Interesting Python Project of Gender and Age Detection with OpenCV

Today, we are introducing our fourth python project that is gender and age detection with OpenCV. It is very interesting and one of my favorite project. DataFlair has published more interesting python projects on the following topics with source code:

  1. Fake News Detection Python Project 
  2. Parkinson’s Disease Detection Python Project 
  3. Color Detection Python Project
  4. Speech Emotion Recognition Python Project 
  5. Breast Cancer Classification Python Project 
  6. Age and Gender Detection Python Project
  7. Handwritten Digit Recognition Python Project
  8. Chatbot Python Project
  9. Driver Drowsiness Detection Python Project
  10. Traffic Signs Recognition Python Project
  11. Image Caption Generator Python Project

If these projects are helping you then please share your feedback with us. It will motivate us, to provide more such useful content you.

Without talking much, let’s start the gender and age detection Python Project.

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Gender and Age Detection Python Project

First introducing you with the terminologies used in this advanced python project of gender and age detection –

What is Computer Vision?

Computer Vision is the field of study that enables computers to see and identify digital images and videos as a human would. The challenges it faces largely follow from the limited understanding of biological vision. Computer Vision involves acquiring, processing, analyzing, and understanding digital images to extract high-dimensional data from the real world in order to generate symbolic or numerical information which can then be used to make decisions. The process often includes practices like object recognition, video tracking, motion estimation, and image restoration.

What is OpenCV?

OpenCV is short for Open Source Computer Vision. Intuitively by the name, it is an open-source Computer Vision and Machine Learning library. This library is capable of processing real-time image and video while also boasting analytical capabilities. It supports the Deep Learning frameworks TensorFlow, Caffe, and PyTorch.

What is a CNN?

A Convolutional Neural Network is a deep neural network (DNN) widely used for the purposes of image recognition and processing and NLP. Also known as a ConvNet, a CNN has input and output layers, and multiple hidden layers, many of which are convolutional. In a way, CNNs are regularized multilayer perceptrons.

Gender and Age Detection Python Project- Objective

To build a gender and age detector that can approximately guess the gender and age of the person (face) in a picture using Deep Learning on the Adience dataset.

Gender and Age Detection – About the Project

In this Python Project, we will use Deep Learning to accurately identify the gender and age of a person from a single image of a face. We will use the models trained by Tal Hassner and Gil Levi. The predicted gender may be one of ‘Male’ and ‘Female’, and the predicted age may be one of the following ranges- (0 – 2), (4 – 6), (8 – 12), (15 – 20), (25 – 32), (38 – 43), (48 – 53), (60 – 100) (8 nodes in the final softmax layer). It is very difficult to accurately guess an exact age from a single image because of factors like makeup, lighting, obstructions, and facial expressions. And so, we make this a classification problem instead of making it one of regression.

The CNN Architecture

The convolutional neural network for this python project has 3 convolutional layers:

  • Convolutional layer; 96 nodes, kernel size 7
  • Convolutional layer; 256 nodes, kernel size 5
  • Convolutional layer; 384 nodes, kernel size 3

It has 2 fully connected layers, each with 512 nodes, and a final output layer of softmax type.

To go about the python project, we’ll:

  • Detect faces
  • Classify into Male/Female
  • Classify into one of the 8 age ranges
  • Put the results on the image and display it

The Dataset

For this python project, we’ll use the Adience dataset; the dataset is available in the public domain and you can find it here. This dataset serves as a benchmark for face photos and is inclusive of various real-world imaging conditions like noise, lighting, pose, and appearance. The images have been collected from Flickr albums and distributed under the Creative Commons (CC) license. It has a total of 26,580 photos of 2,284 subjects in eight age ranges (as mentioned above) and is about 1GB in size. The models we will use have been trained on this dataset.


You’ll need to install OpenCV (cv2) to be able to run this project. You can do this with pip-

pip install opencv-python

Other packages you’ll be needing are math and argparse, but those come as part of the standard Python library.

Steps for practicing gender and age detection python project

1. Download this zip. Unzip it and put its contents in a directory you’ll call gad.

The contents of this zip are:

  • opencv_face_detector.pbtxt
  • opencv_face_detector_uint8.pb
  • age_deploy.prototxt
  • age_net.caffemodel
  • gender_deploy.prototxt
  • gender_net.caffemodel
  • a few pictures to try the project on

For face detection, we have a .pb file- this is a protobuf file (protocol buffer); it holds the graph definition and the trained weights of the model. We can use this to run the trained model. And while a .pb file holds the protobuf in binary format, one with the .pbtxt extension holds it in text format. These are TensorFlow files. For age and gender, the .prototxt files describe the network configuration and the .caffemodel file defines the internal states of the parameters of the layers.

2. We use the argparse library to create an argument parser so we can get the image argument from the command prompt. We make it parse the argument holding the path to the image to classify gender and age for.

3. For face, age, and gender, initialize protocol buffer and model.

4. Initialize the mean values for the model and the lists of age ranges and genders to classify from.

5. Now, use the readNet() method to load the networks. The first parameter holds trained weights and the second carries network configuration.

6. Let’s capture video stream in case you’d like to classify on a webcam’s stream. Set padding to 20.

7. Now until any key is pressed, we read the stream and store the content into the names hasFrame and frame. If it isn’t a video, it must wait, and so we call up waitKey() from cv2, then break.

8. Let’s make a call to the highlightFace() function with the faceNet and frame parameters, and what this returns, we will store in the names resultImg and faceBoxes. And if we got 0 faceBoxes, it means there was no face to detect.
Here, net is faceNet- this model is the DNN Face Detector and holds only about 2.7MB on disk.

  • Create a shallow copy of frame and get its height and width.
  • Create a blob from the shallow copy.
  • Set the input and make a forward pass to the network.
  • faceBoxes is an empty list now. for each value in 0 to 127, define the confidence (between 0 and 1). Wherever we find the confidence greater than the confidence threshold, which is 0.7, we get the x1, y1, x2, and y2 coordinates and append a list of those to faceBoxes.
  • Then, we put up rectangles on the image for each such list of coordinates and return two things: the shallow copy and the list of faceBoxes.

9. But if there are indeed faceBoxes, for each of those, we define the face, create a 4-dimensional blob from the image. In doing this, we scale it, resize it, and pass in the mean values.

10. We feed the input and give the network a forward pass to get the confidence of the two class. Whichever is higher, that is the gender of the person in the picture.

11. Then, we do the same thing for age.

12. We’ll add the gender and age texts to the resulting image and display it with imshow().

DO YOU KNOW – Data Scientists require a good knowledge of Python

What are you waiting for? Start learning Python Now!!

Python Project Examples for Gender and Age Detection

Let’s try this gender and age classifier out on some of our own images now.

We’ll get to the command prompt, run our script with the image option and specify an image to classify:

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In this python project, we implemented a CNN to detect gender and age from a single picture of a face. Did you finish the project with us? Try this on your own pictures. Check more cool projects in python with source code published by DataFlair.

If you enjoyed the above python project, do comment and let us know your thoughts.

Happy learning😊

30 Responses

  1. YUVAKUMAR R says:

    Hi Thanks for sharing the source code. I tried my web cam stream, though the gender is showing correctly, the age seems to be defaulting to 25-32 for any person. What could be the issue. Padding is set for 20 as recommended. Thanks

  2. arulfranklin says:

    Really awesome but images recognition is super but real time face recognition is not stable anyway this is the good source learn about open CV and CNN.

    Thank you for your KT.

    M.Arul franklin

  3. CHARANRAJ M.S says:

    how to view caffemodel file?
    how to train caffemodel file?

  4. Pattaye tujhe says:

    How to solve this line error
    print(f’Gender: {gender}’)

  5. aparna says:

    C:\Users\lenovo>c:\DataFlair\gad>py –image girl.jpg
    The system cannot find the path specified.


    how to solve this problem don’t do another step this type of errors

  6. Kiran Thakur says:

    Keep the image ‘girl.jpg’ where is a present directory.

  7. Charu Singh says:

    Sir, from where I get the code on phishing detection in Python

  8. ommay says:

    can anyone here who can help me in implementing this project its really important for me please.

  9. ommay says:

    anyone who can help me in implementing this project please.

  10. Bilal says:

    Great way to learn , Kudos to the team

  11. Erik says:

    I can’t replicate the results. For example woman1.jpg outputs male 38-43 years using the files in the zip and girl2.jpg outputs female age 15-20

  12. Abdul says:

    kijimbi$ python –image girl2.jpg
    Gender: Female
    Age: 4-6 years
    objc[64591]: Class RunLoopModeTracker is implemented in both /opt/anaconda3/lib/python3.7/site-packages/cv2/.dylibs/QtCore (0x107ae37f0) and /opt/anaconda3/lib/libQt5Core.5.9.7.dylib (0x124555a80). One of the two will be used. Which one is undefined.
    QObject::moveToThread: Current thread (0x7ffab8704b00) is not the object’s thread (0x7ffaba854c40).
    Cannot move to target thread (0x7ffab8704b00)

    You might be loading two sets of Qt binaries into the same process. Check that all plugins are compiled against the right Qt binaries. Export DYLD_PRINT_LIBRARIES=1 and check that only one set of binaries are being loaded.

    Could not load the Qt platform plugin “cocoa” in “” even though it was found.
    This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

    Available platform plugins are: cocoa, minimal, offscreen.

    Abort trap: 6

  13. msp says:

    how to train opencv_face_detector.proto

  14. AMAN JAIN says:

    thanking you sir for share the knowledge with us. sir can we do incremental training on your given model weights which is used for age and gender classification.


    Good work. Keep it up!

  16. lahari says:

    Thanks for sharing the knowledge…
    What are the algorithms used for feature extraction??
    How to view caffemodel file???

  17. saja says:

    thank u ..i run this python code..but i want to understand theoretically how these layer work to detect gender by caffemodel?

  18. Aditya says:

    how to make Caffe model??

  19. Shatha says:

    Can you explain to me what is the meaning for each column in the dataset such as what is X,Y ,dX,dY, etc?

  20. Hung says:

    I really like yor project.
    But how can I put images into a folder and gad still be able to detect it.

  21. Chanchal Agrawal says:

    Can you please help me to understand the data set ?

  22. Nguyễn văn Tiến says:

    admin, may I ask why there is no detailed code?

  23. Rahaf says:

    would you mind telling us how much accuracy you have got?

  24. Chathuranga says:

    Thank u for this. this work for me

  25. Ashish Upadhyay says:

    Can someone please tell me how to increase the age accuracy?

  26. Dushmanta says:

    How to close the imshow ,when we click on close.

  27. Nishikant Gurav says:

    please share the source code

  28. Renukaprasad M L says:

    Can you please share the source code of gender and age detection

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