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up vote 0 down vote favorite I am building an app to recognize openings of defined size, arranged in known patterns on a white foil/paper. If some openings are missing I need to recognize it and need the location feedback. Openings will be black, so contrast should be of no issue. My question : what opencv algorithm would be the best to achieve this. Explanatory note : Since the opencv tool box is huge their might be a lot of tools that would do the job in general, but neither I want to shoot on birds with canons nor use a dull knife to cut precisely. I already tried similarity measurement as described in the official documentation, it somehow works but doesn't seem to really fit in that situation. Thanks so much for your help and ideas! c++ opencv share | improve this question asked Nov 11 at 19:13 FuzzyTemper 22 9 add a comment  |  up vote 0 down vote favorite I am building an app to recognize openings of defined size,

This article is about the racing driver. For the ice hockey player, see Ronnie Pettersson. For the motorcycle speedway rider, see Ronni Pedersen. Ronnie Peterson Peterson at the 1978 Dutch Grand Prix Born ( 1944-02-14 ) 14 February 1944 Örebro, Sweden Died 11 September 1978 (1978-09-11) (aged 34) Milan, Italy Formula One World Championship career Nationality Swedish Active years 1970–1978 Teams March inc. non-works, Tyrrell, Lotus Entries 123 Championships 0 Wins 10 Podiums 26 Career points 206 Pole positions 14 Fastest laps 9 First entry 1970 Monaco Grand Prix First win 1973 French Grand Prix Last win 1978 Austrian Grand Prix Last entry 1978 Italian Grand Prix Bengt Ronnie Peterson ( Swedish pronunciation:  [ˈrɔnːɪ ²peːtɛˌʂɔn] ; 14 February 1944 – 11 September 1978) was a Swedish racing driver. Known by the nickname 'SuperSwede', [1] [2] he was a two-time runner-up in the FIA Formula One World Drivers' Championship. Peterson began his motor racing career in kart racin