Unfortunately observing lights will not always provide the correct rules, it's easier to read the rulebook.

http://peds.org/resources/pedestrian_right_of_way/

Start reading at: Pedestrian control signals

Also:

http://www.mto.gov.on.ca/english/dandv/driver/handbook/secti...

http://www.durham.ca/print.asp?nr=/departments/works/roads/t...