11. The system of claim 8 , wherein the processor is further configured to select a second additional pixel patch from the query image for processing after a last classifier of the cascade has identified a second part, wherein the second additional pixel patch is selected based on a known positional relationship between the part, the second part and a third additional part of the complex object.
8. A system for identifying a complex-object in a query image, the system comprising: a processor configured to: process at least one pixel patch from the query image with a cascade of classifiers, each of the classifiers of the cascade configured to identify at least one discriminative feature characteristic of a part of the complex-object, wherein each successive classifier of the cascade uses a number of discriminative features greater than a number of the discriminative features used in prior classifiers of the cascade; and select an additional pixel patch from the query image for processing after a last classifier of the cascade has identified the distinguishing feature, wherein the selecting is based on a known positional relationship between the part and an additional part of the complex-object.