As display technology and devices advance, using any surface or space as a display screen is becoming possible. However, emerging technologies that employ projectors and see-through displays face challenges in maintaining consistent image quality, as the appearance of the displayed image can vary significantly depending on factors such as ambient light and background patterns. The key to solving this problem is understanding how the human visual system works. In this lecture, I will introduce an approach that addresses this issue by modeling the visual information processing of the human brain. Utilizing this model allows us to optimize displayed images to ensure they are perceived as intended despite environmental variations.