ISHS Acta Horticulturae 245: Engineering and Economic Aspects of Energy Saving in Protected Cultivation
THE USE OF IMAGE PROCESSING UNDER GREENHOUSE CONDITIONS FOR GROWTH AND CLIMATE CONTROL |
| Author: | G.R. Hack |
| Abstract:
An image processing system is tested under greenhouse conditions for on-line measurements of growth of lettuce. By using the near-infrared region from 750 – 1100 nm for recording the image, the background behind the plant can be eliminated. The experiments show, that there is a correlation between global radiation and measured leaf area values. The contrast between soil and plant decreases at high radiation level. So, it is necessary to correct the used grey level in accordance to the radiation intensity. An evaluation of the relation between fresh weight and recorded leaf area of the plants gives the best accordance with an exponential regression equation. However, the equation only describes the relation in the first growing period precisely. Therefore modifications of the initial equation for the other growing periods are required. | |
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