Chen S, Bedell H E, Oğmen H
College of Optometry, University of Houston, TX 77204-6052, USA.
Vision Res. 1995 Aug;35(16):2315-28. doi: 10.1016/0042-6989(94)00308-9.
For exposure durations longer than about 40 msec, a field of dots in sampled motion has been reported to appear less smeared than predicted from the visual persistence of static displays. This reduction of perceived smear has been attributed to a motion "deblurring" mechanism. However, it has been long recognized that an isolated target moving continuously in a dark field appears to be extensively smeared. To reconcile these apparently contradictory observations, we investigated the effect of dot density on the extent of perceived smear for a single moving dot and for fields of dots with densities ranging from 0.75 to 7.5 dots/deg2. Bright targets were presented in continuous motion against a photopically illuminated background field. The results reconcile previous conflicting observations by showing that the length of perceived smear decreases systematically with dot density for exposure durations longer than about 50 msec. In three additional experiments, we arranged the spatial configuration of the targets to evaluate whether motion deblurring results primarily from a motion compensation mechanism (such as integration within the spatiotemporally oriented receptive fields of putative motion mechanisms) or from inhibition exerted by spatiotemporally adjacent targets. The results show that the activation of motion mechanisms is not a sufficient condition for motion deblurring and that the reduction of perceived smear requires the presence of spatiotemporally adjacent targets. Taken together, these findings suggest that motion deblurring results primarily from masking exerted by spatiotemporally proximal targets.
对于持续时间超过约40毫秒的曝光，据报道，采样运动中的点场看起来比静态显示的视觉暂留所预测的模糊程度更低。这种感知模糊的减少归因于一种运动“去模糊”机制。然而，长期以来人们都认识到，在暗场中连续移动的孤立目标看起来会有广泛的模糊。为了调和这些明显矛盾的观察结果，我们研究了点密度对单个移动点以及密度范围从0.75到7.5个点/度²的点场的感知模糊程度的影响。明亮的目标在明视觉照明的背景场上以连续运动的方式呈现。结果表明，对于持续时间超过约50毫秒的曝光，感知模糊的长度会随着点密度系统地减小，从而调和了先前相互矛盾的观察结果。在另外三个实验中，我们安排了目标的空间配置，以评估运动去模糊主要是由运动补偿机制（如在假定运动机制的时空定向感受野内的整合）还是由时空相邻目标施加的抑制引起的。结果表明，运动机制的激活不是运动去模糊的充分条件，并且感知模糊的减少需要时空相邻目标的存在。综上所述，这些发现表明运动去模糊主要是由时空近端目标施加的掩蔽作用导致的。
