ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

2倍多,。In computer-vision-based systems for detecting foreign fibers, an efficient segmentation method is vital for improving the speed and precision of detection. An image enhancement model was presented based on histogram analysis, an improved Otsu's method was proposed for segmenting gray images of foreign fibers, and the segmentation results were analyzed in detail. The results indicate that all histograms of gray images of foreign fibers are of single peak, and the contrast between object and background can be remarkably enhanced by the enhancement model presented. The Otsu's method is effective for images of sheet foreign fibers, but does not work well for images of wirelike or villiform fibers, as some background pixels with gray values closed to the threshold are easily segmented as object pixels by mistake. But after the images were enhanced, the satisfactory segmentation results were achieved. The improved Otsu's method reduced the searching range for calculating optimal threshold from 0～255 to 150～230. The calculating speed in this stage was improved more than twice.