In this letter, a segment algorithm based on color feature of images is proposed. The al- gorithm separates the weed area from soil background according to the color eigenvalue, which is obtained by analyzing the colo...In this letter, a segment algorithm based on color feature of images is proposed. The al- gorithm separates the weed area from soil background according to the color eigenvalue, which is obtained by analyzing the color difference between the weeds and background in three color spaces RGB, rgb and HSI. The results of the experiment show that it can get notable effect in segmentation according to the color feature, and the possibility of successful segmentation is 87%-93%. This method can also be widely used in other fields which are complicated in the background of the image and facilely influenced in illumination, such as weed identification, tree species discrimination, fruit picking and so on.展开更多
Although males are generally less discriminating than females when it comes to choosing a mate, they still benefit from distinguishing between mates that are receptive to courtship and those that are not, in order to ...Although males are generally less discriminating than females when it comes to choosing a mate, they still benefit from distinguishing between mates that are receptive to courtship and those that are not, in order to avoid wasting time and ener- gy. It is known that males of Drosophila melanogaster are able to learn to associate olfactory and gustatory cues with female re- ceptivity, but the role of more arbitrary, visual cues in mate choice learning has been overlooked to date in this species. We there- fore carried out a series of experiments to determine： 1） whether males had a baseline preference for female eye color （red versus brown）, 2） if males could learn to associate an eye color cue with female receptivity, and 3） whether this association disappeared when the males were unable to use this visual cue in the dark. We found that naive males had no baseline preference for females of either eye color, but that males which were trained with sexually receptive females of a given eye color showed a preference for that color during a standard binary choice experiment. The learned cue was indeed likely to be truly visual, since the prefe- rence disappeared when the binary choice phase of the experiment was carried out in darkness.This is, to our knowledge l） the first evidence that male D. melanogaster can use more arbitrary cues and 2） the first evidence that males use visual cues during mate choice learning. Our findings suggest that that D. melanogaster has untapped potential as a model system for mate choice learning.展开更多
文摘In this letter, a segment algorithm based on color feature of images is proposed. The al- gorithm separates the weed area from soil background according to the color eigenvalue, which is obtained by analyzing the color difference between the weeds and background in three color spaces RGB, rgb and HSI. The results of the experiment show that it can get notable effect in segmentation according to the color feature, and the possibility of successful segmentation is 87%-93%. This method can also be widely used in other fields which are complicated in the background of the image and facilely influenced in illumination, such as weed identification, tree species discrimination, fruit picking and so on.
文摘Although males are generally less discriminating than females when it comes to choosing a mate, they still benefit from distinguishing between mates that are receptive to courtship and those that are not, in order to avoid wasting time and ener- gy. It is known that males of Drosophila melanogaster are able to learn to associate olfactory and gustatory cues with female re- ceptivity, but the role of more arbitrary, visual cues in mate choice learning has been overlooked to date in this species. We there- fore carried out a series of experiments to determine： 1） whether males had a baseline preference for female eye color （red versus brown）, 2） if males could learn to associate an eye color cue with female receptivity, and 3） whether this association disappeared when the males were unable to use this visual cue in the dark. We found that naive males had no baseline preference for females of either eye color, but that males which were trained with sexually receptive females of a given eye color showed a preference for that color during a standard binary choice experiment. The learned cue was indeed likely to be truly visual, since the prefe- rence disappeared when the binary choice phase of the experiment was carried out in darkness.This is, to our knowledge l） the first evidence that male D. melanogaster can use more arbitrary cues and 2） the first evidence that males use visual cues during mate choice learning. Our findings suggest that that D. melanogaster has untapped potential as a model system for mate choice learning.
