Abstract: from conventional black and white video systems are being digitized in computers to measure the area of small particles. The method was developed to accurately measure the area of trash in cotton. However, it can be applied to similar area measuring problems. Because a video system exhibits different sensitivities to light at different wavelengths, its output changes as the color of an image changes. Additionally, the spectral distribution of illumination influences the light reflected from objects. Video measurements for the background material were used to set the threshold value needed to identify image pixels associated with trash particles. The effect of particle color on its measured area was demonstrated with painted dots on panels and actual cotton samples. !6
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