ISP Fault Detection Through Overlapping Image Tile Comparison
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Solution Overview
Problem
Verifying hardware components in image processing systems, particularly in safety-critical applications like automotive systems, is challenging due to complexity and computational demands, making it difficult to robustly detect hardware errors in real-time.
Innovation Solution
A method involving dividing an image into overlapping tiles, processing each tile using an image signal processor (ISP), calculating and comparing characteristics of the overlapping portions, and using cyclic redundancy checks to detect faults, which reduces computational requirements and enables detection of hardware faults in the ISP and other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If robust verification of all hardware components is performed in real-time, then reliability is improved, but device complexity and computational demands increase significantly
Solution Approach 1:
The patent divides the image into multiple tiles with overlapping portions, processing each tile separately through the ISP and then comparing the overlapping regions. This segmentation approach allows verification of the ISP's processing consistency without requiring verification of all hardware components simultaneously, reducing overall system complexity while maintaining reliability.
Solution Approach 2:
The patent creates a copy of the image data by processing overlapping portions through the ISP and comparing the results. Instead of directly verifying all hardware components, the system copies the processing results from different ISP executions and compares them to detect faults, simplifying the verification process.
2Reliability
If comprehensive hardware verification is performed, then fault detection capability is improved, but computational requirements and processing time increase
Solution Approach 1:
By segmenting the image into tiles with overlapping portions and processing only these overlapping regions through the ISP, the patent reduces the computational workload compared to processing the entire image multiple times for verification. This maintains fault detection capability while improving processing speed.
Solution Approach 2:
The patent applies partial action by focusing verification only on the overlapping portions of image tiles rather than the entire image. This partial verification approach provides sufficient fault detection capability for the ISP while significantly reducing computational requirements and processing time.
3Productivity
If image processing is performed on overlapping portions only, then computational overhead is reduced, but verification coverage may be limited
Solution Approach 1:
The patent segments the image into multiple tiles where overlapping portions are processed and compared. This segmentation ensures that verification coverage is distributed across different regions, and by comparing overlapping portions, the system achieves both computational efficiency and comprehensive verification coverage through the overlapping region comparisons.
Data Source
AI summary
The disclosure relates to methods and systems for detecting faults in an image processing system, the image processing system comprising an image signal processor. An example method comprises: dividing an image into a first image tile and a second image tile, wherein the first image tile and the second image tile each comprise an overlapping portion of the image; processing the first image tile using the ISP to produce a first processed image tile comprising a first processed overlapping portion; processing the second image tile using the ISP to produce a second processed image tile comprising a second processed overlapping portion; calculating a characteristic of the first processed overlapping portion and calculating the same characteristic of the second processed overlapping portion; and comparing the characteristic of the first processed overlapping portion and the characteristic of the second processed overlapping portion.