Light field device, pixel rendering method therefor, and adjusted vision perception system and method using same
Described are various embodiments of a light field device, pixel rendering method therefor, and vision perception system and method using same. One embodiment describes a method to adjust user perception of an image portion to be rendered via a set of pixels and a corresponding array of light field shaping elements (LFSE), the method comprising: projecting an adjusted image ray trace between a given pixel and a user pupil location to intersect an adjusted image location for a given perceived image depth given a direction of a light field emanated by the given pixel based on a given LFSE intersected thereby; upon the adjusted image ray trace intersecting a given image portion associated with the given perceived image depth, associating with the given pixel an adjusted image portion value designated for the adjusted image location based on the intersection; and rendering for each given pixel the adjusted image portion value associated therewith.
1. A computer-implemented method, automatically implemented by one or more digital processors, to adjust user perception of an image portion to be rendered via a set of pixels and a corresponding array of light field shaping elements (LFSE), the computer-implemented method comprising, for each given pixel of at least some of the set of pixels, digitally:
projecting an adjusted image ray trace between said given pixel and a user pupil location to intersect an adjusted image location for a given perceived image depth given a direction of a light field emanated by said given pixel based on a given LFSE intersected thereby;
upon said adjusted image ray trace intersecting a given image portion associated with said given perceived image depth, associating with said given pixel an adjusted image portion value designated for said adjusted image location based on said intersection; and
rendering for each said given pixel said adjusted image portion value associated therewith, thereby perceptively rendering said adjusted image portion at said perceived image depth;
wherein the computer-implemented method is to adjust perception of distinct image portions, the computer-implemented method further comprising, upon said adjusted image ray trace failing to intersect said given image portion associated with said given perceived image depth, repeating said projecting and associating for a subsequent perceived image depth and adjusted image portion associated therewith, thereby rendering distinctly perceptively adjusted image portions perceptively rendered at respectively corresponding perceived image depths.
2. The computer-implemented method of claim 1 , wherein each of said image portions is digitally mapped to a corresponding virtual image plane virtually positioned relative to the pixels at said respectively corresponding perceived image depths, and wherein said intersection is defined on said corresponding virtual image plane.
3. The computer-implemented method of claim 1 , wherein each of said image portions is mapped to a user retinal plane in accordance with said given perceived image depth based on a user eye focus parameter, and wherein said intersection is defined on said retinal plane by redirecting said adjusted image ray trace at said pupil location in accordance with said user eye focus parameter.
4. The computer-implemented method of claim 1 , wherein said projecting and associating are implemented in parallel for each said given pixel of at least a subset of said pixels.
5. The computer-implemented method of claim 1 , wherein said distinct image portions are to be perceptively rendered side-by-side at said respectively corresponding perceived image depths.
6. The computer-implemented method of claim 5 , wherein said distinct image portions are to be perceptively rendered side-by-side at said respectively corresponding perceived image depths in a 2-dimensional grid or in respective image quadrants.
7. The computer-implemented method of claim 5 , wherein each of said image portions correspond to an optotype simultaneously rendered in each of said portions side-by-side at distinct perceived image depths to subjectively assess a user's reduced visual acuity.
8. The computer-implemented method of claim 1 , wherein overlap between said image portions are automatically addressed by rendering a nearest perceptive depth.
9. The computer-implemented method of claim 7 , wherein each of said respectively corresponding perceived image depths are dynamically varied so to subjectively assess the user's reduced visual acuity.
10. The computer-implemented method of claim 1 , further comprising, prior to said projecting:
calculating a vector between said given pixel and said user pupil location; and
approximating said direction of said light field emanated by said given pixel based on said given LFSE intersected by said vector.
11. A non-transitory computer-readable medium comprising digital instructions to be implemented by one or more digital processors to automatically adjust user perception of distinct image portions to be rendered on a digital display via a set of pixels thereof and an array of light field shaping elements (LFSE) disposed relative thereto, by, for each given pixel of at least some of the set of pixels, digitally:
digitally projecting an adjusted image ray trace between said given pixel and a user pupil location to intersect an adjusted image location for a given perceived image depth given a direction of a light field emanated by said given pixel based on a given LFESE intersected thereby;
upon said adjusted image ray trace intersecting a given image portion associated with said given perceived image depth, associating with said given pixel an adjusted image portion value designated for said adjusted image location based on said intersection to be rendered accordingly; and
otherwise repeating said projecting and associating for a subsequent perceived image depth and adjusted image portion associated therewith;
thereby rendering distinctly perceptively adjusted image portions perceptively rendered at respectively corresponding perceived image depths;
wherein said distinct image portions are to be perceptively rendered side-by-side at said respectively corresponding perceived image depths; and
wherein each of said image portions correspond to an optotype simultaneously rendered in each of said portions side-by-side at distinct perceived image depths to subjectively assess a user's reduced visual acuity.
12. The computer-readable medium of claim 11 , further comprising instructions for:
calculating a vector between said given pixel and said user pupil location; and
approximating said direction of said light field emanated by said given pixel based on said given LFSE intersected by said vector.
13. The computer-readable medium of claim 11 , wherein each of said image portions is digitally mapped to a corresponding virtual image plane virtually positioned relative to the digital display at said respectively corresponding perceived image depths, and wherein said intersection is defined on said corresponding virtual image plane.
14. The computer-readable medium of claim 11 , wherein each of said image portions is mapped to a user retinal plane in accordance with said given perceived image depth based on a user eye focus parameter, and wherein said intersection is defined on said retinal plane by redirecting said adjusted image ray trace at said pupil location in accordance with said user eye focus parameter.
15. The computer-readable medium of claim 11 , wherein overlap between said image portions are automatically addressed by rendering a nearest perceptive depth.