Fastest method to convert IplImage IPL_DEPTH_32S to QImage Format_RGB32

Question

What is the fastest method to convert IplImage IPL_DEPTH_32S to QImage Format_RGB32?

I need to catch pictures from cam and show it on form with frequency 30 frames in se

Answer 1

IPL_DEPTH_32S is greyscale with a 32bit pixel - normally used for depth data rather than an actual 'image', if you are packign a colour image into check what the pixel ordering is.

QImage::Format_ARGB32_Premultiplied is the fastest QImage format because its what the graphics card uses - note that the data order is actually BGRA and the A channel must be at least as large as the pixel, ie 255 if you don't want to use alpha.

There is a RGB2BGRA and BGR2RGBA in cv::cvtColor()