Estimation on chlorophyll quantity of tea garden by means of digital camera image

The quality of the growth and development of the tea is easy to come out in the leaf color, and the quality tends to be excellent when there is much chlorophyll content in the leaf. Therefore, we examined estimation on chlorophyll quantity of tea garden using the digital camera which can take tea garden as the surface and that the handling is also easy. I Acquisition method for digital camera image 1 Even in sunny days, the reflection of direct sunlight and the glitter of leaf surface were able to be prevented by covering tea leaf canopy surface with umbrellas and so forth, and stable image was obtained. 2 We took several photographs of tea leaf canopy surface from an identical height and direction, by changing distance and angle. By averaging each of digital camera image values, we were able to obtain the results that were corresponding to the changes of image due to the position and the inclination angle of leaf blades, without using a compensation equation. II Estimation on chlorophyll quantity by means of digital camera image 1 We took several photographs of tea gardens with different colors of leaf canopy surface, and conducted multiple regression analysis on the average value of each of digital image values or the regression analysis by the operation value of each value. Thus an equation to estimate the chlorophyll quantity per surface area of canopy was successfully obtained. 2 When the chlorophyll quantity was estimated in the case of different photographing days or tea gardens of other areas, the estimation values had significantly positive correlation with the analytical values. However, when chlorophyll content was low, the estimation with high reliance was impossible to obtain from the estimation equation, as the value tented to be overestimated than the analysis. 3 We were not able to obtain an estimation equation capable of corresponding to every possible condition.