Covering & Surrounding

Areas and Perimeter of Shapes and Images

Using Imaging Processing Tools

Directions:

The software will automatically open in another window. If the tool does not run or you see a blank window or window with text information, then you need to update your Java software to include the Java Web Start capabilities. See the browser help file for guidance.

Select an image or shape to analyze. Use the following tools and options to analyze the area and perimeter of your object.

GRID: Turns on or off an initial 2 x 2 grid.
SUBDIVIDE GRID: Subdivides the grid by halving each side. Use SHIFT key with this button to undo a subdivision.
FILL SQUARE: After clicking on this tool, simply click on the squares you wish to be counted. You can select squares individually or by clicking and draggring the mouse fill multiple squares.
SUM SQUARES: If the history option is selected, the number and area of the selected squares will be shown using the current scales; otherwise the information will appear in a new window.
DRAW LINE SEGMENTS: This tool will allow you to draw segments of fixed length (current grid size). If the Fixed Length menu option is not selected, you can draw segments of any length. Simply click on the location of the first end point and then click on the location of the next end point. If you are not quite where you want to be hold down the mouse button and drag the cursor until the line segment is where you want it.
SUM EDGES: If the history option is selected, the total length of the connected edges will be shown using the current scales; otherwise the information will appear in a new window.
MEASURE: Click and drag to draw a line segment you wish to measure. If the history option is selected, the length of the line segment will be shown using the current scales; otherwise the information will appear in a new window.
SELECT AREA: Click and drag around the portion of the picture you wish to retain. This region will be rescaled to fit the current window.
DRAW SHAPE: This tool allows you to draw a curved shape of any kind to create your own shape to analyze. Simply click on the starting location, and continue to click on additional locations. A curved shape will be fitted to your points as you draw. If you use the NEW menu option you can start with a black image.

Other menu options will allow you to open your own image stored on your computer, to print the current window, hide/show the history window, to set the horizontal and vertical scales for the image, and to exit the program.

© 2006 Applet written by S. Keller, Department of Mathematics, Michigan State University

 
© 2006 Connected Mathematics Project, Michigan State University and Pearson
Education, Inc. publishing as Pearson Prentice Hall