Medical Control Device for Rolling Shutter Sensor Stripe Suppression
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Solution Overview
Problem
Medical observation systems using CMOS image sensors often experience stripe patterns due to exposure unevenness when the driving mode is changed, leading to suboptimal image quality.
Innovation Solution
A medical control device with a driving mode switch for rolling shutter type image sensors and a dimming controller that adjusts the light emitting element's current supply based on the driving mode to minimize exposure differences across image sensor lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driving mode of the image sensor is changed, then the exposure period and readout period are adjusted, but stripe patterns occur due to exposure unevenness
Solution Approach 1:
The patent changes the timing parameters of the light emitting element's light emission period based on the driving mode of the image sensor. By adjusting the light emission timing to coincide with the exposure period of each horizontal line, the system achieves uniform exposure across all pixels while maintaining high-speed capture capabilities, thereby eliminating stripe patterns without sacrificing productivity
Solution Approach 2:
The system dynamically adjusts the light emission control based on the selected driving mode (first driving mode with longer exposure or second driving mode with shorter exposure). The control unit modifies the light emission timing and duration according to the real-time driving mode, ensuring optimal image quality across different capture speed requirements
2Device complexity
If the light emitting element is controlled identically in all driving modes, then the control system remains simple, but exposure unevenness causes stripe patterns
Solution Approach 1:
The patent modifies the light emission parameters (timing and duration) based on driving mode without changing the fundamental control architecture. The control unit receives driving mode information and adjusts the light emission control signal accordingly, achieving variable control with minimal additional complexity while eliminating stripe patterns
Solution Approach 2:
The control unit uses feedback from the driving mode selection to automatically adjust the light emission timing. The system monitors which driving mode is active and相应地 adjusts the light emission period to match the exposure period, creating a closed-loop control that maintains image quality without complex manual intervention
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 effectively suppresses stripe patterns and enhances image quality by optimizing light emission according to different driving modes, ensuring consistent brightness and reduced luminance differences across the image.
Implementation Method 1
a light emitting element configured to emit light according to a supplied current
Implementation Method 2
a rolling shutter type image sensor in which a plurality of pixels are two-dimensionally arrayed in units of horizontal lines
Data Source
AI summary
A medical control device includes: a driving mode switch configured to switch a driving mode of a rolling shutter type image sensor in which a plurality of pixels are two-dimensionally arrayed in units of horizontal lines; and a dimming controller configured to control a light emitting element configured to emit light according to a supplied current, and switch control of the light emitting element according to the driving mode.