Abstract:

The gradation of seedlings is an important means for increasing the survival rate of seedlings in afforestation,which has important significance for planting trees and greening environment.The manual gradation of afforestation seedlings not only expends a lot of human resources,but also has a high intensity of labour and lower efficiency,so the automatic technolgy of seedling grading has been studied widely.The development of the automatic technology of seedling grading is reviewed briefly in this paper.The research on the automatic technology of seedling gradation was started with auto-measurement of some morphological characteristics.Now the automatic gradation system of seedlings based on computer vision has been studied.In the future,automatic gradation technology of seedlings will be more perfect.And improving seedling's morphological characteristics and applying new non-morphological characteristics in the automatic gradation technology of seedlings is the most important task in the further research.Therefore,new computer vision system based on color image processing and 3D image processing is brought forward in this paper as the most promising subject in this field.More comprehensive characteristics are considered in the new system and more accurate result will be achieved.

Key words: Seedling gradation, Auto-measurement, Computer vision, Image processing