Touzi edge detection doesn't recognise any edges

Description

Describe what happens and why you think it is a bug I tried to use otbcli_EdgeExtraction, which works amazing for Sobel and gradient. However, for my application I need to use the Touzi filter, which doesn't recognize any edges (which I tried for multiple images and radius). The reason I think this is a bug, is that it works for Sobel and gradient, but doesn't return any edges for the Touzi filter.

Steps to reproduce

Take any image (I use .png images).

Should work: otbcli_EdgeExtraction -in example.png -channel 1 -out temp.png uint8 -filter sobel

Does not work: otbcli_EdgeExtraction -in example.png -channel 1 -out temp.png uint8 -filter touzi

For some images it showed some dots, but in general all I get is images where all pixels are of value zero.

Configuration information

I used the Ubuntu build and used the documentation from here: https://www.orfeo-toolbox.org/CookBook/Applications/app_EdgeExtraction.html.