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The friction head ( Hf ) can be calculated by the Hazen-Williams equation discussed in the next section . This displacement is given by the intensity of pixels in the buffer , offset by 128 so that zero displacement will have an intensity of 128 , +2 pixels 130 , -4 pixels 124 etc. DigImage also produces a vector plot indicating the optimal displacements for the pair of images . The difference will be divided by the mean , and then stored in buffer 0 for filtering before comparison with the previous optimal . Even the facts of science may dust the mind by their dryness , unless they are in a sense effaced each morning , or rather rendered fertile by the dews of fresh and living truth . most of the students involved gain entry on the basis of some combination of work experience , journeymen or apprenticeship papers and college diplomas and in accordance with requirements established by the Ministry of Education and now by the Ontario College of Teachers .