1. A method for detecting an obstacle, the method comprising: identifying an object in a field by analyzing one or more images in color space; determining a vegetation height of a vegetation canopy at corresponding coordinates within the field; detecting an object height of the object to identify a screened object having an object height exceeding a vegetation height; estimating a range associated with the screened object with respect to a vehicle; estimating dimensions associated with the screened object; and establishing an obstacle avoidance zone for the vehicle based on the estimated range and dimensions.