Face detector not working on this image

[rohith2506]

Hey,

I was trying to run facefinder on this particular image

https://user-images.githubusercontent.com/88735/81735832-f0d8cf00-9495-11ea-909c-2bd1dd65394b.png

and I am unable to detect any faces. Can you help me why it's the case?
Actually I saw this pattern for different faces which are quite close such as couples.

Command I used

./pigo --in couple6.png -out out.png -pl -cf cascade/facefinder

I just took the defaults

[rohith2506]

I didn't understand the algorithm and its limitations first. Thanks for building this library. Highly appreciate it :)