Dual-ISP Fault Detection Using Split Raw Image Comparison
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Solution Overview
Problem
Image signal processors (ISPs) in image processing systems can generate inaccurate images due to faults, leading to issues with advanced driver assistance systems (ADAS) functions, as the generated images may be unreliable.
Innovation Solution
A method is provided to transmit a raw image signal to multiple image signal processors (image processors) and to determine a fault in an image processing device, the method includes splitting a first image processing device, the method includes determining a blending a first partial raw image signal to a first common image and a second partial raw image signal to a second image processor, and determining a fault by comparing the first and second common images using a fault detection circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single ISP processes the raw image signal, then the device complexity is low, but the reliability is reduced due to potential faults causing inaccurate images
Solution Approach 1:
The patent divides the image signal processing task into multiple segments by splitting the raw image signal into first and second partial raw image signals, which are then processed by different ISPs (first ISP and second ISP) separately. This segmentation allows for fault detection through comparison while distributing the processing load across multiple processors.
Solution Approach 2:
The patent creates a redundant copy of the processing path by sending copies of the raw image signal to multiple ISPs. The first raw image signal is copied and distributed to both the first ISP and second ISP, enabling parallel processing and fault detection through comparison of the generated images.
2Reliability
If multiple ISPs process the raw image signal, then the reliability is improved through fault detection, but the device complexity increases
Solution Approach 1:
The patent introduces a split circuit as an intermediary component that receives the raw image signal and distributes it to multiple ISPs. This intermediary manages the signal routing and coordination between processors, simplifying the overall system architecture while enabling multiple processing paths for fault detection.
Solution Approach 2:
The patent implements a feedback mechanism where the images generated by multiple ISPs are compared to detect faults. The comparison result provides feedback about the reliability of each processor, enabling the system to identify and exclude faulty processors from further processing.
3Measurement precision
If the entire raw image signal is processed by each ISP, then the measurement precision for fault detection is high, but the loss of time due to redundant processing increases
Solution Approach 1:
The patent applies partial action by having ISPs process only specific portions of the image signal. The raw image signal is divided into first and second partial raw image signals that are processed by the first and second ISPs respectively, reducing redundant processing while maintaining fault detection capability through comparison of overlapping regions.
4Loss of time
If partial raw image signals are transmitted to different ISPs, then the loss of time is reduced through parallel processing, but the manufacturing precision of image splitting increases
Solution Approach 1:
The patent applies local quality by assigning different processing tasks to different ISPs based on their capabilities and the specific requirements of different image regions. The split circuit directs specific partial raw image signals to appropriate ISPs, optimizing processing efficiency while maintaining overall image quality through coordinated processing.
Data Source
AI summary
A method of determining an image signal processor (ISP) fault performed by an image processing device is disclosed. The method includes generating a first partial raw image signal and a second partial raw image such that a split circuit includes each blending region, generating, by a first ISP, a first partial image based on the first partial raw image signal, generating, by a second ISP, a second partial image based on a second partial raw image signal, and determining, based on the first partial image and the second partial image, whether a fault occurs in an ISP group including the first ISP and the second ISP.