Method and system for detection of contraband narcotics in human digestive tract

A non-transitory computer-readable medium containing computer code for automated detection of swallowed capsules, the computer code automatically implementing the following steps on a processor:

• (a) based on an incoming X-ray image of a person, generating a transformed image from the incoming image;
• (b) automatically identifying a stomach on the incoming X-ray image and on the transformed image;
• (c) identifying the swallowed capsules that have rotationally invariant features in areas of the stomach using periodic properties;
• (d) calculating aggregate features for areas on the incoming image containing the rotationally invariant features;
• and
• (e) based on a model for images that do not contain rotationally invariant objects, informing a user of the swallowed capsules if a dissimilarity function for the aggregate features is above a predetermined threshold.

A system for automated detection of swallowed capsules on X-ray scanner images comprising:

• an X-ray scanner;
• a processing unit connected to the X-ray scanner and configured to receive and process an X-ray image from the X-ray scanner;
• a monitor connected to the processing unit configured to display the X-ray image to an operator,
• wherein the processing unit automatically performs the following:
• (i) identifies a stomach on the X-ray image;
• (ii) identifies swallowed capsules that have rotationally invariant features in windows of the stomach using periodic properties;
• (iii) calculates aggregate features for the windows of the image containing the rotationally invariant features;
• (iv) informs the operator when capsules are detected in the stomach when a dissimilarity function based on the aggregate features is higher than a predetermined threshold.