Subject Reaction Measurement With Synchronized Screen And Sensor
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Solution Overview
Problem
Existing systems for measuring subject reactions to visual stimuli suffer from temporal uncertainty between stimulus display and image capture, affecting measurement accuracy and computational complexity.
Innovation Solution
A system with a screen and sensor synchronized by a logic unit and central clock, commanding pixel refresh and image capture at frequencies that are integer multiples of each other, ensuring precise temporal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If independent clocks are used for screen refresh and camera capture, then device complexity is reduced, but measurement precision deteriorates due to temporal uncertainty
Solution Approach 1:
The patent merges the previously independent clock functions into a single shared clock that controls both the screen refresh and camera capture operations. This consolidation eliminates temporal uncertainty by ensuring both operations are synchronized to the same time reference, directly resolving the contradiction between system complexity and measurement precision.
Solution Approach 2:
The shared clock acts as an intermediary mechanism that coordinates between the screen refresh operation and the camera capture operation. By introducing this common timing reference, the system achieves precise temporal alignment without requiring complex independent synchronization protocols, thus maintaining simplicity while improving measurement accuracy.
2Adaptability or versatility
If non-synchronized frequencies are used for screen and camera, then adaptability is improved, but measurement precision deteriorates
Solution Approach 1:
The patent maintains frequency flexibility by allowing the shared clock to operate at different frequencies while ensuring that both screen refresh and camera capture are synchronized to this single frequency source. This approach preserves adaptability for different testing conditions while eliminating temporal uncertainty, as both operations remain phase-coherent regardless of the specific frequency chosen.
3Ease of operation
If temporal uncertainty exists between stimulus display and image capture, then ease of operation is maintained, but productivity deteriorates due to increased computational complexity
Solution Approach 1:
The patent implements preliminary synchronization by using a shared clock to pre-coordinate the timing of screen refresh and camera capture operations before data acquisition begins. This preliminary timing alignment eliminates the need for complex post-processing temporal correlation calculations, thereby improving processing efficiency while maintaining operational simplicity.
Data Source
AI summary
The disclosure relates to a system for measuring reactions of a subject, comprising: a screen able to display a plurality of stimuli via a refresh of pixels of the screen, the stimuli being apt to generate reactions from the subject; at least one sensor able to capture images of the subject reacting to the stimuli; and a logic unit configured to command the refresh of the pixels of the screen at a first frequency and the capture of the images of the subject by the sensor at a second frequency, one of the frequencies being an integer multiple of the other frequency. The logic unit also comprises a central clock configured to command the refresh of pixels of the screen and the capture of the images. The disclosure also relates to a method for measuring reactions of a subject, to a computer program and to a computer-readable medium.