The relationship between absolute disparity and ocular vergence
The relationship between absolute disparity and ocular vergence
复制标题
绝对视差与眼聚散度的关系
DOI：
10.1007/bf00224855
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发表时间：
2004
影响因子：
1.9
通讯作者：
C. Erkelens
中科院分区：
文献类型：
--
作者：
Miro Pobuda;C. Erkelens
在闭环和开环观察条件下，视差和眼睛聚散度之间的关系进行了研究。首先，我们研究了聚散度是否类似于开环和闭环条件下提出的差距。在两种条件下观察到相似的反应。通过在开环观察条件下呈现0.2°和4°之间的恒定视差来检查视差和聚散度之间的直接关系。这种聚散度响应被描述为一阶低通滤波器的输出，对于每个视差幅度具有不同的滤波器特性。通过分析恒定视差引起的视向反应的潜伏期，并借助视向控制的视向反应的传递函数，估计了视向加工在视向回路中的时间延迟。我们建议时间延迟大约在80和120 ms之间，而不是通常假设的160 ms。视差变化率和聚散度之间的关系进行了检查，通过比较反应斜坡和逐步变化的目标聚散度。从类似的反应斜坡和阶梯变化的差距，我们得出结论，聚散度是不敏感的速度目标聚散度。基于这些发现，我们开发了一个模型的灵活性控制的聚散。在这个模型中的差异是通过几个平行的，不完美的积分器略有不同的低通滤波器的特性，他们每个人都容易受到一个有限范围的差异。该模型准确地模拟了对正弦视差的聚散度响应的增益和相位滞后。由于低通滤波器的工作范围有限，该模型正确地模拟了响应于目标聚散度的阶跃和斜坡的快相位和慢相位的改变，这是真实的聚散度响应的特征。
The relationship between disparity and ocular vergence was investigated under closed-loop as well as under open-loop viewing conditions. First we examined whether vergence responded similarly to disparity presented under open-loop and closed-loop conditions. Similar response were observed in both conditions. The direct relationship between disparity and vergence was examined by presenting constant disparities between 0.2° and 4° under open-loop viewing conditions. Such vergence responses are described as the outputs of first-order low-pass filters with different filter characteristics for each amplitude of disparity. By analyzing the latency of vergence responses induced by constant disparities with help of the transfer function of disparitycontrolled vergence, the time delay of disparity processing in the vergence loop was estimated. We suggested that the time delay was approximately between 80 and 120 ms instead of 160 ms as is generally assumed. The relationship between the rate of disparity change and vergence was examined by comparing responses to ramp and stepwise changes in target vergence. From the similar responses to ramp and staircase changes in disparity we concluded that vergence is not sensitive to the velocity of target vergence as such. On the basis of these findings we developed a model of disparity-controlled vergence. In this model disparity is processed through several parallel, imperfect integrators with slightly different low-pass filter characteristics, each of them susceptible to a limited range of disparities. Gains as well as phase lags of vergence responses to sinusoidal disparities are accurately simulated by this model. As a consequence of the limited working range of the low-pass filters, the model correctly simulates the alterations of fast and slow phases in response to step and ramps of target vergence, which are characteristic of real vergence responses.