Interaction between high resolution and high dynamic range in psychological effects of ultra-high-definition television

摘要

With the advent of the ultra-high-definition television (UHDTV) era, display resolutions and brightness of televisions have been augmented, and 4K and high dynamic range (HDR) videos are being publicly distributed. However, research on the psychological effects induced by these high-quality videos is still in its initial stages, and the video production methods that utilize these effects are still under investigation. Past studies have shown that expanding the dynamic range and improving the image resolution can enhance the impression of a video. In this study, we verified the effect of enhancing these impressions under the condition that the dynamic range and image resolution coexist in order to address the psychological effects of viewing UHDTV images. Four types of test images (2K/SDR, 2K/HDR, 4K/SDR, and 4K/HDR) were created for each of the six types of original images. Subsequently, subjective evaluation experiments were performed with a professional 4K monitor to measure the extent to which viewers sensed various impressions from the abovementioned images. Statistical analyses were conducted for the collected data, and it was found that high resolution and HDR were individually or collectively effective for enhancing a certain impression depending on the content. Furthermore, it was confirmed that the dynamic range and resolution had a synergistic effect. These findings can contribute toward more impressive video production and elucidation of the mechanisms influencing visual psychology.