Focal Plane Array Verification for Image Integrity Fault Detection
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Solution Overview
Problem
Imaging systems face challenges in verifying the integrity of image data, leading to potential errors such as false positives and failures in applications like autonomous vehicles, due to issues like stuck shutters and degraded detector responsivity, which can result in corrupted image data.
Innovation Solution
The implementation of a focal plane array (FPA) with a detector array and a readout circuit that performs integrity verification by using reference unit cells and shutter events, such as flat-field correction, to detect errors and provide diagnostic flags for mitigation actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a focal plane array with detector array and readout circuit is used to capture image data, then imaging capabilities are improved, but verification of image data integrity becomes difficult leading to potential errors
Solution Approach 1:
The patent applies preliminary action by incorporating reference unit cells into the focal plane array before actual imaging operations. These reference cells capture known radiation patterns (such as uniform flat-field radiation) in advance, establishing baseline data that can be used to verify the integrity of subsequently captured image data. This pre-established reference data enables detection of errors like stuck shutters and degraded detector responsivity.
Solution Approach 2:
The patent implements feedback mechanisms where the readout circuit continuously compares data from reference unit cells against expected reference values. When deviations are detected (indicating potential errors in the imaging system), the system generates diagnostic flags that trigger mitigation actions. This closed-loop feedback ensures ongoing verification of image data integrity throughout the imaging process.
2Reliability
If verification processes are implemented to detect errors in image data, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the verification functionality directly into the focal plane array structure by integrating reference unit cells among the regular detector cells and incorporating verification logic into the readout circuit. This consolidation eliminates the need for separate verification hardware systems, reducing overall device complexity while maintaining reliability improvements.
Solution Approach 2:
The readout circuit is designed with multi-functionality, serving both to read out image data from detector cells and to perform verification operations on reference unit cell data. This universal design allows a single circuit to handle multiple tasks (imaging and verification), reducing the need for dedicated verification hardware and thereby reducing device complexity.
3Measurement precision
If reference unit cells are added to perform verification, then measurement precision is improved, but manufacturing complexity increases
Solution Approach 1:
The focal plane array is segmented into two functional types of cells: regular detector cells for capturing image data and reference unit cells for verification. This segmentation allows the reference cells to be designed with specific characteristics (such as known radiation response) that simplify their manufacturing and testing, while the regular cells maintain standard imaging functionality. The modular nature of this segmentation facilitates streamlined fabrication processes.
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
This solution ensures the accuracy of image data by detecting and reporting errors, preventing false positives and failures, and allowing for timely mitigation actions to maintain image integrity in various applications.
Implementation Method 1
a detector array including a plurality of detectors, where each of the plurality of detectors is configured to detect electromagnetic radiation to obtain image data
Data Source
AI summary
Techniques for facilitating imager verification systems and methods are provided. In one example, an imaging device includes a focal plane array. The focal plane array includes a detector array including a plurality of detectors, where each of the plurality of detectors is configured to detect electromagnetic radiation to obtain image data. The focal plane array further includes a readout circuit configured to perform a readout to obtain the image data from each of the plurality of detectors. The imaging device further includes a processing circuit configured to perform a verification of the imaging device based at least on the image data. Related methods and systems are also provided.