Digital signage is a sub-segment of electronic signage. Digital displays use technologies such as LCD, LED, projection and e-paper to display digital images, video, web pages, weather data, restaurant menus, or text. They can be found in public spaces, transportation systems, museums, stadiums, retail stores, hotels, restaurants and corporate buildings etc., to provide wayfinding, exhibitions, marketing and outdoor advertising. They are used as a network of electronic displays that are centrally managed and individually addressable for the display of text, animated or video messages for advertising, information, entertainment and merchandising to targeted audiencesnteractive digital signage allows end users to interact with digital content via touchscreens, body sensors or QR codes via smartphones.Digital signs can interact with mobile phones using SMS messaging and Bluetooth. SMS can be used to post messages on the displays, while Bluetooth allows users to interact directly with what they see on screen. In addition to mobile interactivity, networks are also using technology that integrates social and location-based media interactivity. This technology enables end users to upload photos and messages to social networks as well as text messages.The widespread use of smartphones led to the development of screen–smart device interaction technologies. These allow smartphone users to interact directly with the digital signage screen, for example, participate in a poll, play a game, or share social network content. JPEG images and MPEG4 videos remain the dominant digital content formats for the digital signage industry. For interactive content, HTML5 and Unity3D are widely used due to their popularity among web developers and multimedia designers. Context-aware digital signage
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