期刊
ACM TRANSACTIONS ON GRAPHICS
卷 32, 期 6, 页码 -出版社
ASSOC COMPUTING MACHINERY
DOI: 10.1145/2508363.2508419
关键词
Time hallucination; time-lapse videos
资金
- NSF [0964004, CGV-1111415]
- Div Of Information & Intelligent Systems
- Direct For Computer & Info Scie & Enginr [0964004] Funding Source: National Science Foundation
We introduce time hallucination: synthesizing a plausible image at a different time of day from an input image. This challenging task often requires dramatically altering the color appearance of the picture. In this paper, we introduce the first data-driven approach to automatically creating a plausible-looking photo that appears as though it were taken at a different time of day. The time of day is specified by a semantic time label, such as night. Our approach relies on a database of time-lapse videos of various scenes. These videos provide rich information about the variations in color appearance of a scene throughout the day. Our method transfers the color appearance from videos with a similar scene as the input photo. We propose a locally affine model learned from the video for the transfer, allowing our model to synthesize new color data while retaining image details. We show that this model can hallucinate a wide range of different times of day. The model generates a large sparse linear system, which can be solved by off-the-shelf solvers. We validate our methods by synthesizing transforming photos of various outdoor scenes to four times of interest: daytime, the golden hour, the blue hour, and nighttime.
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