Imaging Device Dynamic Exposure Control
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Solution Overview
Problem
Existing imaging devices require complex configurations and external equipment to achieve effects similar to slow synchronous imaging, which complicates the expression of moving subjects in the visual field.
Innovation Solution
An imaging device that divides the imaging period into multiple periods for exposure, using a photoelectric conversion unit and a control unit to adjust the accumulation time of signal charge, allowing for the expression of moving subjects with a simple configuration without the need for a stroboscope or additional imaging elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slow synchronous imaging with stroboscope is used, then subject trajectory and moving direction can be expressed, but device complexity increases due to requiring stroboscope and synchronized control
Solution Approach 1:
The imaging period is divided into multiple exposure periods with different accumulation times. The photoelectric conversion unit performs sequential exposures at different durations within one imaging cycle, eliminating the need for external stroboscope equipment while achieving motion trajectory capture.
Solution Approach 2:
Multiple exposure periods with different accumulation times are merged into a single imaging period. The image synthesizing unit combines images from these different exposure periods to produce a final image showing both subject details and motion trajectory, integrating functions that previously required separate devices.
2Adaptability or versatility
If multiple imaging elements with different exposure times are used, then motion blur and subject details can be captured simultaneously, but device complexity and size increase
Solution Approach 1:
Instead of using multiple static imaging elements with fixed exposure times, the patent employs a single photoelectric conversion unit that dynamically changes its accumulation time across different exposure periods. This dynamic adjustment allows one element to perform the work of multiple elements with different fixed characteristics.
Solution Approach 2:
The photoelectric conversion unit serves multiple functions by varying its accumulation time across different exposure periods within a single imaging period. It can capture short-exposure subject details and long-exposure motion trajectories sequentially, making a single element universal enough to replace multiple specialized elements.
3Reliability
If spectroscopic unit and image synthesizing unit are added, then slow synchronous imaging effect can be achieved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential function of differential exposure from the complex slow synchronous imaging system. By removing the spectroscopic unit and external stroboscope, it retains the core capability of capturing motion trajectory and subject details through temporal division of exposure periods within a single imaging cycle.
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 the expression of subject details, trajectory, and moving direction with reduced image quality deterioration and device size, achieving effects similar to slow synchronous imaging without the complexity of traditional methods.
Implementation Method 1
an imaging element having a photoelectric conversion unit that generates signal charge
Data Source
AI summary
Provided is an imaging device in which a subject moving within a visual field can be freely expressed with a simple configuration. This imaging device is an imaging device which acquires an image by dividing one imaging period into a plurality of periods for exposure to add for each pixel, and includes an imaging element which includes a photoelectric conversion unit configured to generate a signal charge, and a control unit configured to control an accumulation time of the signal charge generated in the photoelectric conversion unit. The control unit changes the accumulation time in each period obtained by dividing the one imaging period.