If you have extensively used social networking sites such as Meta (formerly Facebook) you will notice the remarkable ability of this social media site to apprehend the friend in your photograph. Previously, you had to type the name of your friends and select them to tag the photos but nowadays whenever you tag someone’s photo in Meta, the platform itself tags everybody like magic.
This technology is popularly known as Face Recognition technology. If you have tagged your friends a few times while uploading your photos, the algorithms of Meta can easily apprehend the faces of your friends. Meta can decipher the faces in photographs with an accuracy of 98 percent and that is why this technology is amazing.
In this article, we will get to know how modern face recognition technology works and what is the importance of deep learning or machine learning in this technology.
How machine learning can be used to understand a complex issue
We can use machine learning or deep learning technology to solve different but lonesome problems such as finding out if an image has a certain object, evaluating the value of a house, and generating new information based on the remaining data. In all of the above-mentioned cases, you will require only one machine learning algorithm, to gratify the data and receive the results.
On the other hand, face recognition practically is a series of related problems.
- First, we need to look at the picture and search for all the faces in it.
- Secondly, we need to concentrate on every face available in the picture and decipher if the person is the same (even if the face is affected by bad lighting or turned into a complicated direction).
- Now it is time to pick out the peculiar part of the face which makes it different from the others (for example, the length of the nose, the size of the ears, etc).
- Lastly, compare all these special features with the list of people you can already recognize to find out the person’s name.
Our brain is programmed to do all of these things instantly and automatically but computers do not have this high-level generalization capacity. This is the reason why we need to teach the machine how to complete the problem in a step-by-step method.
For computers or machines, we have to create a pipeline through which we can solve the face recognition problem with enough accuracy in each step and then pass the results on to the next step. To put it more simply, we will have to chain together multiple machine learning algorithms.
Modern face recognition with machine learning
Let us understand modern face recognition with the help of machine learning in a step-by-step process and also a little bit about the deep learning algorithms that are being used for the same.
First step: Searching for all faces
Face identification or Face detection is the first step of this entire process and we need to pinpoint all the faces in any picture or photo before we can separate them. Most cameras nowadays have the face detection feature and they can automatically focus on faces before we take a picture.
Face detection can be completed using a black and white photo where the machine will look very closely at the pixel. In this process, we will try to find out how dark the surrounding pixels are compared to a certain pixel and that is how we will place different gradients in them. This process is known as HOG.
Second step: Pose and Projection of the faces
In this step, we will use a deep learning algorithm named face landmark estimation to gather data from the images that are turned in different directions. The face landmark estimation algorithm creates 68 specific points in a face and makes it simple for machines to accurately measure the face data.
Third step: Encoding the faces
In the third step, we will try to find out the unique features of the machine such as measuring the spaces between the eyes, the distance between two ears, lengths of the nose, etc. This is a repeated process where the machine needs to collect data from thousands of images and become more accurate.
Fourth step: Searching for the name of the person from encoding
This is the fourth and last step where you just need to find the picture of the known people from an already existing database. This is the easiest and simplest step in the modern face recognition system.
Machine learning or deep learning has drastically changed a lot of technologies including the modern face recognition system. You can learn more about machine learning by enrolling in a professional course and creating a modern face recognition system by using deep learning algorithms on your own.
Reference links:
https://machinelearningmastery.com/introduction-to-deep-learning-for-face-recognition/
https://ieeexplore.ieee.org/document/8473066
https://iopscience.iop.org/article/10.1088/1742-6596/1755/1/012006/pdf