Automatic detection method for time emergence of seedling of corns

The invention provides an automatic detection method for the time emergence of seedling of corns. The method comprises the following steps of: automatically dividing an acquired front down-looking image of the corns in a field, extracting corn seedlings, and judging whether the corns in an image area enter the time emergence of seedling or not by utilizing the spatial distribution and number information of the seedlings. According to the method, the growth period of the corns is judged in real time by taking an image characteristic parameter representing the spatial distribution in the seedling emergence of the corns as a judgment basis, so that the method is high in detection result accuracy, and has guiding significance for analysis on a relationship between the growth period of the corns and weather conditions, the identification of agricultural weather conditions for the growth of the corns and farming activities for the corns.