Imaging Apparatus Saturation Correction for Peak Detection
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Solution Overview
Problem
Existing imaging apparatuses face challenges in capturing edges and peaks in bright environments while preventing the blackening phenomenon, where strong light saturation leads to uniform signal output levels, resulting in loss of luminance boundaries and peaks.
Innovation Solution
An imaging apparatus with a detection unit that identifies threshold-exceeding light emission signals, a correction unit that adjusts pixel luminance by adding a gain to the difference between post-exposure and reset output values, and a clustering unit that classifies signal outputs to maintain accurate luminance and detect peak positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the photodetector receives strong light (saturation level), then the luminance output is saturated, but the signal output level becomes zero (blackening phenomenon)
Solution Approach 1:
The patent applies preliminary action by performing a reset operation before the photodetector accumulates charge from incident light. The reset operation initializes the photodetector to a known state (zero charge), ensuring that subsequent signal measurements start from a clean baseline. This prevents residual charge from causing inaccurate readings and enables proper measurement even when strong light is incident during the exposure period.
Solution Approach 2:
The patent implements feedback through the use of a feedback capacitor connected between the photodetector and the reset operation. The feedback capacitor stores charge and provides feedback to the reset operation, enabling accurate measurement of the photodetector's charge accumulation. This feedback mechanism allows the system to compensate for charge leakage and maintain accurate signal output levels even under strong illumination conditions.
2Reliability
If the reset voltage is replaced by a predetermined value to prevent blackening, then the blackening phenomenon is prevented, but edge information and peak luminance cannot be acquired
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the reset voltage based on the feedback from the feedback capacitor rather than using a fixed predetermined value. The reset voltage is modified according to the actual charge accumulation state detected during the reset operation, allowing the system to maintain accurate signal output levels while preserving edge information and peak luminance data even when strong light is incident.
3Reliability
If multiple active pixel sensors are reset to prevent blackening, then the blackening phenomenon is prevented, but the device complexity increases
Solution Approach 1:
The patent applies merging by combining the reset operation and feedback capacitor into a single integrated circuit element. The feedback capacitor is connected directly to the photodetector and reset operation, allowing the system to prevent blackening through a unified mechanism rather than requiring separate complex reset circuits for each pixel. This integration reduces the overall device complexity while maintaining effective blackening prevention.
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 accurate capture of edges and peaks even in highly bright environments by correcting for saturation-induced output reductions and performing clustering to maintain luminance accuracy, preventing the blackening phenomenon.
Implementation Method 1
light emitted from a light emission part is received by using a photodetector such as a photodiode
Data Source
AI summary
An imaging apparatus includes: a light reception unit that receives a light emission signal from a transmission apparatus via a pixel; a detection unit that detects whether or not an output based on the light emission signal received by the light reception unit is a first threshold value or more; and a correction unit that corrects a luminance of the pixel when the output based on the light emission signal is the first threshold value or more based on a result detected by the detection unit.