A Survey on Various Shadow Detection Methods

Shadows appear in many scenes. Shadows in images are typically affected by several phenomena in the scene, such as lighting conditions, type and behavior of shadowed surfaces, occluding objects etc. One of the core issues is to detect the shadow accurately. Accurate shadow detection can be difficult due to the illumination variations of the background and similarity between appearance of the objects and the background. There have been numerous researches done on shadow detection to address the challenges. Many algorithms and methods have been developed for different environmental conditions to detect shadow from the images. This paper reviews some methods to detect shadows and analyzes their correctness. This paper is aimed to provide a survey on various algorithms and methods of shadow detection with their comparative study and advantages and disadvantages. Keywords— Image Processing, Shadow, Shadow Detection, Detection Algorithm, Segmentation, Color Information.