Enhancing road signs segmentation using photometric invariants
This work addresses illumination challenges in road sign detection for Intelligent Transport Systems, but it appears incremental as it builds on existing color-based methods.
The paper tackled road sign segmentation under varying illumination by proposing a method using photometric invariants in the l Theta Phi color space, achieving high performance as demonstrated in comparative experiments.
Road signs detection and recognition in natural scenes is one of the most important tasksin the design of Intelligent Transport Systems (ITS). However, illumination changes remain a major problem. In this paper, an efficient ap-proach of road signs segmentation based on photometric invariants is proposed. This method is based on color in-formation using a hybrid distance, by exploiting the chro-matic distance and the red and blue ratio, on l Theta Phi color space which is invariant to highlight, shading and shadow changes. A comparative study is performed to demonstrate the robustness of this approach over the most frequently used methods for road sign segmentation. The experimental results and the detailed analysis show the high performance of the algorithm described in this paper.