Long Exposure Video for VR Headsets
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Virtual reality headsets lack the capability to effectively capture and display wide field of view video with moving elements, such as drones and fireworks, due to limitations in exposure time and field of view reduction, resulting in incomplete or blurred representations of dynamic scenes.
Innovation Solution
The implementation of long exposure video technology in conjunction with a head-mounted display, which uses a gimbal-mounted video camera and exposure generator to capture and transform wide field of view video into long exposure video frames, allowing for a wider field of view to be reduced and displayed in real-time, while accounting for head movement through sensors and panning adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If long exposure time is used to capture moving objects, then the paths of moving objects become visible, but stationary elements become blurred
Solution Approach 1:
The patent divides the video capture process into multiple segments: a first video captured during head movement with normal exposure, and a second video captured after head movement stabilizes with long exposure. This segmentation allows the system to capture moving object paths (second video) while preserving sharp stationary elements (first video), resolving the contradiction between visibility of moving paths and sharpness of stationary elements.
Solution Approach 2:
The system performs preliminary action by detecting head movement and triggering a first video capture before the long exposure second video capture. This preliminary capture of stationary elements during head movement prepares the system to later capture moving object paths with long exposure, ensuring both sharp stationary elements and visible moving paths are obtained in sequence.
2Area of stationary object
If wide field of view is used to capture dynamic scenes, then more of the scene is captured, but the display's limited field of view cannot show the entire captured area
Solution Approach 1:
The patent implements dynamic field of view reduction by adjusting the displayed field of view based on detected head movement. The system captures wide field of view video and dynamically reduces the displayed portion to match the head-mounted display's limited field of view while accounting for head position changes. This dynamic adjustment allows the system to capture extensive scenes with wide field of view cameras while adapting the displayed content to the display device's constraints.
3Manufacturing precision
If normal exposure time is used during head movement, then stationary elements remain sharp, but moving objects do not show their paths
Solution Approach 1:
The system employs periodic action by capturing video in distinct phases: first video captured during head movement with normal exposure time to maintain sharp stationary elements, followed by a second video captured after stabilization with long exposure time to reveal moving object paths. This periodic switching between normal and long exposure modes allows the system to achieve both sharp stationary elements and visible moving paths at different time intervals.
Data Source
AI summary
Methods and apparatus are disclosed for using long exposure video for virtual reality headsets. An example apparatus includes a video camera to capture first, real time video of a scene using a first field of view while operating using a first exposure time, the first exposure time corresponding to a normal exposure time of a human eye; a transformer to transform the first, real time video into a second video corresponding to a second exposure time, the second exposure time being at least twice as long as the first exposure time; and a display to display the second video at the second exposure time.