Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:Signals inspector such as oscilloscope, image processing library such as OpenCV, pattern matching algorithm (Dynamic Time Warping [9], five degrees-offreedom gesture recognition) are integrated and ready-to-use to support that informal design technique.
Category: