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We study the problem of region-semantics preserving (RSP) image synthesis. Given a reference image and a region specification R, our goal is to train a model that is able to generate realistic and diverse images, each preserving the same semantics as that of the reference image within the region R. This problem is challenging because the model needs to (1) understand and preserve the marginal semantics of the reference region; i.e., the semantics excluding that of any subregion; and (2) maintain the compatibility of any synthesized region with the marginal semantics of the reference region. In this paper, we propose a novel model, called the fast region-semantics preserver (Fast-RSPer), for the RSP image synthesis problem. The Fast-RSPer uses a pre-trained GAN generator and a pre-trained deep feature extractor to generate images without undergoing a dedicated training phase. This makes it particularly useful for the interactive applications. We conduct extensive experiments using the real-world datasets and the results show that Fast-PSPer can synthesize realistic, diverse RSP images efficiently.
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