OpenCV使用外来字符 [英] OpenCV imread with foreign characters

问题描述

我们正在使用C ++中的OpenCV 2.4.6和Qt 5.1.1项目。我们必须在我们的代码中的几个点加载图像进行图像处理，我们使用 cv :: imread 作为正常。然而，我们想让软件与其他语言文件系统兼容，并发现具有外部字符的文件路径将无法加载。

We're working on a project using OpenCV 2.4.6 and Qt 5.1.1 in C++. We have to load images for image processing at several points in our code, which we did using cv::imread, as normal. However, we wanted to make software compatible with other language filesystems, and found that having file paths with foreign characters would fail to load.

我们认为，这个问题与 imread 只能接受 std :: string （或 char * ），并将一个非拉丁1符号的路径转换为 std :: string 导致在UTF-8中使用多个字节的字符（用于 QString 的编码，这是我们如何存储路径）转换为多个字符。

The problem, we believe, has to do with the fact that imread can only take in a std::string (or char*), and casting a path with non Latin-1 symbols to a std::string results in characters that use multiple bytes in UTF-8 (the encoding used for QString, which is how we store the paths) being converted to multiple chars.

为了确认文件路径是否有效，我们通过将 wstring code> ifstream ，它成功打开文件并读取位。我们当前的攻击是将图像加载为 QImage ，然后将数据复制到 cv :: Mat ，但这不是一个令人满意的解决方案，主要是因为我们理解它， Qt :: QImage 加载图像的8位格式，我们的图像是一个更高的位深度。

To confirm that the file paths are valid, we've opened them by passing a wstring to a regular ifstream, which successfully opens the file and reads bits. Our current hack is to load the image as a QImage and then copy the data to a cv::Mat, but this isn't a satisfying solution, for multiple reasons, chiefly that as we understand it, Qt::QImage loads images in 8bit format, and our images are of a higher bit depth.

有没有干净的方法来解决这个问题？我看到了此问题，但 toAscii 已弃用，它的替代品不为我们工作。我们已经尝试了以下方法将 QString 转换为 std :: string 并将它们传递给 imread 。

Is there any "clean" way to get around this? I saw this questions, but toAscii is deprecated, and its replacements didn't work for us. We've tried the following ways of converting the QString to a std::string and passing them to imread.

QString :: toStdString（）， QString :: toUtf8（）。data（）， QString :: toLocal8Bit（）。data（）， QString :: toLatin1（）。data（）。他们似乎产生大致相同的结果。

QString::toStdString(), QString::toUtf8().data(), QString::toLocal8Bit().data(), QString::toLatin1().data(). They all appear to yield roughly the same results.

提前感谢。

推荐答案

$ c> QString :: toStdWString（）然后将结果 std :: wstring 转换为 std :: string 。

You can try QString::toStdWString() and then convert the resulting std::wstring to std::string.

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