This method multiplies a constant times a portion of a column
of a matrix and adds the product to the corresponding portion
of another column of the matrix --- a portion of col2 is
replaced by the corresponding portion of a*col1 + col2.
This method multiplies a constant times a portion of a column
of a matrix x[ ][ ] and adds the product to the corresponding portion
of a vector y[ ] --- a portion of y[ ] is replaced by the corresponding
portion of ax[ ][j] + y[ ].
This method multiplies a constant times a portion of a vector y[ ]
and adds the product to the corresponding portion
of a column of a matrix x[ ][ ] --- a portion of column j of x[ ][ ]
is replaced by the corresponding
portion of ay[ ] + x[ ][j].
Compute full flow field from the first order gradients in dx, dy, dt
for a weighted local neighborhood omega (weighted by G defined by sigmaw)
around every image location.
This plugin crops the image to a set size centered around the centroid of the current ROI,
scales it by a set size and saves it under the original name.