Controlling Temporal Aliasing in Cyclically Moving Objects
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image capturing systems struggle to control temporal aliasing effects in videos of cyclically moving objects, such as rotating wheels, due to impractical adjustments in camera sampling rates and object frequencies, which are typically industry-defined and operation-dependent.
Innovation Solution
An image capturing system that includes a control module to calculate and adjust the emission frequency of a light emitter, allowing for user-controlled influence of the stroboscopic effect without altering the camera's sampling rate or the object's frequency, using a sensor to detect the object's speed and calculate its rotational frequency, and a light emitter that pulses at a frequency synchronized with the object's rotation to manipulate the aliasing effect in captured videos.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sampling rate of the camera is adjusted to control temporal aliasing, then the temporal aliasing effect can be controlled, but the camera sampling rate is typically industry-defined and not practically adjustable in real-time
Solution Approach 1:
A light emitter is introduced as an intermediary device between the camera and the cyclically moving object. The light emitter pulses at a frequency synchronized with the object's rotation, effectively mediating the interaction between the camera's fixed sampling rate and the moving object, thereby controlling the temporal aliasing effect without requiring camera adjustment
Solution Approach 2:
Instead of changing the camera's sampling rate parameter, the invention changes the illumination parameter by pulsing the light emitter at a specific frequency. This parameter change in the lighting condition achieves control over the temporal aliasing effect while keeping the camera operating at its fixed sampling rate
2Ease of operation
If the frequency of the cyclically moving object is adjusted to control temporal aliasing, then the temporal aliasing effect can be controlled, but the object frequency is dictated by vehicle operation and not practically controllable
Solution Approach 1:
The light emitter serves as a mediator that decouples the control of temporal aliasing from the object's frequency. By pulsing the light at a frequency matched to the object's rotation (detected via sensor), the system achieves control over aliasing effects without requiring any change to the object's operational frequency
Solution Approach 2:
A sensor detects the cycling frequency of the moving object and provides feedback to the control module. The control module uses this feedback information to adjust the light emitter's pulse frequency, creating a closed-loop system that adapts to the object's frequency without requiring manual intervention or object frequency changes
3Ease of operation
If a light emitter is used to control temporal aliasing, then control over the stroboscopic effect is achieved, but the emission frequency must be precisely synchronized with the object's rotation frequency
Solution Approach 1:
The system employs a sensor to continuously monitor the cycling frequency of the moving object and feeds this information back to the control module. This feedback mechanism automatically adjusts the light emitter's pulse frequency to match the object's rotation, eliminating the need for manual frequency matching and reducing synchronization errors
Solution Approach 2:
The system is designed to automatically detect and adapt to the object's frequency without external intervention. The sensor and control module work together to self-regulate the light emitter's pulse frequency, making the system self-adjusting and reducing the precision burden on manual operation
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 precise control over the temporal aliasing effect in videos, allowing for the creation of desired motion appearances of cyclically moving objects, including stationary or animated displays, without interfering with the captured images and maintaining visual acceptability.
Implementation Method 1
this temporal aliasing effect which the Inventors wish to utilise to control display of a cyclically moving object in a video
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An image capturing system (100) introduces or controls an aliasing / stroboscopic effect in a cyclically moving object (150). The system (100) has a camera (102) with a sampling frequency (102a) to capture a series of images to form a video of the cyclically moving object (150) which cycles at a cycling frequency (150a), the sampling and cycling frequencies (102a, 150a) not necessarily being related. The image capturing system (100) includes a sensor (104) to detect the cycling frequency (150a) of the cyclically moving object (150) and to generate a frequency reading (104a) indicative of the detected cycling frequency (150a) with a control module (106) communicably coupled to the sensor (104). The system (100) has a light emitter (120) to emit pulses of light at a controllable emission frequency (120a), the control module (106) controlling the emission frequency (120a) of the light emitter (120) based on the frequency reading (104a), thereby to influence the temporal aliasing of the cyclically moving object (150) as captured in the video.