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answered 2015-12-08 18:53:18 -0600
As I can see from source code, you can fill options for constructor AKAZEFeatures::AKAZEFeatures(const AKAZEOptions& options) and change its descriptor_pattern_size which is set by default to 10 ( see AKAZEConfig.h )
options
AKAZEFeatures::AKAZEFeatures(const AKAZEOptions& options)
descriptor_pattern_size