Object detection involves detecting instances of objects from particular classes in an image or video. The goal of object detection is to detect all instances of objects from known classes, such as people, vehicles and other objects from real time videos.
It is a process of detecting and classifying objects from real-time scenarios in local environment. It includes detection of different objects like bag, bottle, laptop, person, and cell-phone etc. Typically, only a small number of instances of object are present in an image, but there is a very large number of possible locations and scales at which they can occur and that need to somehow be explored.