According to the characteristics of sonar image data with big data feature,In order to accurately detect underwater objects of sonar image,a novel adaptive threshold FCM(fuzzy clustering algorithm,FCM) based on freque...
详细信息
According to the characteristics of sonar image data with big data feature,In order to accurately detect underwater objects of sonar image,a novel adaptive threshold FCM(fuzzy clustering algorithm,FCM) based on frequency domain and time domain is *** on the relationship between sonar image data and big data,Firstly,wavelet de-noising method is used to smooth *** de-noising,the sonar image is blocked and each sub-block region is processed by two-dimensional discrete Fourier transform,their maximum amplitude spectrum used as frequency domain character,then time domain of mean and standard deviation,frequency domain of maximum amplitude spectrum are taken for character to complete block k-means clustering,the initial clustering center is determined,after that made use of FCM on sonar image detection,based on clustered image,adaptive threshold is constructed by the distribution of sonar image sea-bottom reverberation region,and final detection results of sonar image are *** comparison different experiments demonstrate that the proposed algorithm get good detection precision and adaptability.
In order to quickly and accurately realize target recognition when the crop demanding,adopt green strength of RGB′s method to identify the crop from the background of elaphic,the recognition accuracy was more than 98...
详细信息
In order to quickly and accurately realize target recognition when the crop demanding,adopt green strength of RGB′s method to identify the crop from the background of elaphic,the recognition accuracy was more than 98%.Use density DBSCAN fuzzy clustering algorithm,by means of setting two parameters e and MinN,in the density DBSCAN fuzzy clustering algorithm,to determine a cluster gather on the each target,by means of judging the existence of the clustering gather or not to determine the *** the help of image division technology,calculate the area ratio of the target and calculate the need of quantity of *** means of calculating the centre point of each clustering gather(target),realize to control sprayer motion trail,realize accurately targeting and variable rate spraying pesticide(Fertilizer) when the crop sowing in line at seeding.
The aim of this work is to automatically identify and extract the upwelling area in the coastal ocean of Morocco using the satellite observation of chlorophyll concentration. The algorithm starts by the application of...
详细信息
ISBN:
(纸本)9781509004799
The aim of this work is to automatically identify and extract the upwelling area in the coastal ocean of Morocco using the satellite observation of chlorophyll concentration. The algorithm starts by the application of FCM algorithm for the purpose of finding regions of homogeneous concentration of the chlorophyll, resulting in c-partitioned labeled images. A region-growing algorithm is then used to filter out the noisy structures in the offshore waters not belonging to the upwelling regions. The proposed methodology has been validated by an oceanographer and tested over a database of 166 weekly Sea Surface chlorophyll data. The region of interst cover the southern part of Moroccan atlantic coast spanning from the years 2007 to 2012.
暂无评论