Deposits Can Manual

Portable Scanning System for Spray Deposit Qualification

Heping Zhu and Stephen M. Sciarini USDA-ARS Application Technology Research Unit, Wooster, Ohio, USA

Tel: (330) 263-3871 email: [email protected]

DepositScan Manual 2

Table of Contents

Introduction ................................................................................................................... 3

How it Works ................................................................................................................. 3

Requirements ................................................................................................................ 3

Scanner Installation ...................................................................................................... 4

DepositScan Installation............................................................................................... 8

Initial Use ....................................................................................................................... 8

Scanner Calibration .................................................................................................... 11

Setting the DepositScan parameters......................................................................... 11

Using DepositScan...................................................................................................... 12

Alternative Threshold ................................................................................................. 16

Reference herein to any specific commercial products, processes, or services by trade name, trademark, manufacturer, or otherwise, does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or the USDA Agricultural Research Service, or any of its employees or contractors


The custom plugins were developed using the Eclipse development platform and Java programming language. ImageJ is a Java image-processing software used for the acquisition, analysis and processing of images. The National Institutes of Health developed the software and has made it freely available to public.

Introduction DepositScan is a scanning program that can quickly evaluate spray deposit distribution on water sensitive paper or Kromekote® cards. The program consists of a set of custom plugins that are used by an image-processing program to produce a number of measurements useful for expressing spray deposit distribution. The DepositScan program offers a convenient solution for on-the-spot evaluation of spray quality even under field working conditions. How it Works The program may be installed on a laptop computer and it works with a handheld business card scanner to scan spray deposits on target cards. The program will also work with desktop computers and regular office scanners. When the DepositScan program is started, it opens an image-processing program, and prompts the user to scan the sample. The program then reports the individual droplet sizes, their distributions, the total number of droplets, and the percentage of area covered. The analysis of a spray deposition sample takes less than 30 seconds to complete. Requirements The software for DepositScan is available without charge, and can be downloaded from (http://www.ars.usda.gov/mwa/wooster/atru/depositscan). A laptop computer with windows 2000 or later operating system A handheld business card scanner with 600 dpi resolution. Examples:

• ScanShell 800N by CSSN, Inc. • WorldCard Office by Penpower Technology LTD • Neat Business Cards by Neat Receipts, Inc.


Note: High power USB port hubs are available for around $20 if your computer does not have a high power port.

Scanner Installation You will need to purchase a handheld business card scanner capable of 600 dpi resolution. Follow the manufacturer’s instructions to install your scanner driver, set up the scanner parameters and calibrate the scanner. This step is not needed after the first use. The following shows the installation of a Scan Shell 800N business card scanner.

(1) Plug the scanner into a high power USB port. (2) The Windows hardware wizard will appear and

ask for the software driver as shown below. Click on “No, not this time” and then click “Next”.

(3) Insert the CD provided by the scanner manufacturer:


(4) Select your scanner.

(5) Browse to the location of the software driver on the CD.


(6) Windows loads the software driver


(7) After the scanner driver has finished installing, the Wizard informs you the

hardware is ready to use.


DepositScan Installation .

(1) Create a folder named “DepositScan” on your computer’s hard drive. (2) Copy all the files into the “DepositScan” folder on your computer, following the

instructions on the website (http://www.ars.usda.gov/mwa/wooster/atru/depositscan).

Initial Use

(1) Open the DepositScan folder, and double-click on “DepositScan.bat” to run

the program. An ImageJ window will open:

Windows Firewall may attempt to block the Java program. Click “Unblock”.


…or the following screen may appear. Click “OK”.

(2) From the ImageJ window, click “Plugins” and select “Twain 6”.


Note: If your computer does not have a high power USB port, the following screen may appear:

The program cannot continue until you connect your computer and the scanner to a high power port hub.

(3) The following screen will appear asking for the scanner source:

Highlight your scanner driver and then click on “Select”.

(4) The following screen appears:


Scanner Calibration When the program is used for the first time, it will automatically ask you to calibrate the scanner as shown below. A black and white calibration paper should have been included with the scanner package provided by the manufacturer. Follow the screen instructions to calibrate the scanner.

Setting the DepositScan parameters

When the calibration has completed, the following screen appears. Insert the water sensitive paper or Kromekote® card face down into the scanner. Select “Grayscale”, choose a Resolution (dpi) of “600”, and adjust the scanning area to approximately the scan area of the scan source (e.g. 2 by 3 inches). Click “Scan”. The program will automatically save the settings for future runs.


Using DepositScan

(1) Insert the water sensitive paper or Kromekote® card face down into the scanner. (2) Open your “DepositScan” folder, and double-click on “DepositScan.bat” to run

the program. The ImageJ window will appear on the screen.

(3) From the ImageJ window, click on “Plugins” and select “Twain 6”.


(4) The following screen will appear for selecting the scanner source. Highlight your scanner driver and then click on “Select”.

(5) Click “Scan”.


(6) After the scanner has finished scanning the card, the following screen will

appear:

(7) Click the “□” in the option box and draw a box around the desired area of spray deposits to be analyzed. Click “AA” in the option box, and click back in the deposit area to begin the analysis.


(8) The result sheet appears as below. It reports the droplet size distribution (DV.1,

DV.5, and D V.9), the percent coverage of deposits within the selected area (%Coverage), the image area analyzed (Image Spot Area), the individual droplet sizes (Actual Diameter), and the total number of droplets. The third column shows the actual droplet diameters sorted from the smallest to the largest. You may click on “Save” to save the report to a data file, which can be opened by Microsoft Excel

Note: DepositScan converts each individual image spot area to the actual droplet diameter using the equation Dd = 1.06 As

0.455. DV.1, DV.5, and D V.9 represent the distribution of the droplet diameters such that droplets with a diameter smaller than DV.1, DV.5, and D V.9 compose 10%, 50% and 90% of the total liquid volume, respectively.


Alternative Threshold DepositScan has two options for choosing thresholds to adjust image detection quality. The first option is to allow the system to automatically select a detection threshold based on the image contrast, which is a standard procedure as described in “Using DepositScan”. The second option is a user-defined threshold. To define your own threshold, first scan the water sensitive paper or Kromekote® card. Click on “□” in the option box and select the area to be analyzed. Click on the “T” in the option box, then click on the image screen. The threshold box will appear for you to input the threshold to define the image detection quality that matches the actual deposit patterns.


After you have entered the desired threshold, click “Apply”, and close the Threshold screen. The result sheet will appear. Click “Save” to save the report to a data file, which can be opened by Microsoft Excel.

Deposits Can Manual

Documents

water sensitive

individual

kromekote

depositscan

microsoft

data file

total number

depositscan