Light Field Dolly Zoom via 4D Coordinate Transformation
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Solution Overview
Problem
Existing techniques for creating a dolly zoom effect in image capture require accurate depth maps, limiting their robustness and applicability, especially in light field imaging where depth calculations are complex and not always feasible.
Innovation Solution
The dolly zoom effect is applied directly to light field data as a 4D transformation of coordinates, eliminating the need for explicit depth calculations and allowing for robust application across various light field scenarios, including light field displays, by skewing the light field along the uv plane with a perspective shift proportional to the st location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If depth maps are used to create dolly zoom effect, then the dolly zoom effect can be achieved, but the robustness and applicability are limited due to complex depth calculations
Solution Approach 1:
The patent extracts and eliminates the depth map requirement from the dolly zoom effect generation process. By working directly with light field data in 4D space without extracting depth information, the method removes the complex depth calculation step while preserving the essential dolly zoom effect, thereby improving robustness without the burden of depth map computation
Solution Approach 2:
The patent transitions from 3D depth map-based processing to 4D light field space processing. By operating in the additional dimension of light field data ( incorporating angular information), the method achieves dolly zoom effect through coordinate transformation in 4D space, avoiding the need for complex 3D depth calculations while maintaining effect fidelity
2Adaptability or versatility
If 2D reconstruction is performed to create dolly zoom effect, then the effect can be generated, but the applicability is limited to specific scenarios
Solution Approach 1:
The patent creates a universal method for generating dolly zoom effect that works across multiple light field scenarios without requiring scenario-specific processing. The 4D coordinate transformation approach is applicable to various light field capture configurations and display scenarios, making the method universally applicable while maintaining relatively simple processing requirements
Solution Approach 2:
Instead of reconstructing 2D images from light field data and then applying dolly zoom transformation, the patent inverts the approach by applying the dolly zoom transformation directly in 4D light field space before any 2D reconstruction or display. This inversion eliminates the need for intermediate 2D reconstruction steps, expanding applicability while reducing processing complexity
Data Source
AI summary
A sensor is configured to acquire a light field by imaging a scene. A processor is configured to determine four-dimensional (4D) coordinates of points in a light field and generate dollied coordinates from the 4D coordinates based on a dolly transform and a dolly parameter. The processor is also configured to project rays associated with the dollied coordinates from the light field onto corresponding points in an output raster. In some cases, the processor applies an aperture function to filter the rays in the coordinate system of the dollied coordinates. The aperture function has a first value in a first region of an aperture plane and the aperture value has a second value in a second region of the aperture plane. Rays passing through the first region are accepted by the aperture function and rays passing through the second region are rejected.