Region of Interest Switching for Vehicle Image Exposure Control

The patent divides the image into multiple evaluation areas (first evaluation area and second evaluation area) with different weights. The first evaluation area corresponds to the region of interest and is assigned a higher weight, while the second evaluation area covers the rest of the image and is assigned a lower weight. This segmentation allows independent evaluation of different regions, enabling the system to prioritize exposure accuracy for the region of interest while maintaining overall image brightness within acceptable ranges.

The patent implements dynamic switching between different evaluation modes based on environmental illuminance. When the illuminance is determined to be high (bright environment), the system switches to prioritizing the region of interest evaluation. When the illuminance is low (dark environment), the system switches to prioritizing the overall image evaluation. This dynamic adaptation allows the system to handle various lighting conditions effectively, improving both reliability and adaptability.

The patent introduces illuminance as a key parameter to trigger different evaluation modes. By monitoring environmental illuminance levels and comparing them against threshold values, the system dynamically adjusts the weight coefficients for different evaluation areas. This parameter-based approach enables the system to adapt to varying illumination conditions without requiring complex hardware modifications, thus expanding application scope while maintaining reasonable system complexity.