HUD Circuit Device Error Detection Mapping
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Solution Overview
Problem
Head up display controllers face challenges in confirming whether mapping processing for non-planar surfaces is properly performed, as existing techniques lack methods for verifying the accuracy of mapping processing and detecting errors in the displayed image.
Innovation Solution
A circuit device incorporating an image processing circuit for first and second mapping processing, and a comparison circuit to detect errors by comparing the original and reverse-mapped images, providing an index representing the degree of matching between them, and an error detection circuit to determine operational modes based on the comparison results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mapping processing is performed to project images on non-planar surfaces, then the image can be displayed on curved surfaces like windshields, but there is no method to verify whether the mapping processing is properly performed
Solution Approach 1:
The patent applies reverse mapping processing to convert the mapped image back to the original image coordinates. By comparing the original image with the reverse-mapped image, the system can verify whether the forward mapping processing was performed correctly. This inversion technique allows validation of mapping accuracy without requiring additional hardware or complex verification procedures.
2Reliability
If reverse mapping processing is added to verify mapping accuracy, then error detection capability is improved, but device complexity increases
Solution Approach 1:
The mapping processing circuit is designed to perform multiple functions: forward mapping for image projection and reverse mapping for error verification. By making the circuit multi-functional, the patent avoids adding separate verification hardware, thus improving reliability without significantly increasing device complexity. The same processing unit is utilized for both mapping and verification purposes.
Solution Approach 2:
The comparison function is integrated into the mapping processing circuit itself. The circuit combines the mapping processing, reverse mapping, and image comparison operations into a unified structure, reducing the need for separate verification components and minimizing the increase in device complexity while maintaining error detection capability.
3Measurement precision
If detailed comparison of pixel values is performed, then measurement precision of mapping accuracy is improved, but processing time increases
Solution Approach 1:
The patent performs detailed pixel value comparison only in regions where mapping errors are most likely to occur or where visual accuracy is most critical. By applying partial action selectively rather than uniformly across the entire image, the system achieves high measurement precision in critical areas while minimizing the overall processing time and computational burden.
Data Source
AI summary
Provided is a circuit device that can appropriately detect an error in a display image in a head up display, an electronic apparatus, an error detection method, and the like. The circuit device includes an image processing circuit and a comparison circuit. The image processing circuit performs first mapping processing, which maps an input first image on a second image to be projected onto a projection target object, and second mapping processing, which converts the second image to a third image. The second mapping processing is reverse mapping processing of the first mapping processing. The comparison circuit performs comparison between the first image and the third image, and outputs the result of comparison as information for performing error detection on the second image.