Collecting images using portable devices is an effective and convenient method for acquiring crop trait information.Because of uncertain environmental conditions in the field,enhancement is necessary to improve the vi...Collecting images using portable devices is an effective and convenient method for acquiring crop trait information.Because of uncertain environmental conditions in the field,enhancement is necessary to improve the visual quality of images.With this aim,here we propose an adaptive image enhancement method based on guided filtering.Our method automatically calculates the enhancement weights of the detail in an image according to the distribution characteristics of the illumination intensity of a crop image,so as to adaptively adjust the contrast of the image.To verify the effectiveness of the proposed algorithm,we performed enhancement experiments on 50 images of four kinds of cucumber leaf tissues,namely,leaves infected with target spot,powdery mildew,and downy mildew,and healthy leaves.The results showed that our proposed method substantially improved the visual quality of the images.Moreover,the mean ratios of the contrast to color difference obtained using the proposed method were higher than the mean ratios obtained using five conventional enhancement methods.We consider the proposed method for image enhancement will be a valuable addition to the crop trait information acquisition system(http://ebreed.com.cn/).展开更多
基金supported financially by the National Natural Science Foundation of China(No.61403035)National Key Research and Development Program of China(No.2016YFD0800907)the Youth Research Foundation of Beijing Academy of Agriculture and Forestry Sciences(No.QNJJ201623).
文摘Collecting images using portable devices is an effective and convenient method for acquiring crop trait information.Because of uncertain environmental conditions in the field,enhancement is necessary to improve the visual quality of images.With this aim,here we propose an adaptive image enhancement method based on guided filtering.Our method automatically calculates the enhancement weights of the detail in an image according to the distribution characteristics of the illumination intensity of a crop image,so as to adaptively adjust the contrast of the image.To verify the effectiveness of the proposed algorithm,we performed enhancement experiments on 50 images of four kinds of cucumber leaf tissues,namely,leaves infected with target spot,powdery mildew,and downy mildew,and healthy leaves.The results showed that our proposed method substantially improved the visual quality of the images.Moreover,the mean ratios of the contrast to color difference obtained using the proposed method were higher than the mean ratios obtained using five conventional enhancement methods.We consider the proposed method for image enhancement will be a valuable addition to the crop trait information acquisition system(http://ebreed.com.cn/).
