Open the CIVx web interface at address http://Z4/CIV. Enter the file .civ in the directory of the image series to process. Enter possibly a mask file and a custom measurement grid, then click on processing options.
A new web page appears, where the processing parameters can be chosen. Use the default algorithm selection CIV1. Keep the default values for the algorithm option and FIX option on the right.
The image organisation options give the first and last image numbers to process, as well as an interval increment N step.
Choose the pattern box sizes (
and 
on the interface).
The default values 
21 are generally appropriate for
a first run with good images. Reduce it to optimize the spatial resolution,
but then false vectors may appeart in zones with fiew particles. Increase
the box size with poor images with few particles. To analyse a boundary
layer, you can use a streamwise elongated box with the same area,
for instance 11x41 or 5x81. See also 3.2.1.
The search box size (
and 
) have to be chosen
to contain the maximum pixel displacement in the field, see 3.2.2.
Avoid excessive search box size, which favors the appearance of false
vectors, and increases the computing time. If a systematic velocity
direction is expected, you should introduce a systematic shift ( ShiftX
and ShiftY)), and reduce the search box accordingly (by
ShiftX/2 and ShiftY/2 along each coordinate). If you have not introduced
a grid file, choose a mesh for the grid of measurement points, in
pixels.
The smoothing parameter 
tunes the smoothing of the fit
of the image correlation needed to find its maximum. The optimum choice
should depend on the particle size and level of image noise. We do
not have a clear criterium of choice, so just keep the default value
1.
Select the image pair chosen for the correlations.
Select the option log.file to get a record file of the processing events. If this log.file does not appear quickly in the image directory, look at http://z4/civ/civbot/TODO.txt whether your job is on the waiting list.