Segmenting blurred and conglutinated bubbles in a flotation image is done using a new segmentation method based on Seed Region and Boundary Growing(SRBG).Bright pixels located on bubble tops were extracted as the se...Segmenting blurred and conglutinated bubbles in a flotation image is done using a new segmentation method based on Seed Region and Boundary Growing(SRBG).Bright pixels located on bubble tops were extracted as the seed regions.Seed boundaries are divided into four curves:left-top,right-top,right-bottom, and left-bottom.Bubbles are segmented from the seed boundary by moving these curves to the bubble boundaries along the corresponding directions.The SRBG method can remove noisy areas and it avoids over- and under-segmentation problems.Each bubble is segmented separately rather than segmenting the entire flotation image.The segmentation results from the SRBG method are more accurate than those from the Watershed algorithm.展开更多
文摘网箱养殖区的动态监测与分析是水库环境监测的一项重要指标。鉴于网箱养殖区在影像中存在较弱的光谱和形状规律性,自动提取难度较大,提出了一种综合基于像元和面向对象优势的自动提取方法。首先,通过优化归一化差分水体指数(optimized normalized difference water index,ONDWI)将水体(包含网箱养殖区)与陆地分离;然后,利用基于比值指数的纹理特征分析法,将网箱养殖区(包含小岛及其他干扰项)与自然水体分离;最后,基于简化的区域分割算法,同时顾及网箱养殖区的形状特征将其与小岛及其他干扰项分离,最终实现网箱养殖区的精准提取。实验结果表明,该方法能够较为完整地提取出全部网箱养殖区,提取精度为88.1%,高于最小距离法(73.8%)和最大似然法(42.9%),且较好保留了网箱养殖区规则的形态特征。
基金supported in part by the National Science & Technology Support Plan of China(No.2009BAB48B02)
文摘Segmenting blurred and conglutinated bubbles in a flotation image is done using a new segmentation method based on Seed Region and Boundary Growing(SRBG).Bright pixels located on bubble tops were extracted as the seed regions.Seed boundaries are divided into four curves:left-top,right-top,right-bottom, and left-bottom.Bubbles are segmented from the seed boundary by moving these curves to the bubble boundaries along the corresponding directions.The SRBG method can remove noisy areas and it avoids over- and under-segmentation problems.Each bubble is segmented separately rather than segmenting the entire flotation image.The segmentation results from the SRBG method are more accurate than those from the Watershed algorithm.