Automotive Lighting Image Delta Transfer Under CAN Bandwidth Limits
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Solution Overview
Problem
Current automotive lighting systems face challenges in managing large amounts of data for adaptive lighting functionalities, particularly when dealing with moving images, which affects data transmission speed and bandwidth, especially when using the CAN protocol with limited bandwidth.
Innovation Solution
A method for managing image data by calculating and transmitting difference patterns between a control unit and a light module, involving steps like buffering, normalization, and compression to reduce data size, and utilizing a processor unit for decompression, allowing for efficient data transmission with lower bandwidth requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the CAN protocol bandwidth is limited, then the data transmission capacity is reduced, but the management operations requiring about 5 Mbps cannot be performed efficiently
Solution Approach 1:
The patent extracts only the essential information needed for lighting control by using difference patterns between consecutive images. Instead of transmitting complete high-resolution images, only the changes (differences) are transmitted, significantly reducing data volume while maintaining the ability to update lighting patterns efficiently.
Solution Approach 2:
The patent changes the parameter representation from complete image data to difference pattern data. By representing image changes as differential values rather than absolute values, the data transmission requirement is reduced to fit within limited CAN protocol bandwidth while preserving the necessary information for lighting control operations.
2Quantity of substance
If the data size is large, then the data transmission speed is reduced, but the image projection speed is affected
Solution Approach 1:
The patent extracts only the changing portions of image data by calculating difference patterns between consecutive frames. This extraction of essential changes rather than transmitting complete images reduces data size and enables faster transmission and projection updates.
Solution Approach 2:
The control unit pre-calculates difference patterns before transmission. By performing the differential calculation in advance at the control unit rather than at the lighting module, the patent prepares compressed data ready for immediate transmission, improving overall system responsiveness.
3Quantity of substance
If compression is applied to reduce data size, then transmission bandwidth is reduced, but the processing complexity increases
Solution Approach 1:
The patent uses difference pattern extraction as a form of compression that leverages the temporal redundancy in sequential images. Since consecutive lighting patterns often differ only slightly, transmitting only the differences provides significant compression with relatively simple calculation-based methods rather than complex compression algorithms.
Data Source
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AI summary
The invention provides a method for managing image data in an automotive lighting device (10). This method comprises the steps of providing a first image pattern (1), which is sent to a light module, and a second image pattern (2). A difference pattern (20) is generated by subtracting the second image pattern from the first image pattern and this difference pattern (20) is sent to the light module (4), so the light module (4) is able to reconstruct the second image pattern (2) from the data of the first image pattern (1) and the difference pattern (20). The invention also provides an automotive lighting device (10) for performing the steps of such a method.