1. A method performed by at least one computer processor, the method comprising: (A) receiving a first image input in an image input sequence; (B) receiving a second image input in the image input sequence, wherein the second image input has a relative position subsequent to the first image input in the image input sequence; (C) at the at least one computer processor, applying a frame sample filter to the first image input to produce a sample pattern comprising at least one sample; (D) at the at least one computer processor, applying a sample registration filter to the second image input and the sample pattern to identify: (1) an unfiltered flow sample set comprising at least one optical flow sample, wherein the unfiltered flow sample set defines a coregistration between the first image input and the second image input; (2) at least one fault warning representing a degree of confidence in the coregistration; (E) at the at least one computer processor, removing, from the unfiltered flow sample set, at least one sample specified by the at least one fault warning as in-fault, to produce a filtered flow sample set; and (F) at the at least one computer processor, generating optical flow confidence estimate output based on the filtered flow sample set.