[mythtv] Commercial logo detection

[Nick Rosier]

I just activated logging for commercial flagging in an attempt to
improve it on my system and I've noticed these type of messages:

Testing Logo area: topleft (65,42), bottomright (660,505)

Most channels I record have the logon on the topright. Am I correct in
assuming that current logo detection only checks topleft and
bottomright?
I have one channel with an opaque logo in the topright that doesn't
seem to detect the logo:

2005-02-26 11:13:12.044 No suitable logo area found.

N.