Abstract
We present a novel method to produce discernible image mosaics, with relatively large image tiles replaced by images drawn from a database, to resemble a target image. Compared to existing works on image mosaics, the novelty of our method is two-fold. Firstly, believing that the presence of visual edges in the final image mosaic strongly supports image perception, we develop an edge-aware photo retrieval scheme which emphasizes the preservation of visual edges in the target image. Secondly, unlike most previous works which apply a pre-determined partition to an input image, our image mosaics are composed of adaptive tiles, whose sizes are determined based on the available images in the database and the objective of maximizing resemblance to the target image. We show discernible image mosaics obtained by our method, using image collections of only moderate size. To evaluate our method, we conducted a user study to validate that the image mosaics generated present both globally and locally appropriate visual impressions to the human observers. Visual comparisons with existing techniques demonstrate the superiority of our method in terms of mosaic quality and perceptibility.
Highlights
An image mosaic or photographic mosaic [1, 2] is a picture that is divided into usually uniformly sized tiles, each of which is replacedManuscript received: 2018-12-09; accepted: 2019-01-20 by another photo, so that the entire mosaic resembles a target photo
We present a novel method to produce discernible image mosaics which resemble a target photo, using relatively large image tiles replaced by photos drawn from a database
Our method produces image mosaics reasonably quickly, in general, taking less than 3 min to prepare a single row of an image mosaic
Summary
An image mosaic or photographic mosaic [1, 2] is a picture (usually a photograph) that is divided into usually uniformly sized tiles, each of which is replacedManuscript received: 2018-12-09; accepted: 2019-01-20 by another photo, so that the entire mosaic resembles a target photo. As an art form, image mosaics have widely appeared in advertising, decoration, and entertainment. Results from such a “pictures in a picture” composition paradigm should provide both global and local visual impressions. When viewed afar or with purposely blurred vision, the mosaic should resemble the target photo in color and texture. The main challenge is that with larger tiles, close resemblance between the small photos and the target photo is harder to achieve and their visual differences are more apparent
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