A Preference for Phase-Based Disparity in a Neuromorphic Implementation of the Binocular Energy Model
A Preference for Phase-Based Disparity in a Neuromorphic Implementation of the Binocular Energy Model
复制标题
双目能量模型的神经形态实现中对基于相位差异的偏好
作者：
Eric K. C. Tsang;Bertram E. Shi
物体的相对深度导致这些物体的左右视网膜位置的微小偏移，称为双眼视差。这封信描述了一个单一的双目调谐复杂的细胞的基础上的双目能量模型，这已被提出来模拟在哺乳动物的初级视觉皮层的复杂细胞的双调谐的电子实现。我们的系统包括两个硅视网膜代表左眼和右眼，两个硅芯片包含视网膜阵列的尖峰神经元与单眼的Gabor型空间感受野，和逻辑电路，联合收割机的尖峰输出计算的灵敏度选择性复杂的细胞反应。通过在单眼感受野轮廓之间引入位置或相移，可以电子地调节调谐视差。晶体管失配引起的单眼感受野轮廓之间的失配会降低神经元对不同视差的相对响应。在我们的系统中，相位编码调谐的神经元之间的相对响应比位置编码调谐的神经元更好地匹配。我们的数值敏感性分析表明，相位编码的神经元，最不敏感的感受野参数的相对响应变化最在我们的系统。我们推测，这种鲁棒性可能是生物神经系统中存在相位编码的连续性调谐神经元的原因之一。
The relative depth of objects causes small shifts in the left and right retinal positions of these objects, called binocular disparity. This letter describes an electronic implementation of a single binocularly tuned complex cell based on the binocular energy model, which has been proposed to model disparity-tuned complex cells in the mammalian primary visual cortex. Our system consists of two silicon retinas representing the left and right eyes, two silicon chips containing retinotopic arrays of spiking neurons with monocular Gabor-type spatial receptive fields, and logic circuits that combine the spike outputs to compute a disparity-selective complex cell response. The tuned disparity can be adjusted electronically by introducing either position or phase shifts between the monocular receptive field profiles. Mismatch between the monocular receptive field profiles caused by transistor mismatch can degrade the relative responses of neurons tuned to different disparities. In our system, the relative responses between neurons tuned by phase encoding are better matched than neurons tuned by position encoding. Our numerical sensitivity analysis indicates that the relative responses of phase-encoded neurons that are least sensitive to the receptive field parameters vary the most in our system. We conjecture that this robustness may be one reason for the existence of phase-encoded disparity-tuned neurons in biological neural systems.
影响因子：
56.9
作者：
OHZAWA, I;DEANGELIS, GC;FREEMAN, RD
通讯作者：
FREEMAN, RD
影响因子：
2.5
作者：
Anzai, A;Ohzawa, I;Freeman, RD
通讯作者：
Freeman, RD