How to check if OpenCV was compiled with TBB, CUDA or Qt support?

Question

How can I find out whether OpenCV library was compiled with TBB or CUDA or QT on Windows 7 machine? Should I use dependency walker, and if so, how? Or is there another way to find out?

Answer 1

You can know it by opening a python3 REPL in cmdline:

python3

Then importing opencv:

import cv2

Then printing build information:

print(cv2.getBuildInformation())

And look for CUDA and related GPU information.

Answer 2

following up on dpetrini's answer, You can add whatever support to want to regex search in this to pretty-fy the outputs, instead of searching for it in the build-info outputs.

import cv2
import re

cv_info = [re.sub('\s+', ' ', ci.strip()) for ci in cv2.getBuildInformation().strip().split('\n') 
               if len(ci) > 0 and re.search(r'(nvidia*:?)|(cuda*:)|(cudnn*:)', ci.lower()) is not None]
print(cv_info)

['NVIDIA CUDA: YES (ver 10.0, CUFFT CUBLAS FAST_MATH)', 'NVIDIA GPU arch: 75', 'NVIDIA PTX archs:', 'cuDNN: YES (ver 7.6.5)']