Figure 4From: The representation of visual depth perception based on the plenoptic function in the retina and its neural computation in visual cortex V1When the angle θ between the x-axis and z-axis is not the same as in the Cartesian coordinate system, the spatial relationships among these axes and visual perception are also different. (A) The included angle cos α = cos θ ‒ 90 ∘ = cos 3 0 ∘ = 3 / 2 = 0.866 , angle θ from 120° (a) to 90° (e). In case (e), there is no stereoscopic perception. (B) The included angle θ from 90° a to 120° e. In case a, there is no stereoscopic perception. (C) The included angle θ from 90° e to 120° a, obtained by rotating (A) 90° in the vertical direction and turned 30° in the horizontal direction. In case (e), there is no three-dimensional perception.Back to article page