c++ - OpenCV 2.4.9 reads blank image

Question

Folks,

I am using imread to load a jpeg image into a cv::Mat data type. However, the function is unable to load the image and simply returns an empty matrix with 0 rows and 0 columns. It does not throw any exceptions or warnings. I have also verified that the image actually exists in the path specified. I have never seen this behaviour in OpenCV and am at a loss to figure out what is going on. Any help is appreciated

EDIT: After playing around, I discovered that it is able to read in PNG file formats with no problems.

Answer 1

我找到了解决这个问题的方法。我从源代码编译了 OpenCV，当我最初构建和安装它时，它缺少某些 JPEG 相关库。为了解决它，我重新配置了源目录（通过运行 cmake）并手动安装了它没有找到的库。这些对于 OpenCV 来说并不重要，因此它不会阻止安装。之后我重新编译并重新安装了 OpenCV。