cv::Mat转QImage(商业源码)

QImage Mat2QImage(const cv::Mat& mat)
{
	if (mat.empty())
	{
		return QImage();
	}
	if (mat.type() == CV_8UC1)
	{
		QImage image(mat.cols, mat.rows, QImage::Format_Indexed8);
		image.setColorCount(256);
		for (int i = 0; i < 256; i++)
		{
			image.setColor(i, qRgb(i, i, i));
		}
		uchar* pSrc = mat.data;
		for (int row = 0; row < mat.rows; row++)
		{
			uchar* pDest = image.scanLine(row);
			memcpy(pDest, pSrc, mat.cols);
			pSrc += mat.step;
		}
		return image;
	}
	else if (mat.type() == CV_8UC3)
	{
		const uchar* pSrc = (const uchar*)mat.data;
		QImage image(pSrc, mat.cols, mat.rows, mat.step, QImage::Format_RGB888);
		return image.rgbSwapped();
	}
	else if (mat.type() == CV_8UC4)
	{
		const uchar* pSrc = (const uchar*)mat.data;
		QImage image(pSrc, mat.cols, mat.rows, mat.step, QImage::Format_ARGB32);
		return image.copy();
	}
	else
	{
		return QImage();
	}
}

opencv cv::Mat转QT中的QImage