基于同态滤波与圆孔定位的禁令标志检测

Prohibitory Sign Detection Based on Homomorphic Filtering and Circular Hole Detection

基于禁令标志的颜色相对固定,亮度易受光照影响的特点,提出一种基于同态滤波光照抑制的禁令标志检测算法。把图片从RGB空间转换到HSI空间,利用同态滤波对亮度分量进行光照抑制;转换到RGB空间,基于颜色分量的差值提取图片中红色分量,利用形态学和提取红色圆孔的方式定位禁令交通标志。实验结果表明,该方法可以在光照不佳、背景复杂、标志相连、轻度遮挡的环境下准确定位禁令标志,具有鲁棒性好,检测率高的优点。

Aiming at the feature that prohibitory sign’ s color is relatively steadfast,but the brightness is easily affected by light conditions,a new prohibitory sign detection algorithm is proposed. Firstly the traffic sign image is transformed from RGB space to HSI space,using the homomorphic filtering to suppress brightness. Then based on extracting the red component of the image based on color components differences in RGB space. The experimental results show that the method can accurate positioning of the prohibitory signs in poor light,complex background,sign connected and slight shade,with good robustness and high detection rate.