Vehicle Lighting Pixel Selection for CAN-FD Bandwidth Limits
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Solution Overview
Problem
Current vehicle lighting systems face challenges in transmitting high-definition image data due to limited bandwidth in CAN-FD networks, which affects the display quality of lighting functions like adaptive driving beams and road writing, as existing compression methods do not adequately reduce bandwidth requirements without degrading image quality.
Innovation Solution
A method for managing image data in vehicle lighting systems involves calculating gradient values and determining significant points of inflection to dynamically compress pixel data, with adjustable thresholds for intensity and spatial differences based on photometry and lighting functions, allowing for high compression rates while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-definition image data is transmitted over CAN-FD network, then lighting function display quality is improved, but bandwidth consumption increases beyond network capacity
Solution Approach 1:
The patent extracts and transmits only the essential pixel data required for lighting functions, separating critical information from redundant data. By identifying and transmitting only necessary pixel values rather than complete high-definition images, the system achieves adequate lighting display quality while dramatically reducing bandwidth consumption to fit within CAN-FD network constraints.
Solution Approach 2:
The patent applies different data transmission quality levels to different regions of the lighting display. Critical areas requiring high precision (such as road writing and adaptive driving beam boundaries) receive full or near-full resolution data, while less critical areas use compressed or lower-resolution data. This localized quality approach maintains essential lighting function performance while reducing overall bandwidth requirements.
2Quantity of substance
If data compression is applied to reduce bandwidth consumption, then bandwidth usage is optimized, but image quality deteriorates
Solution Approach 1:
The patent implements dynamic compression strategies that adapt to different lighting function requirements and network conditions. Compression ratios and algorithms are adjusted in real-time based on the specific lighting function being executed (e.g., adaptive driving beams, road writing, welcome scenarios), ensuring optimal balance between bandwidth efficiency and display quality for each functional context.
Solution Approach 2:
The patent changes key parameters of the image data representation to reduce bandwidth while preserving quality. This includes converting absolute pixel values to differential values, using variable-length encoding for pixel intensities, and selectively transmitting only pixels that change state. These parameter transformations maintain the essential visual information while significantly reducing data transmission requirements.
3Adaptability or versatility
If multiple light sources are used to achieve high-definition light beams, then lighting functionality is improved, but system complexity increases
Solution Approach 1:
The patent merges the control of multiple light sources under a unified data transmission and processing architecture. Rather than independently managing each light source, the system transmits processed pixel data that can be distributed to multiple LEDs or LED modules, which then cooperate to form the complete lighting function image. This consolidation reduces control complexity while maintaining the capability to drive multiple light sources for high-definition displays.
Data Source
AI summary
The invention relates to a method for managing image data in a motor vehicle lighting system. The lighting system comprises at least one lighting module intended to project light beams generated on the basis of data relating to the selection of at least one image, each image being defined by a matrix containing a plurality of horizontal or vertical rows of pixels, wherein each pixel is characterized by a numerical value related to a light intensity of the pixel, said method determining whether the analyzed pixel is regarded as a significant inflection point of the image such that said analyzed pixel is transmitted to at least one lighting module so that same can project a resulting image. The invention also relates to a motor vehicle lighting system for carrying out the steps of a method of this kind.