查看更多>>摘要：Optic disc (OD) detection is a main step while developing automated screening systems for diabetic retinopathy.We present a method to automatically locate and extract the OD in digital retinal fundus images.Based on the property that main blood vessels gather in OD,the method starts with Otsu thresholding segmentation to obtain candidate regions of OD.Consequently,the main blood vessels which are segmented in H channel of color fundus images in Hue saturation value (HSV) space.Finally,a weighted vessels' direction matched filter is proposed to roughly match the direction of the main blood vessels to get the OD center which is used to pick the true OD out from the candidate regions of OD.The proposed method was evaluated on a dataset containing 100 fundus images of both normal and diseased retinas and the accuracy reaches 98％.Furthermore,the average time cost in processing an image is 1.3 s.Results suggest that the approach is reliable,and can efficiently detect OD from fundus images.
查看更多>>摘要：Larger amount of national and provincial forest eco-compensation funds in China have been distributed to farmers annually,which aims to encourage farmers input more labor and fund in daily forestry management.We selected 503 household from 50 villages of 10 counties in Jiangxi Province in the paper.Household labor and cash input responded negatively towards forest eco-compeusation fund in forestry management.Forest eco-compensation subsidy (FECS) granted to the household in the rural mountain area didn't stimulate the household labor and cash input in forestry management.It implies that it is not a wise way to distribute FECS equally to the rural household,so as to promote the forestry ecological quality.The current forest eco-compensation policy(FECP) need modifying urgently.
国家科技期刊平台
NSTL
维普
万方数据