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As a common image editing operation, image composition aims to cut the foreground from one image and paste it on another image, resulting in a composite image. However, there are many issues that could make the composite images unrealistic. These issues can be summarized as the inconsistency between foreground and background, which include appearance inconsistency (e.g., incompatible color and illumination) and geometry inconsistency (e.g., unreasonable size and location). Previous works on image composition target at one or more issues. Since each individual issue is a complicated problem, there are some research directions (e.g., image harmonization, object placement) which focus on only one issue. By putting all the efforts together, we can acquire realistic composite images. Sometimes, we expect the composite images to be not only realistic but also aesthetic, in which case aesthetic evaluation needs to be considered. In this survey, we summarize the datasets and methods for the above research directions. We also discuss the limitations and potential directions to facilitate the future research for image composition. Finally, as a double-edged sword, image composition may also have negative effect on our lives (e.g., fake news) and thus it is imperative to develop algorithms to fight against composite images. Datasets and codes for image composition are summarized at https://github.com/bcmi/Awesome-Image-Composition.
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