1. A method comprising: allocating points of two X-ray images of an item to a quantity of individual features of an object located within the item, wherein the quantity of individual features in each X-ray image has a proximity ratio and a suspect region is defined within the item as a region that includes the object; extracting each quantity of individual features to produce a set of extracted points for each X-ray image; identifying, in each set of extracted points, clusters that represent each quantity of individual features; determining a proximity ratio of each cluster using a proximity matrix H i,j =f(x i , y j ), wherein f represents evaluation function that displays high values when points are close and that displays low values when points are otherwise; determining a movement of the object by analyzing proximities of the clusters; and determining whether the movement of the object makes it possible to examine the object for risks just by examining the suspect region.