Rolling Shutter Image Pickup System with Synchronized Strobe Control
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Solution Overview
Problem
Conventional image pickup systems using rolling shutters face challenges in capturing periodic motion objects, such as vocal cords, due to image quality deterioration from uneven brightness within frames during stroboscopic photographing.
Innovation Solution
An image pickup system that includes a light emitting section, an image pickup section with a rolling shutter, a period detection mechanism, and control units to synchronize stroboscopic light emissions with the object's motion, allowing light emission only during specific exposure periods to minimize brightness unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If stroboscopic light emission is performed to capture periodic motion objects, then motion freezing capability is improved, but image quality deteriorates due to brightness unevenness within frames
Solution Approach 1:
The system performs stroboscopic light emissions periodically synchronized with the object's motion period. The light emission control section generates light emission signals at specific phases within each period, creating periodic illumination that freezes the periodic motion at consistent positions across multiple frames, thereby achieving both motion freezing and uniform brightness.
Solution Approach 2:
The system detects the motion period of the object in advance and pre-calculates the optimal light emission timing based on the detected period. By determining the phase at which light emission should occur before capturing the image, the system ensures that the stroboscopic illumination occurs at the precise moment needed to freeze the motion uniformly across the rolling shutter exposure period.
2Device complexity
If rolling shutter system is used for image pickup, then device complexity is reduced, but brightness unevenness occurs within frames during stroboscopic photographing
Solution Approach 1:
The system uses a period detection section to detect the motion period of the object and feeds this information back to the light emission control section. Based on the detected period, the control section dynamically adjusts the light emission timing to occur at the optimal phase, ensuring uniform brightness across the frame while maintaining the simple rolling shutter structure.
Solution Approach 2:
The system changes the timing parameter of light emission based on the detected motion period. By adjusting when the stroboscopic light is emitted within each exposure period according to the object's motion characteristics, the system compensates for the rolling shutter's sequential exposure nature and achieves uniform brightness without modifying the basic rolling shutter mechanism.
3Ease of operation
If light emission timing is not synchronized with object motion, then operation simplicity is maintained, but image quality deteriorates with brightness unevenness
Solution Approach 1:
The system automatically detects the object's motion period and self-adjusts the light emission timing without requiring manual intervention. The period detection section and light emission control section work together to autonomously synchronize the stroboscopic illumination with the object's motion, maintaining operational simplicity while achieving high image quality through automatic adaptation to the object's characteristics.
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 system effectively suppresses image quality deterioration by controlling light emissions in sync with the object's motion, enabling clear, pseudo-stationary image capture of periodically vibrating objects like vocal cords.
Implementation Method 1
a light emitting section configured to emit light for illuminating an object which operates periodically
Implementation Method 2
an image pickup device that performs an image pickup operation by a rolling shutter system
Data Source
AI summary
An image pickup system includes a light emitting section that emits light for illuminating an object which operates periodically, an image pickup section including an image pickup device that performs an image pickup operation by a rolling shutter system, a period detection section that detects a period of motion of the object, a light emission signal generating section that outputs a stroboscopic light emission signal for causing the light emitting section to perform a stroboscopic light emission in synchronism with the period of the motion, a light emission period control section that sets as a light emission permission period, and a light emission non-permission period, and a light emission control section that performs control for causing the light emitting section to perform a light emission in the light emission permission period, and performs control for inhibiting a light emission of the light emitting section in the light emission non-permission period.