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Journal of Electronic Imaging

Development of a novel system for accurate and continuous measurement of fruit diameter in agriculture and its applications to grapes
Author(s): Qingbing Zeng; Chengliang Liu; Yu-bin Miao; Shiping Wang
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Paper Abstract

The measurement of rapid and microsize changes in fruit diameter can be used to understand how plants respond to diurnal variation in water content and long-term growth conditions. The most current techniques involve physical measurements. The contact of the physical sensor places a stress on fruit and affects normal fruit growth. To solve this problem, we present a noncontact optical method for measuring fruit diameter in crop fields accurately. A rough-to-fine strategy is considered, where a binary image is first obtained and used to find candidate fruit body edge points; then a Zernike moment operator is used to determine edges of the fruit body with subpixel accuracy. Finally, the fruit diameter is computed from the edge pixels of the fruit body. Measuring experiments performed during the bloom stage of grapes show high sensitivity of the proposed method. This allows for clear detection of diurnal patterns of grape diameter changes and precise monitoring of very slight variations in fruit growth rates. Experiments show that the developed system is robust, accurate, and effective. The proposed technique has proven to be an effective tool to better detect physiological disorders in plants.

Paper Details

Date Published: 1 October 2009
PDF: 12 pages
J. Electron. Imag. 18(4) 043005 doi: 10.1117/1.3256159
Published in: Journal of Electronic Imaging Volume 18, Issue 4
Show Author Affiliations
Qingbing Zeng, Shanghai Jiao Tong Univ. (China)
Chengliang Liu, Shanghai Jiao Tong Univ. (China)
Yu-bin Miao, Shanghai Jiao Tong Univ. (China)
Shiping Wang, Shanghai Jiao Tong Univ. (China)

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