海滩垃圾日益增多,流入大海不但会对海洋环境造成污染,而且会影响海洋生物健康。对海滩垃圾进行识别并分类处理具有重要意义。提出基于改进的(you only look once version4,YOLO-v4)目标检测算法的垃圾识别分类方案。通过现场拍摄海滩...海滩垃圾日益增多,流入大海不但会对海洋环境造成污染,而且会影响海洋生物健康。对海滩垃圾进行识别并分类处理具有重要意义。提出基于改进的(you only look once version4,YOLO-v4)目标检测算法的垃圾识别分类方案。通过现场拍摄海滩垃圾图片,建立垃圾数据库;改进的YOLO-v4算法在传统的YOLO-v4网络架构SCPDarkNet53上融入混合空洞卷积结构,增强感受域的连续性,降低信息在池化过程中造成信息丢失的程度。引入空间锯齿空洞卷积,获取更多细节特征,将数据集导入改进后YOLO-v4架构中,实现图像中垃圾种类的识别。实验研究表明,相比YOLO-v4通用算法,所提算法在识别海滩垃圾的准确率提升了6%,对海滩环境的保护有一定的推广意义。展开更多
AIM:To evaluate refractive outcomes and corneal astigmatism changes after Toric implantable collamer lens with a central port(V4c T-ICL)implantation over 1y of follow-up.METHODS:A retrospective study was performed inc...AIM:To evaluate refractive outcomes and corneal astigmatism changes after Toric implantable collamer lens with a central port(V4c T-ICL)implantation over 1y of follow-up.METHODS:A retrospective study was performed including 50 eyes of 50 patients that underwent V4c T-ICL implantation.Uncorrected(UDVA)and corrected(CDVA)distance visual acuities,refraction,refractive and corneal astigmatism changes and corneal coupling correction were evaluated preoperatively,1 and 12mo postoperatively.Vector analysis was used for astigmatism changes.Coefficient of adjustment(CAdj)was calculated for corneal coupling analysis.RESULTS:The mean UDVA achieved was 0.03 logMAR at 1mo and remained unchanged throughout the whole follow-up(P=0.193).At the last visit,84%of the eyes achieved a CDVA of 0.00 logMAR or better.Regarding spherical equivalent refraction(SEQ),96%of eyes were ranges of±1.00 D and 84%of them within±0.50 D.Also,94%of eyes had a remaining refractive cylinder within±1.00 D and 78%of them within±0.50 D.Both,SEQ and refractive cylinder,remain stable over the postoperative follow-up(P=1.000 and P=0.660,respectively).In terms of surgically induced astigmatism(SIA),no statistically significant differences were found over the follow-up(P=0.102)and under correction was found with a correction index lower than the unit at each visit.A keratometric astigmatism induced of 0.59±0.53(vector mean:0.26×73º)D was reached at the last visit.No significant changes in terms of corneal astigmatism orientation were reported over post-surgery visits(P=0.129 and P=0.097 at 1 and 12mo respectively).No clinical significance was found for CAdj on with-the-rule astigmatism.No postoperative complications resulting from the surgery were found.CONCLUSION:Refractive outcomes suggest that the V4c T-ICL implantation for correction of myopic astigmatism was satisfactory in terms of effectiveness,safety,and stability during 1y of follow-up.Corneal astigmatism induced by the incision around 0.5 D is achieved according to the remaining refractive cylinder found at one-year post-surgery.Corneal coupling analysis results in no unexpected spherical change.展开更多
文摘海滩垃圾日益增多,流入大海不但会对海洋环境造成污染,而且会影响海洋生物健康。对海滩垃圾进行识别并分类处理具有重要意义。提出基于改进的(you only look once version4,YOLO-v4)目标检测算法的垃圾识别分类方案。通过现场拍摄海滩垃圾图片,建立垃圾数据库;改进的YOLO-v4算法在传统的YOLO-v4网络架构SCPDarkNet53上融入混合空洞卷积结构,增强感受域的连续性,降低信息在池化过程中造成信息丢失的程度。引入空间锯齿空洞卷积,获取更多细节特征,将数据集导入改进后YOLO-v4架构中,实现图像中垃圾种类的识别。实验研究表明,相比YOLO-v4通用算法,所提算法在识别海滩垃圾的准确率提升了6%,对海滩环境的保护有一定的推广意义。
文摘AIM:To evaluate refractive outcomes and corneal astigmatism changes after Toric implantable collamer lens with a central port(V4c T-ICL)implantation over 1y of follow-up.METHODS:A retrospective study was performed including 50 eyes of 50 patients that underwent V4c T-ICL implantation.Uncorrected(UDVA)and corrected(CDVA)distance visual acuities,refraction,refractive and corneal astigmatism changes and corneal coupling correction were evaluated preoperatively,1 and 12mo postoperatively.Vector analysis was used for astigmatism changes.Coefficient of adjustment(CAdj)was calculated for corneal coupling analysis.RESULTS:The mean UDVA achieved was 0.03 logMAR at 1mo and remained unchanged throughout the whole follow-up(P=0.193).At the last visit,84%of the eyes achieved a CDVA of 0.00 logMAR or better.Regarding spherical equivalent refraction(SEQ),96%of eyes were ranges of±1.00 D and 84%of them within±0.50 D.Also,94%of eyes had a remaining refractive cylinder within±1.00 D and 78%of them within±0.50 D.Both,SEQ and refractive cylinder,remain stable over the postoperative follow-up(P=1.000 and P=0.660,respectively).In terms of surgically induced astigmatism(SIA),no statistically significant differences were found over the follow-up(P=0.102)and under correction was found with a correction index lower than the unit at each visit.A keratometric astigmatism induced of 0.59±0.53(vector mean:0.26×73º)D was reached at the last visit.No significant changes in terms of corneal astigmatism orientation were reported over post-surgery visits(P=0.129 and P=0.097 at 1 and 12mo respectively).No clinical significance was found for CAdj on with-the-rule astigmatism.No postoperative complications resulting from the surgery were found.CONCLUSION:Refractive outcomes suggest that the V4c T-ICL implantation for correction of myopic astigmatism was satisfactory in terms of effectiveness,safety,and stability during 1y of follow-up.Corneal astigmatism induced by the incision around 0.5 D is achieved according to the remaining refractive cylinder found at one-year post-surgery.Corneal coupling analysis results in no unexpected spherical change.
