The advancement of visual intelligence is intrinsically tethered to the availability of data. In parallel, generative Artificial Intelligence (AI) has unlocked the potential to create synthetic images that closely resemble real-world photographs, which prompts a compelling inquiry: how visual intelligence benefit from the advance of generative AI? This paper explores the innovative concept of harnessing these AI-generated images as a new data source, reshaping traditional model paradigms in visual intelligence. In contrast to real data, AI-generated data sources exhibit remarkable advantages, including unmatched abundance and scalability, the rapid generation of vast datasets, and the effortless simulation of edge cases. Built on the success of generative AI models, we examines the potential of their generated data in a range of applications, from training machine learning models to simulating scenarios for computational modelling, testing, and validation. We probe the technological foundations that support this groundbreaking use of generative AI, engaging in an in-depth discussion on the ethical, legal, and practical considerations that accompany this transformative paradigm shift. Through an exhaustive survey of current technologies and applications, this paper presents a comprehensive view of the synthetic era in visual intelligence. A project with this paper can be found at https://github.com/mwxely/AIGS .

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