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Shadow Detection in an Image using Fuzzy based Approach

Shadows occur when objects totally or partially occlude direct light from a source of illumination. This method is based on Tri colour attenuation model (TAM)[20]. The proposed approach is based on shadow properties and exploits color information. Shadow is treated as a special kind of image degradation. Shadow region commonly has lower brightness than non-shadow region. Based on TAM a shadow detection algorithm is presented here. For the segmentation purpose a fuzzy c-means algorithm [14, 15, and 16] is adopted. Shadow edge detection is conducted based on the color constancy. They derive scene texture edges from an image and by subtracting those edges from the raw input; they obtain a shadow free color image This algorithm can be applied to real complex outdoor scenes to detect shadows without any prior knowledge. The experimental results are shown that this method achieve robustness and good segmentation accuracy.