Cross Correlation 2D

Description Cross correlate input and reference volumes in two-dimensional space.
Module(s) Image Gather Processing, Gather Attributes, Explorationist
Requirements Volume
Related Autocorrelation, Deconvolution Cross Correlation
Works with 2D, Stacks, Gathers

Cross correlate input and reference volumes in two-dimensional space i.e. along both horizontal and vertical directions.

Note that for all output modes, the shifts are from the perspective of the primary input volume. That is to say, each shift in the correlogram (or the best shift written to the header) indicates the amount of shift that would need to be applied to the primary input record, to achieve that correlation.

Create a  Cross Correlation 2D process

Create a cross correlation process
  1. In the Control Panel, open the Process tab.
  2. At the tab header, click the Add icon and select New Process.
  3. Scroll down and double-click on Cross Correlation 2D.
  4. Type a name for the process and click OK.

Configure the Cross Correlation 2D process

  1. Volume: Select the primary input volume.
  2. Reference volume: A single inline record 3D volume containing a cross correlation kernel. This must be an on-disk volume.
  3. Output mode:
    1. Headers: Output the horizontal or vertical trace shifts that would result in the best correlation value to selected headers. The input sample data is left unmodified. Note: when applying cross correlation on paneled data, the horizontal shift value may be the local maxima shift only i.e. over the paneled data.
      1. Correlation Output Header
      2. Horizontal Shift Output Header
      3. Vertical Shift Output Header
    2. Correlogram: Output a correlogram of cross-correlations, each sample corresponding to a particular shift. The output correlogram volume is of the same dimensions as the primary input volume.
      1. Normalise: Normalises the correlogram. Only visible when the output is set to correlogram.