This article comes from the WeChat personal public account “Cool Science” of Windows Knocking Rain, and the WeChat public account first published in the fruit shell.
Take a look at the photos below, can you find any mystery?
What these photos have in common is that they are all synthetic images made by AI, and the people in them have never really existed in this world. These pictures are from a website called “this person does not exist” (thispersondoesnotexist.com), and every time you click to refresh, a new synthetic portrait will be displayed. When we look closely, we can still find some unnatural details in the photos (for example, this lady in the lower right corner, the junction between her hair and the background is very delicate), but the reality of these portraits is indeed quite amazing.
The AI behind these photos is called StyleGAN, which comes from NVIDIA. This is a Generative Adversarial Networks. Simply put, it consists of two artificial neural networks: one is responsible for generating new synthetic images, and the other is based on real images to learn and judge the synthesis results look like ” “True” or “false”, and feedback the results to the image generation model.
(Synthetic portraits of different styles. Original video source: Tero Karras FI)
Prior to this, people have been training to generate adversarial networks for various image processing, and StyleGAN has improved the technology. It can not only get high-quality images that look more realistic, but also help people better control and understand the process of generating these images. In order to let the public understand this powerful technology, software engineer Phillip Wang specially established the above-mentioned website. Now, there is no need to run the program in person, just open the browser and swipe, anyone can appreciate these synthetic portrait photos with fake and real.
Of course, StyleGAN is also capable of processing other types of images, such as continuously synthesizing non-existent cat photos:
(Source: Tero Karras et al)
I think that this may be the really popular feature…