Methods and systems for planogram matching are described. The methods include capturing an image, processing the image to identify a product based on a symbolic identifier, receiving a planogram, identifying a region of a planogram based on a linear grouping, determining a geometrically consistent match between the product and a sample product included in the region of the planogram, and determining an alignment between the region of the planogram and a corresponding region of the image that includes the product. The methods may further include determining a location in the corresponding region that does not include an expected product based on the planogram.