High Frame Rate Projection System for Stereoscopic 3D
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Solution Overview
Problem
The conventional 24 frames per second (fps) standard in motion picture photography and projection leads to loss of motion continuity, blurring, and strobing, especially in stereoscopic 3D imagery, due to the double-shuttering effect which results in a stroboscopic effect and limits the perceived motion and immersion.
Innovation Solution
Photographing and projecting at higher frame rates such as 60, 72, 120, or 144 fps, with alternating left and right eye frames to maintain temporal continuity and eliminate blurring and strobing, using digital technologies that allow for seamless image flow and retention of the 'Film Look' by replicating the camera shutter sequence in projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frame rate is increased to reduce blurring and improve motion continuity, then motion perception quality improves, but the 'Film Look' is lost and 'Video Look' or 'Soap Opera Effect' appears
Solution Approach 1:
The patent applies periodic action by implementing a rotating shutter mechanism in projection that periodically blocks light at specific phases. The shutter rotates to synchronize with the high frame rate content, creating periodic light blocking that mimics traditional film projection timing. This periodic action allows the projection system to display high frame rate content while maintaining the temporal characteristics associated with the Film Look, effectively bridging the gap between high speed display and traditional cinematic appearance.
2Object-affected harmful factors
If double-shuttering is used at 24 fps to reduce perceived flicker, then flicker is reduced, but motion continuity is lost and stroboscopic effect remains
Solution Approach 1:
The patent implements continuity of useful action by projecting each frame multiple times in sequence at high frame rates rather than using double-shuttering. This creates a continuous stream of progressively updated frames that maintain temporal coherence. The rotating shutter synchronizes with this continuous sequence, ensuring that each frame is displayed for the appropriate duration without interruption. This approach preserves motion continuity while eliminating flicker, as the high frame rate provides sufficient temporal sampling without the discontinuous double-shuttering effect.
3Manufacturing precision
If frame-to-frame image displacement is limited to avoid blurring and strobing, then motion quality improves, but screen size is limited due to angular displacement on fast action
Solution Approach 1:
The patent applies parameter changes by fundamentally altering the frame rate parameter from the traditional 24 fps to much higher rates (60, 72, 120, or 144 fps). This parameter change reduces the time interval between frames, thereby reducing the amount of motion that occurs during each exposure period. The result is that fast action can be displayed on large screens without objectionable blurring or strobing, as the high frame rate captures motion at sufficiently fine temporal intervals to maintain image quality across large viewing areas.
Data Source
AI summary
High-frame-rate stereoscopic projection using a single digital projector provides a powerful sense of immersion when shown on wide screens, and the human eye perceives each frame as unique and separate from the others by virtue of the natural left-right “shuttering” that occurs via the chosen 3D projection technology. Techniques are provided for the introduction of one or more consecutive “digital dark frames” into the image streams presented to the dual projectors in such a manner that the sequence of out-of-phase photography is replicated via out-of-phase projection. This is achieved by alternately introducing the dark frames so that the sequence of stereoscopic images is presented in proper temporal continuity.