The array is next reconstructed such that the image analysis is only applied to regions of interest (2,160 X 2,160 pixels). Each cell is redefined by using the marker dot centre as datum, such that the cell area is ±22 pixels in the horizontal and vertical direction from the centre pixel. To check the accuracy of the marker dot position and subsequent reconstruction, the code samples 6 X 6 cells that are evenly spaced across the entire array. A sample result is shown in Figure .