Amazon patents cart cameras that ignore personal items

1. A method to detect non-product items in a shopping cart of a store, comprising: receiving a first sequence of images of an item in response to an event during a session associated with a user identifier, the first sequence of images being generated by sensors of the shopping cart, wherein a virtual cart is generated in associated with the session; determining a registration status associated with the user identifier; based on determining that a personal item is registered in association with the user identifier, determining whether the first sequence of images matches a second sequence of images of a registered non-product item, wherein the determining comprises: accessing the second sequence of images of the registered non-product item; determining similarity of the first sequence of images to the second sequence of images, wherein the similarity is based on generating respective similarity scores for each respective image in the first sequence of images and respective features for each of the images in the second sequence of images; determining, based on the respective similarity scores, that the first sequence of images matches the registered non-product item; and storing an indication that the item matches the registered non-product item; based on determining that the personal item is not registered in association with the user identifier, determining, whether the item matches a non-product category of a group of non-product categories for the store, wherein the determining comprises: retrieving the group of non-product categories of the non-product items; determining, for each of the non-product categories, a respective matching image of the first sequence of images of the item, wherein the determining generates respective scores for each of the images in the first sequence of images and the respective non-product categories; and determining, based on the respective scores, that the item matches one of the non-product categories; and performing, during the session or at an end of the session, an action.