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Object detection using deep learning with OpenCV and Python

OpenCV dnn module supports running inference on pre-trained deep learning models from popular frameworks like Caffe, Torch and TensorFlow.

When it comes to object detection, popular detection frameworks are

  • YOLO
  • SSD
  • Faster R-CNN

Support for running YOLO/DarkNet has been added to OpenCV dnn module recently.


  • opencv
  • numpy

pip install numpy opencv-python

Note: Compatability with Python 2.x is not officially tested.

YOLO (You Only Look Once)

Download the pre-trained YOLO v3 weights file from this link and place it in the current directory or you can directly download to the current directory in terminal using

$ wget

Provided all the files are in the current directory, below command will apply object detection on the input image dog.jpg.

$ python --image dog.jpg --config yolov3.cfg --weights yolov3.weights --classes yolov3.txt

Command format

$ python --image /path/to/input/image --config /path/to/config/file --weights /path/to/weights/file --classes /path/to/classes/file

Checkout the blog post to learn more.

sample output :

Checkout the object detection implementation available in cvlib which enables detecting common objects in the context through a single function call detect_common_objects().

(SSD and Faster R-CNN examples will be added soon)