Have you ever wondered how Snapchat accurately applies various filters on your face?
Is your smartphone performing magic when it unlocks using your facial features?
No, youre just watching Face Detection in action.
Face Detection is an Artificial Intelligence technology that can identify human faces in a digital image or video.
What Is the Haar Cascade?
These trained files are available in theOpenCV GitHub repository.
At each phase, the window stops and classifies if the area contains a face or not.
OpenCV, a computer vision tool, works with a pre-trained Haar Cascade model to classify the features.
Each phase checks five features: two edge features, two line features, and one four-rectangle feature.
you’re able to visualize these features in the below fashion.
Using these features and the computation of pixels, the algorithm identifies more than 100,000 data points.
you’ve got the option to then use an Adaboost algorithm to improve accuracy and discard irrelevant features.
However, the sliding window technique stops if a particular test case fails and its computationally expensive.
To solve this, you might apply the concept of the Cascade of Classifiers.
Instead of applying all the features in one single window, this approach groups and applies them in stages.
If the window fails the first stage, the process discards it, otherwise it continues.
Workflow of Face Detection
What Is OpenCV?
OpenCV is an open-source computer vision and machine learning library.
It has over 2,500 optimized algorithms for various applications.
These include face/object detection, recognition, classification, and many more.
Privacy of your facial datais a separate concern.
Hundreds of prominent companies such as Google, IBM, and Yahoo use OpenCV in their applications.
Some people who aim to keep their data private have demonstratedthere are ways to avoid facial recognition.
you might use it for face recognition in smartphones, homes, vehicles, and immigration checkpoints.
Facial detection is already common in CCTV surveillance, social media filters, and automatic face tracking in cinematography.
Its just the beginning of this wonderful technology.
