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Clone/Download this folder. 
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cd Flask-ObjDetect
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Run pip install -r requirements.txt
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Then run python app.py
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Now click on the localhost link(http://127.0.0.1:5000/) as displayed in in your cmd upon running this app.pyfile. You could also copy-paste the link in your browser.
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Uplaod an image and click on Submit button. You will be displayed the Detected Objects. 
To better understand the code of Object Detection step-wise, it is highly recommended to visit the Object_Detection_and_Segmentation_with_OpenCV_and_Tensorflow_mask_RCNN.ipynb Jupyter notebook.