It is necessary to measure the progress of young vegetables.
The image processing and laser sense are effective methods for intact and non-destructive measurement.
The objection of this study was to construct the automatic sorting system by image processing and laser senses.
In this report, it has tested to extract seedling image based on chromaticity in color image of seedling. The indices of property as the size and shape of seedlings were measured by the horizontal projected. And the relations between the property indices and the top fresh weight were inspected.
As the results, it was admitted that there are linear relation between the leaf area, stem diameter and top fresh weight. And there were important factors to revaluate the quality of the vegetable seedling.
Key words: Seedling; image processing; laser sense; growth measuring.