Richelle Ebrahimi

I am in my third year Mechanical Engineering, Electro-Mechanical Design Option at the University of British Columbia. I am currently working as a Co-op Summer Student for the Advanced Papermakers Initiative.

My project is to develop a Paper Formation Analysis program, which will be built using Matlab R11. The program will calculate various formation coefficients and display histograms and graphs of these variations (see Figures 1 and 2).

Figure 1. Basis Weight Histogram

Figure 2. Calibration Curve

Figure 1 displays a histogram of the basis weight variation in a paper sample. In order for the basis weight histogram to be displayed the gray level values must be converted to basis weight values. To perform this operation a calibration curve is used (see Figure 2) to find a logarithmic relationship between gray level and basis weight.

From Figure 1 the Coefficient of Variation can be calculated.

Mean = 49.32 g/m2

Standard Deviation = 3.22 g/m2

COV = Standard Deviation/ Mean = 0.0653

The COV is a first-order statistical coefficient and does not give sufficient information about paper formation. Therefore, the software that I am designing will also calculate second order statistical coefficients (Using the Co-occurrenceMatrix and the Fast Fourier Transform) such as Energy, Contrast, Correlation, Entropy and Homogeneity.

For further information, I may be contacted at ebrahimi@interchange.ubc.ca.