Rotating Mask Video Compressive Sensing for Cost Reduction
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Solution Overview
Problem
High-speed video capture requires expensive cameras with high-speed coding, such as CCDs or CMOS transistors, or video compressive sensing (VCS) cameras using precise piezo translation or DMD arrays, which are costly and have limited capturing time.
Innovation Solution
A motion capturing device using a rotating mask instead of a fast-moving mask or DMD arrays, coupled with a motor to rotate the mask during capture, allowing for simplified reconstruction of high-speed videos at a low frame rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high speed motion cameras with CCDs or CMOS transistors are used, then high speed video capture is achieved, but the cost increases and capturing time is limited
Solution Approach 1:
A rotating mask is introduced as an intermediary component between the scene and the camera sensor. The mask modulates the optical signal by rotating at controlled speeds, enabling the capture of high-speed motion information through a standard low-frame-rate camera. This mediator transforms the problem from requiring a expensive high-speed camera to using a standard camera with optical modulation.
Solution Approach 2:
The patent replaces the mechanical/electronic high-speed coding system (CCDs or CMOS transistors operating at high frame rates) with a simpler mechanical rotating mask system. Instead of requiring the sensor itself to operate at high speeds, a mechanically rotating mask performs the high-speed modulation function, allowing standard sensors to capture high-speed content.
2Speed
If VCS cameras with precise piezo translation or DMD arrays are used, then high speed video reconstruction is achieved, but the cost increases
Solution Approach 1:
The patent extracts the high-speed coding function from complex electronic systems (piezo translation stages or DMD arrays) and implements it through a simpler mechanical rotating mask. By separating the modulation function from the sensor system and implementing it through independent mask rotation, the system achieves high-speed capability without the complexity of precise electronic control systems.
Solution Approach 2:
The rotating mask is a simple, inexpensive mechanical component compared to expensive piezo translation stages or DMD arrays. The mask can be a straightforward mechanical disc with patterns that rotates via simple motors, replacing costly electronic coding systems with a durable, low-cost mechanical solution.
3Speed
If fast moving masks or DMD arrays are used for modulation, then high speed video capture is achieved, but the capturing time window is limited
Solution Approach 1:
The rotating mask operates continuously throughout the capturing period, maintaining constant modulation of the optical signal. This continuous operation allows the system to capture high-speed content over extended time windows, unlike systems that require rapid repositioning or have limited operational duration due to mechanical constraints.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables cost-effective reconstruction of high-speed videos by rotating a mask during capture, reducing the need for expensive high-speed coding and extending capturing time, while maintaining video quality.
Implementation Method 1
a mask configured to rotate during capture of a scene by the motion capturing device and modulate the scene; and a motor coupled to the mask and configured to rotate the mask during the capturing of the scene
Data Source
AI summary
In an example embodiment, a motion capturing device includes a mask configured to rotate during capture of a scene by the motion capturing device and modulate the scene; and a motor coupled to the mask and configured to rotate the mask during the capturing of the scene.