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Quantitatively Appraise the Relationship between Environment and Body Color of Prodenia Litura(Fabricius) Larvae Based on Computer Vision

Author: GongBiYa
Tutor: WenLiZhang
School: Hunan Agricultural University
Course: Agricultural Entomology and Pest Control
Keywords: Computer Vision body color Prodenia litura (Fabricius) light intensity photoperiod temperature density
CLC: TP391.41
Type: Master's thesis
Year: 2013
Downloads: 4
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Abstract

For selection and evolution reasons, insect body color would differ according to ambient conditions and change gradually, those body color change would help with decreasing the risk of detection, increasing the chances of predation and proting the insect to resistance to environmental stress. The insect body color was divided into several color types subjectively depending on the eyes of traditional researcher, but it is difficult to express the process of continuous variation on body color.Aiming at the body color problem of Prodenia litura (Fabricius) larvae, the concepts of "Computer Vision Technology" was introduced. In order to discuss the optimum environment of digital cameras, this paper observed the samples color by using digital cameras instead of the human eyes, and to get the quantitative data of body color on Prodenia litura (Fabricius) larvae. This paper also researched the change of body color with day-old on Prodenia litura (Fabricius) larvae, and the effects of light intensity, photoperiod, temperature, density with the change of body color was also researched it.1. To explore the relation of the quality of electronic picture and the photo environment of digital cameras, the results show that, within the range of values allowed for luminosity, the accurate color of picture are positively associated with the L value of color samples; image processing could significantly increase the accuracy(△L decreased from15.6to6.1,△a decreased from6.8to1.5,△b decreased from5.2to2.0,E decreased from23.7to13.8); this paper show that, the color of picture would be accurate when we adopt the way of light with two sides and the distance of samples with14cm.2. To explore the change of body color with day-old on Prodenia litura (Fabricius) larvae, the results show that the level of lighting on the color of Prodenia litura (Fabricius) larvae decreased gradually in successive day-old, while the level of complexity increased; day-old had less effect on the purity color, but in general, it decreased, the dominant color started from green to transform gradually into red, all color parameter of subjective color(Value, deviation coefficient Colour purity index, normalization RGB)were significantly different among day-old(p<0.01).3. The impacts of light intensity to all color parameter of body color on Prodenia litura (Fabricius) larvae were significant(p<0.01). As the light intensity increased, the level of lighting and the purity color increased significantly, while the level of complexity and the delta-RGB decreased. But When the light intensity achieved10001μx, all color parameter of subjective color were no significantly(p>0.05).4. The impacts of photoperiod to all color parameter of body color on Prodenia litura (Fabricius) larvae were significant(p<0.01). As the time of light increased, the level of lighting and the purity increased gradually, but the body color would deepen and the level of color were lower, when the time of light achieved24h. The present study got the most shallow color and the highest degree of the purity color with18-hour lighting.5. The impacts of temperature to the temperature and color on Prodenia litura (Fabricius) larvae were significant(p<0.01), but no significant differences in the level of complexity(p>0.05). As the temperature increased, the level of lighting and the purity color increased significantly. But When the temperature achieved30℃, the Value of body color rose over, The present study got the highest degree of color in25℃.6. The impacts of density to all color parameter of body color on Prodenia litura (Fabricius) larvae were significant(p<0.01), As the density increased, the level of lighting and color increased gradually, while the level of complexity decreased.

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