如何转换QImage到opencv Mat [英] How to convert QImage to opencv Mat

问题描述

我已在互联网上搜索，但我找不到将 QImage （或 QPixmap ）转换为OpenCV Mat 。

I have searched on the internet but I cannot find a method of converting a QImage(or QPixmap) to a OpenCV Mat. How would I do this?.

推荐答案

如果QImage仍然存在，你只需要对它执行快速操作，那么ou可以使用QImage内存构造一个cv :: Mat

If the QImage will still exist and you just need to perform a quick operation on it then ou can construct a cv::Mat using the QImage memory

cv :: Mat mat（image.rows（），image.cols（），CV_8UC3，image.scanline（））;
假设Qimage是3channels RGB888

cv::Mat mat(image.rows(),image.cols(),CV_8UC3,image.scanline()); This assumes that the Qimage is 3channels, ie RGB888

如果Qimage正在消失，那么您需要复制数据，请参阅

If the Qimage is going away then you need to copy the data, see Qimage to cv::Mat convertion strange behaviour

如果QImage是Format_ARGB32_Premultiplied（优先格式），那么你的将需要将每个像素转换为openCV的BGR布局。 cv :: cvtcolor（）函数可以在最新版本中将ARGB转换为RGB。

或者您可以使用 QImage :: convertToformat（）在复制数据之前转换为RGB

If QImage is Format_ARGB32_Premultiplied (the preffered format) then you will need to convert each pixel to openCV's BGR layout. The cv::cvtcolor() function can convert ARGB to RGB in the latest versions.
Or you can use QImage::convertToformat() to convert to RGB before copying the data

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