METHOD FOR MEASURING EVENNESS OF NONWAVEN FABRIC

摘要

PURPOSE: A method is provided to evaluate evenness of novena fabric rapidly to control production processes with a feedback of the evaluation result by calculating an average value, a histogram, and a variation coefficient. CONSTITUTION: An image input is carried out by a CCD camera(14). The light from the CCD camera(14) is irradiated on novena fabric and an amount of light reflected from a surface of the novena fabric is divided into pixels for measurement. Pre-processing is performed by leveling a histogram and removing an image noise. An image analysis is carried out wherein an average value, a histogram, and a variation coefficient are calculated from restructured image data. The leveling of the histogram is carried out by leveling the brightness distribution in 4 to 256 steps.