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Fast style transfer methods have recently gained popularity in art-related applications as they make a generalized real-time stylization of images practicable.
However, they are mostly limited to one-shot stylizations concerning the interactive adjustment of style elements.
In particular, the expressive control over stroke sizes or stroke orientations remains an open challenge.
To this end, we propose a novel stroke-adjustable fast style transfer network that enables simultaneous control over the stroke size and intensity, and allows a wider range of expressive editing than current approaches by utilizing the scale-variance of convolutional neural networks.
Furthermore, we introduce a network-agnostic approach for style-element editing by applying reversible input transformations that can adjust strokes in the stylized output. At this, stroke orientations can be adjusted, and warping-based effects can be applied to stylistic elements, such as swirls or waves.
To demonstrate the real-world applicability of our approach, we present StyleTune, a mobile app for interactive editing of neural style transfers at multiple levels of control. Our app allows stroke adjustments on a global and local level.
It furthermore implements an on-device patch-based upsampling step that enables users to achieve results with high output fidelity and resolutions of more than 20 megapixels.
Our approach allows users to art-direct their creations and achieve results that are not possible with current style transfer applications.