cv::Mat3b OpenCVUtil::pad_image(const cv::Mat3b& image, int paddingSize)
{
cv::Mat3b paddedImage = cv::Mat3b::zeros(image.rows + paddingSize * 2, image.cols + paddingSize * 2);
cv::Rect roi(paddingSize, paddingSize, image.cols, image.rows);
image.copyTo(paddedImage(roi));
return paddedImage;
}
int main() {
QImage source{64, 64, QImage::Format_ARGB32_Premultiplied};
source.fill(Qt::red);
auto padded = paddedImage(source, 16, Qt::blue);
padded.save("test.png");
}