Hough Transform

Hough Transform is a conventional way to detect lines from images. Let me show you an example. Here is a crazy collection of "TIDE" (from rakuten.co.jp).


And the result of Hough Transform on this image is below.


White lines are showing edge lines of the image, and red lines are detected by Hough Transform. Red lines correspond to edges of shelves well.
It might be useful to detect edges of shelves and get information on the location of visually-impaired against shelves.