OpenCV imshow 不在 osx 中显示图像 [英] OpenCV imshow not displaying image in osx

问题描述

我正在写一本书，并复制了以下代码(本质上是hello world"的 openCV 等价物):

//helloCV.cpp#include int main(int argc, char** argv){cv::Mat img = cv::imread(argv[1], -1);如果 (img.empty()) 返回 -1;cv::namedWindow("Example1", cv::WINDOW_AUTOSIZE);cv::imshow("Example1", img);简历::等待键(0);cv::destroyWindow("Example1");返回0；}//主要的

不幸的是，当我运行这段代码时，我得到了一个带有标题的窗口，里面什么也没有:

我怀疑在安装 OpenCV 时我搞砸了环境或某些类似的东西，但是 cmake 没有抛出任何错误，并且代码按预期运行，在击键时正确退出等等，除了一个明显的例外缺少显示的照片.

有什么建议吗?

谢谢！

解决方案

感谢 @DanMašek 在这方面的领导，以及此页面上的所有人:http://answers.opencv.org/question/160201/video-window-not-loading-frame/

重复他们所说的，对我有用的是以下内容:

<块引用>

要解决此问题，请找到文件 window_cocoa.mm；如果从源代码构建，它将在 opencv/modules/highgui/src 中.

更改以下内容:

@implementation CVView#如果已定义(__LP64__)@合成图像；#else//32 位 Obj-C 没有自动合成@合成图像 = _image;#万一

<块引用>

为此:

@implementation CVView@合成图像 = _image;

<块引用>

对 CVWindow 和 CVSlider 实现做同样的事情以适应视频.

重新编译 OpenCV 并测试您的代码.

希望这能帮助其他在这个问题上苦苦挣扎的人！

I'm working right out of a book, and copied the following code (essentially the openCV equivalent of "hello world"):

//helloCV.cpp
#include <opencv2/opencv.hpp>

int main(int argc, char** argv){

        cv::Mat img = cv::imread(argv[1], -1);
        if (img.empty()) return -1;

        cv::namedWindow("Example1", cv::WINDOW_AUTOSIZE);
        cv::imshow("Example1", img);
        cv::waitKey(0);
        cv::destroyWindow("Example1");

        return 0;

}//main 

Unfortunately, when I run this code, I get a window with the header and nothing in it:

I suspect that I've messed up the environment or some such when installing OpenCV, but cmake is throwing no errors, and the code runs as expected, exiting correctly on a keystroke and all of that, with the glaring exception of a lack of a displayed photo.

Any tips?

Thanks!

解决方案

Thanks to @DanMašek for the lead on this one, and to all the people on this page: http://answers.opencv.org/question/160201/video-window-not-loading-frame/

To repeat what they said, what worked for me was the following:

To resolve this, locate the file window_cocoa.mm; if built from source it'll be in opencv/modules/highgui/src.

Change the following:

@implementation CVView
#if defined(__LP64__)
@synthesize image;
#else // 32-bit Obj-C does not have automatic synthesize
@synthesize image = _image;
#endif

To this:

@implementation CVView
@synthesize image = _image;

Do the same thing for the CVWindow and CVSlider implementations to accommodate videos as well.

Recompile OpenCV and test out your code.

Hope this helps other people struggling with this issue!

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