**correlate params**
The following parameters can be accessed via the interactive dialogue box labeled **Cor params**:

**Height**, **Width**. Dimensions of correlation blocks.

**Stretch**, **Compress**. Defines the limits of the stretch algorithm. Both must be positive or zero, and **compress** should not be bigger than **width/2**.

**Shear.** Defines the range of values for the shear algorithm. This number, must be positive.

**EDelta.** During the creation of the output disparity, a compatibility criterion exists whereby an edge must be present, to within , when the disparity estimate is projected into the right image.

**Range.** The disparity search range. The search takes place over
, where initial is supplied by either the input disparity image or is estimated from the regions of interest.

**CtF Scaling** The stretch correlation algorithm is run initially on a down sampled
version of both stereo images, inorder to home in on the solution which is consistent
across scales. This choice menu determines the greatest level of down sampling used.