很好地输出整个灰度图像:

I want to do processing on images with C++ and have been using OpenCV. I've gotten a bit stuck though when it comes to trying to access each pixel individually. I can output the whole gray scaled image just fine using:

cout<<图片；

并获得预期值的输出，如下所示:

and get the expected output of values like so:

[143, 147, 164, 177, 177, 185, 196, 195, 185, 186, 178, 190, 178, 163, 183...

但是当我尝试使用以下命令一次输出一个像素时:

But when I try to output one pixel at a time using:

for (int y = 0; y < image.rows; ++y) {
    for (int x = 0;x < image.cols; ++x) {
        std::cout<<image.at<double>(y, x)<<" ";
    }
            cout << endl;}

我的输出是一堆像这样的大数字:

my output is a bunch of large numbers like these:

-2.98684e+18 -1.21685e-83 -1.91543e-113 -1.8525e-59 -2.73052e-127 -2.08731e-35 -3.72066e-103 ...

对我遗失或做错的事情有什么想法吗?

Any thoughts as to what I am missing or doing wrong?

推荐答案

如果要打印图像的所有像素，只需使用:

If you want to print all pixels of the image, you can simply use:

cout << image << endl;

如果要打印像素，请使用:

If you want to print a pixel, use:

cout << image.at<Vec3b>(y, x) << endl; // for color image

或

cout << (int) image.at<uchar>(y, x) << endl; // for gray-scale image

请注意，在最后一行中，需要将其强制转换为 int .有关详细信息，请查看为什么"cout"对于"unsigned char"来说很奇怪?.

Note that, in the last line, casting it to int is needed. For details, check out Why "cout" works weird for "unsigned char"?.

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