Formation of shadow when the extended light source is the same sixe as the object???
Answers
Answer: The closer an object is to the light source, the larger the shadow it casts. This is because an object closer to the source will block a larger area of the light, increasing its shadow size.
Explanation: hope u like it
A shadow is formed when light from a source is intercepted by an opaque body in such a way that the other side of the body not facing the source is in darkness. Projection of this dark region on a surface behind the object is known as a shadow region. the formation of shadow due to an extended source smaller than the object. The part of the shadow that is devoid of any light is called the umbra, and the region surrounding it, that is partially dark, is called the penumbra or the soft portion of the shadow . From another perspective, shadows can be categorized as static shadows or moving shadows . Static shadows are cast by static objects that usually form a part of the background; their elimination has never been judged as a crucial pre-processing step, as such shadows usually do not jeopardize the actual foreground object recognition process of surveillance systems. On the other hand, shadows cast by dynamic objects or by objects suddenly brought into a background scene are often misclassified as the actual foreground objects, leading to poor object segmentation and tracking . Hence, a foreground shadow region elimination process has become an unavoidable pre-processing step for the development and implementation of a robust and reliable real-time video surveillance system.