When analyzing optical flow data, there is usually a whole bunch of features which can be visualized.
Those can be the original sequence itself, the flow, amplitudes thereof, the error margins, etc.
Argos is an image viewer specially designed to display this data in a convenient way.
Each set of data (usually an image or an sequence of images), which is called a View in the program context can be processed by various operations and be used as input for another View.
This way one can create a whole graph or pipeline of views which will automatically update itself if one of the single views is changed.
For example, you can pick a single frame from a sequence using the appropriate operation, and then create a new view depending on the first one where you display the amplitude of the image.
If you select another frame from the sequence, the second view will automatically display the amplitude for this frame.