Processing of Artificial Targets for Automatic Evaluation of Spray Quality

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Marçal, A.R.S. (Author) FCUP; Cunha, M. (Author) FCUP

Journal

Title: Transactions - American Society of Agricultural Engineers: General Edition

Vol. 51 No. 3

Pages: 811-821

ISSN: 0001-2351

Publisher: American Society of Agricultural Engineers

Indexing

ISI Web of Science

Scientific classification

FOS: Agrarian Sciences > Other Agrarian Sciences

Other information

Abstract (EN): A fully automatic methodology based on image processing is proposed to evaluate the quality of spray application sampled by water‐sensitive papers (WSP). The methods proposed permit a computation of the fraction of spray coverage, an evaluation of the homogeneity of the spray spatial spread at various scales and directions, and extraction of stain and droplet size range and distribution. This allows the number of droplets per unit area and the standard droplet size spectra factors to be computed. The methods were tested with a number of test samples scanned at different resolutions, proving to be effective in situations where there is high spray coverage in the WSP, thus with considerable overlap between stains. The most suitable scanning resolution was found to be 600 dpi. The results obtained by the image processing methods were successfully compared with a manual (visual) counting of stains in a test sample.

Language: English

Type (Professor's evaluation): Scientific