| CPC G07G 1/0072 (2013.01) [G06K 7/1413 (2013.01); G06K 7/1417 (2013.01); G06Q 20/18 (2013.01); G06Q 30/018 (2013.01)] | 20 Claims |

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1. A transaction validation system for use in self-checkout at a check-out location, comprising:
a scale sized to support and weigh a plurality of items, and to track weight changes as one or more items are added to or removed from said scale;
one or more image sensors to acquire an image of each item placed on said scale; and
at least one processor configured to:
receive an updated weight measurement of all items placed on said scale based on said weight change tracking,
identify each item placed on said scale based on said acquired image,
determine an expected cumulative weight of all items placed on said scale based on said acquired image for each item, wherein said expected cumulative weight takes into account an expected deviation in a weight of each item, and
compare said expected cumulative weight with said updated weight measurement.
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