Effects of Size Changes of Main Subjects on Subjective Evaluations of Video Contents and its Main Subjects

Abstract

This paper reveals effects of changes in captured size of main subject of content on subjective evaluation of content and main subject. Due to the recent explosion of video contents and diversification of video capturing and rendering methods, research on subjective evaluation is acknowledged as a quite important. Recently, Chu et al. examined the effect of image size on subjective aesthetic evaluation of an image. We address our study as an extension of Chu et al.'s work to temporal domain. In other words, our target is the size change, i.e., zoom-in/zoom-out. In our daily watching of video contents, both zoom-in and zoom-out are used frequently. To reveal the effects, we generate video contents with three variations; without zoom change, short cycle zoom change, and long cycle zoom change. Experimental evaluation employing 16 people shows that long-term changes in size of main subject improve the subjective perception of both contents and main subject.