1. A method for processing retail store shelf images, comprising: receiving, at a shelf edge detection component having a processor, an image containing shelf edge content displayed on a shelf edge; determining, by the processor, a location of the shelf edge content and an apparent orientation of the shelf edge content; determining, by the processor and based on the location of the shelf edge content and the apparent orientation of the shelf edge content, a region in the image corresponding to the shelf edge; and providing, by the shelf edge detection component, an output based on the image that identifies the region in the image corresponding to the shelf edge.