An image reproducing method based on human characteristics has previously been reported (Kajitani & Watanabe, 2005, In Japanese). Another method was proposed to make clear how a reference stimulus located at the same distance and angle from a reference sphere affects the relative apparent size of objects (Kajitani, 2009, In Japanese). This research aims to make clear how the angular distance between a standard stimulus and a comparison stimulus affects the apparent relative size of an object. For this, the relative apparent size of two reference spheres and a target sphere are measured. From the experiment, it was clarified that the angular distance significantly correlated to the apparent size. Therefore, when reproducing images, we need to consider the sight distance and the angular distance between objects.
