Abstract
Advanced Television Systems Committee (ATSC) 3.0 is a more innovative standardization including Ultra High Definition (UHD) broadcasting and mobile High-Definition (HD) broadcasting. It also includes the deployment of a disaster information alarm function as well as the adoption of All-Internet Protocol (IP) based transmission in terrestrial broadcasting networks. Thus, ATSC enables additional technologies such as hybrid broadcasting services by interworking terrestrial broadcasting and internet networks for bidirectional customized services. In addition, there is a growing interest in wider viewing contents, which provide more immersive contents than existing UHD broadcasting mediums. Wider viewing contents can be acquired by using large field of view (FoV) lenses such as fish-eye lenses or by stitching several sub-images. The images captured by large FoV lenses have heavily curved surface distortions, while the distortion of the stitching-based wider viewing contents caused by the synthesizing process on overlapping regions is lower. Provision of wider viewing contents over the traditional broadcasting service has limitations in terms of bandwidth. However, they can be overcome by using hybrid broadcasting platforms such as ATSC 3.0, which transmits a video sequence over an RF channel and other viewing-angle video sequences through the Internet network, where signalling among those video sequences is required. Therefore, this paper proposes a hybrid broadcasting platform for transmitting multiple video sequences over broadcasting and Internet networks, and stitching them for wider viewing.
Highlights
With the evolution of media compression and digital transmission technologies, the era of Ultra High Definition (UHD) broadcasting has begun, and this service provides more realistic media experiences than conventional HD broadcasting [1]
DVB-T2, which was first standardized for UHD service, has not been commercialized yet, but the terrestrial UHD based on Advanced Television Systems Committee (ATSC) 3.0 is being serviced in Korea
The stitching task consists of the matching system, which is conducted by the parallel triangle matching system based on minimum keypoint distance, and the blending system, which has been achieved by the robust weighted minimum error seam system for overcoming parallax of videos with multiple objects
Summary
With the evolution of media compression and digital transmission technologies, the era of UHD broadcasting has begun, and this service provides more realistic media experiences than conventional HD broadcasting [1]. This paper proposes for wider viewing video contents the hybrid ultra-wide viewing broadcasting platform, which supports signalling among video sequences from both broadcasting and Internet networks, and provides efficient Minimum Error Seam (MES) based video stitching algorithms to avoid parallax effects. In terms of the video blending function, the weighted MES method in this work consists of an HSV-based image difference module, a parallax adjustment module, and a seam consistency module. In order to provide a wider viewing content through a hybrid broadcasting platform, it is required to describe spatial location information for rendering multiple video sequences from broadcasting and broadband networks.
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