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무엇인가
Imagen is a text-to-image model Google announced in May 2022. Its key move is to use a frozen large language model (T5-XXL) as the text encoder and to generate with cascaded diffusion: a base image at low resolution is produced first, then a series of super-resolution diffusion models enlarge it step by step. The paper showed that scaling the text encoder improved image–text alignment more than scaling the image generator alone. Imagen did not release its weights and was not offered directly to the public.
기억할 만한 이유
It showed that the size of the text encoder is a key lever for text–image alignment and pushed the cascaded-diffusion route to the frontier of photorealistic generation, shaping the design of later models.
주요 사양
- Text encoder
- Frozen T5-XXL
- Generation
- Cascaded diffusion (base + super-resolution)
- Output resolution
- 1024×1024
- Open weights
- No