Mitsuhiko Hanada

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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 in a part of the field induces motion in an adjoining region. In this study, it was investigated how the noise level affects induced motion of a counterphase flickering (target) grating due to adjacent drifting (inducer) gratings. It was shown that at low noise levels, motion contrast occurred, and at high noise levels, motion assimilation occurred.(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)
We examined human heading judgement from second-order motion which was generated by random-dots with the contrast polarity determined randomly on each frame. It was found that human observers can judge heading fairly accurately from second-order motion when pure translation is simulated or when self-motion toward a ground plane with gaze rotation is(More)
We investigated effects of roll (rotation around line of sight) and pitch (rotation around the horizontal axis) components of retinal flow on heading judgement from visual motion information. It was found that performance level of human observers for yaw (rotation around the vertical axis) plus pitch is little different from that for only yaw although there(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)
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)
On the basis of Hanada and Ejima’s (2000) model, an algorithmic model was presented to explain psychophysical data of van den Berg and Beintema (2000) that are inconsistent with vector-subtractive compensation for the rotational flow. The earlier model was modified in order not to use vector-subtractive compensation for the rotational flow. The proposed(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)
The retinal image of a figure on a slanted picture is narrower than that of a figure on a frontal picture. In this study, the perceived width of various figures (horizontal line segments, ellipses, faces, symbolic faces, and artistic pictures) on a slanted picture plane was measured. The width of the figures was magnified or reduced in order to vary the(More)