Endoscope Control Device Synchronizing Pulse Light with Vocal Cord Frequency
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Solution Overview
Problem
In endoscope systems used for observing vocal cords, the image brightness varies with vocal cord frequency due to the inverse proportionality of pulse-light emission time to vocal cord frequency, leading to inconsistent exposure and poor image quality.
Innovation Solution
A control device that includes a hardware processor and memory, which detects vocal cord vibration frequency and adjusts the pulse width and light emission cycle of the light source to synchronize with the vocal cord frequency, calculating a gain to multiply the image signal and maintain constant image brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the duty cycle is fixed and pulse-light emission time is inversely proportional to vocal cord frequency, then the light source can be synchronized with vocal cord vibration, but the exposure amount becomes small and image brightness decreases as frequency increases
Solution Approach 1:
The patent changes the duty cycle parameter dynamically based on vocal cord frequency. Instead of fixing the duty cycle, the system calculates an appropriate duty cycle value for each detected frequency, thereby adjusting the pulse-light emission time to maintain adequate exposure amount across different frequencies while preserving synchronization.
2Adaptability or versatility
If pulse light is emitted with any timing relative to reading timing, then the system is flexible in timing, but image quality cannot be maintained due to exposure variations
Solution Approach 1:
The system uses feedback from voice signal analysis to detect vocal cord frequency and adjusts the pulse-light emission timing and duty cycle accordingly. This closed-loop control ensures that the pulse light is emitted at the optimal timing relative to the reading timing for each specific frequency, maintaining image quality while allowing frequency adaptability.
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
The solution ensures consistent image brightness across varying vocal cord frequencies by synchronizing light emission with the vocal cord frequency and adjusting the image signal gain, thereby improving image quality.
Implementation Method 1
control an image sensor including a plurality of pixels arranged in a two-dimensional matrix to generate an image signal
Implementation Method 2
control a light source to emit pulse light using a pulse width and a light emission cycle
Data Source
AI summary
A control device includes: a hardware processor; and a memory, wherein the hardware processor is configured to: control an image sensor configured to generate an image signal by performing imaging sequentially according to predetermined frames; detect a frequency of vocal cord vibration of a subject based on a voice signal; set a pulse width and a light emission cycle for when a light source emits light, based on the frequency and a preset duty cycle; control the light source to emit the pulse light using the pulse width and the light emission cycle in one field period or one frame period of the image sensor in synchronization with the frequency; calculate, based on the light emission cycle or the frequency, a gain amount by which the image signal is to be multiplied; and multiply the image signal by the gain amount.