Abstract
We propose SmartGrid, a new video-retargeting method that preserves a shape of the salient object and maintains a temporal coherence for the static background regions in the video. Previous methods mainly focus on preserving the shape of the salient object or maintaining the temporal coherence for each region. However, these methods do not explicitly adjust the sizes of the grids corresponding to the salient objects and the static background regions. Thus, they have difficulty in maintaining the consistency of the salient object shape and the temporal coherence for the static background regions. The basic idea of SmartGrid is to maintain the consistency of the contents in consecutive frames by analyzing the degree of the spatiotemporal consistency. Compared to the best results obtained using eight previous methods, SmartGrid achieved improvements of 1.19× in Bidirectional Similarity Measure, 7.59× in Jittery Metric 1, and 13.16× in Jittery Metric 2, and reduced the average computation time per pixel by 6.14×.
Highlights
Many mobile devices such as smartphones, tablets, and portable game consoles with different resolutions and aspect ratios are widely used
We propose SmartGrid, a new video retargeting method that generates optimal retargeted grids by minimizing the position differences of the corresponding grids in neighboring frames
EXPERIMENTAL RESULTS We conducted experiments to compare the quality of retargeting by SmartGrid and by previous methods
Summary
Many mobile devices such as smartphones, tablets, and portable game consoles with different resolutions and aspect ratios are widely used. With the advancement of mobile devices and display technologies, there is a growing need to reproduce video contents on a display platform with various aspect ratios. Sharing of video contents through mobile devices becomes popular. It is necessary to adjust the video contents to various display platforms. Video retargeting is a technique that adjusts the size of an image to the aspect ratio and resolution of an output device. Video retargeting can be used for devices with various display platforms such as televisions, tablets, personal computers, and smartphones. Movies generally have different aspect ratio that of device displays, so video retargeting is an essential process to adapt movies to various display platforms
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