文部科学省科学研究費補助金 学術変革領域研究(A) 「実世界の奥深い質感情報の分析と生成」


栗木一郎さん(埼玉大学大学院、公募班 D02-1)がTU DelftのPerceptual Intelligence Lab (Pi-Lab) のセミナーで講演を行いました



栗木一郎さん(埼玉大学大学院、公募班 D02-1)が、TU DelftのPerceptual Intelligence Lab (Pi-Lab) のセミナーで講演を行いました。

日 時:2022年4月26日(火)18:00 ~19:15
場 所:オンライン Zoom
演 題:Color appearance mechanisms and its relation to perceived “reality” from colorization
概 要:
When monochrome photographs are colorized, everyone feels increased reality from the colorization. But when you add too much colorfulness to the image, it looks non-realistic; it rather looks like a miniature model. So, what defines the “appropriate” colorfulness for the reality? This is one of the key questions of our study. We perceive thousands of colors in everyday experience. How are these colors coded in human visual system? Human retina has three types of cone photoreceptors, and the differences of their responses code colors at the first stage. These difference signals had been considered the base of opponent color perception, but they are not. On the other hand, we categorize colors into just tens of groups, each of which corresponds to a color term, and we use color terms to talk about colors. However, we do not evaluate categorical differences when we evaluate subtle differences to argue the appropriateness of colorization. Then what mechanisms evaluate subtle color differences for the “reality” perception? I would like to introduce our studies on the cortical mechanisms of color appearance based on a series of fMRI and EEG studies, based on psychophysical knowledges. Our fMRI studies demonstrated that color representation in human brain is not coded by the cone opponent system (Kuriki et al., 2011) and showed the presence of neurons each of which is selective to hue (Kuriki et al., 2015). One of the EEG components called SSVEP (steady state visual evoked potential) enables us to tag brain responses evoked by stimulus flickering at the corresponding temporal frequency. By this technique, we measured brain responses that is probably reflecting our colorfulness perception (Kaneko et al., 2020). By the end of the talk, I would like to introduce an idea that connects the cortical mechanisms of color perception and the question “why colorization increases reality.”