Factors affecting results of fiber orientation determination of nonwovens during image processing

For studying factors affecting the results of the fiber orientation determination of nonwovens during image processing,the fiber orientation of simulated nonwovens was analyzed by the two-dimensional discrete Fourier transform(DFT),with focuses on the selection of threshold value during image processing and the effect of morphological processing on determining the fiber orientation.The results indicated that Otsu theory can analyze the fiber orientation more accurately when the evenness of grayscale distribution in the image is not well.However,when the number of pixels between the target area and background area is different obviously,KSW entropy is better than Otsu theory.For nonwovens with uneven fiber distribution and loose structure,erosion operation can be used in morphological processing,while the dilation is more suitable for nonwovens with dense fiber distribution.When the fiber distribution is more uniform,generally opening operation is selected.