Method for inspecting luggage
View Patent ↗A method for determining a change in position of an item of luggage, examined by a first examination system, in order to thereafter examine only a suspect region of the item of luggage in a secondary examination system.
1. A method, comprising:
receiving from a first examination system a first image representing a position of an item of luggage in the first examination system;
receiving from the first examination system a first list of coordinates of the first image that define a first suspect region in the item of luggage;
taking, by a second examination system, a second image representing a position of the item of luggage in the second examination system;
comparing the first and second images;
determining a change in a position of the item of luggage in the second image relative to the first image using a first angle of rotation about a vertical axis, a second angle of rotation about a horizontal axis, and a translation;
determining a probability value for at least one of the first angle of rotation and the second angle of rotation;
converting, based on the change in the position of the item of luggage, the first list of coordinates into a second list of coordinates of the second image that define a second suspect region in the item of luggage, wherein the second suspect region corresponds to the first suspect region in the item of luggage; and
performing, using the second examination system, a targeted examination of the item of luggage only in an area thereof that corresponds to the coordinates of the second suspect region when the determined probability value(s) exceed a predetermined threshold.
2. The method of claim 1 , further comprising:
performing optical or geometrical pre-processing of the first transmission image or of the second transmission image before determining the change in position of the item of luggage.
3. The method of claim 1 , wherein the first examination system and the second examination system are spaced apart from each other.
4. The method of claim 1 , wherein each of the first image and the second image is a video image.
5. The method of claim 1 , wherein each of the first image and the second image is a transmission image obtained by means of X-ray radiation.
6. The method of claim 1 , wherein the first image is a video image and the second image is a transmission image obtained by means of X-ray radiation.
7. The method of claim 1 , wherein the second examination system utilizes magnetic resonance tomography.
8. The method of claim 1 , further comprising, before performing the step of comparing the first and second images:
extracting global features and/or local features from each of the first and second mages.
9. The method of claim 1 , further comprising:
resolving ambiguities by determining another first angle of rotation about the vertical axis and by determining another second angle of rotation about the horizontal axis.
10. The method of claim 1 , wherein the change in the position of the item of luggage is determined using local features, in particular, Random Sample Consensus, robust estimation, Hough transformation, or least-squares.
11. The method of claim 1 , wherein the step of comparing the first and second images further comprises:
performing a scale analysis.