The complete or partial obstruction of light by an opaque object forms a shadow. It is an undesirable effect, as it not only degrades the image quality but also limits the information conveyed by that image. Thus for correct interpretation of the image, shadow detection and removal becomes a necessary step in image processing. Many works have been carried out in this field which can successfully detect and remove the shadow from an image, for example gamma correction, histogram matching, correlation techniques etc but it is still a challenging task to do the same automatically. This paper presents a full automatic gamma correction technique to eliminate the shadow from an image.
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