Mitsuhiko Hanada

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The effect of highlight and object colors on perception of glossiness was examined. Ten participants rated glossiness of object images. The color coordinates of objects and highlights were varied while luminance of each pixel was unchanged. Four colors were used for objects and highlights. Objects were perceived as glossier when the highlight color was(More)
The feeling of dazzling that is evoked by luminance gradients was examined. The stimulus consisted of a disk with uniform luminance surrounded by an annulus whose luminance was decreased from the inner boundary to the periphery. Three luminance profiles (linear, logistic, and inverse logistic) of a surrounding luminance ramp were used. The luminance of the(More)
We developed a new computational model of human heading judgement from retinal flow. The model uses two assumptions: a large number of sampling points in the flow field and a symmetric sampling region around the origin. The algorithm estimates self-rotation parameters by calculating statistics whose expectations correspond to the rotation parameters. After(More)
When we see a stimulus of a radial flow field (the target flow) overlapped with a lateral flow field or another radial flow field, the focus of expansion (FOE) of the target radial flow appears to be shifted in a direction. Royden and Conti [(2003). A model using MT-like motion-opponent operators explains an illusory transformation in the optic flow field.(More)
Motion perception in a region is affected by motion in the surround regions. When a physically static or flickering stimulus surrounded by moving stimuli appears to move in the direction opposite to that of the surround motion, it is referred to as motion contrast. When the centre appears to move in the same direction, it is referred to as motion(More)
How motion onset asynchrony (MOA) alters the effects of stimulus size on reaction time (RT) for direction discrimination of a drifting grating was examined. MOA is a delay from the stimulus onset to the onset of motion. Without MOA, RTs were found to increase as the stimulus size was increased at high contrast, but decrease with it at low contrast or at(More)
The sensation of being dazzled by light was investigated, and the effects of colors on the feeling were assessed using stimuli composed of a disk and a surrounding annulus with luminance gradient, which had a glowing appearance. The colors of the disk and annulus were varied, while the luminance of each pixel was unchanged. In addition, disk and maximum(More)