The following are instructions on how to run the applets which are part of the HIPR package. These applets are designed to allow the user to try out the operators which are outlined in the worksheets.
You may want to review the general instructions first, which gives a demonstration overview, JAVA details, browser details, known bugs, etc.
Source for this operator.
There is one pull down menu. It allows you to choose which of the three functions outlined in the HIPR page is used to calculate the local threshold value. Above this menu is a textbox into which can be entered an integer which specifies the size of the neighborhood which will be looked at when working out the local threshold value. For instance the default value of 7 will consider a 7x7 window centered on the current pixel. Below the pull down menu is another box called Constant value into which an integer value is entered. This is the value that is subtracted from the local threshold value before the threshold is applied to the local pixel.
This operator can take some time to execute.
The output is displayed to the right of the input image.
Pressing the green start button causes the operator to run. Pressing the Stop button causes the operator to stop running. This is useful if the system being run on is very slow and the operator is taking a long time to complete.
The time box shows the amount of time which the operator took to complete the process on the input image.
You can inspect the input and result image pixel values by depressing the left mouse button and moving the cursor over the desired pixel. The pixel coordinates and gray-level value are displayed underneath the image. Note that some images are larger than the displayed 256x256 display window. Larger images are subsampled in an appropriate manner.
You can find out about known problems with the system here.
©2003 R. Fisher, S. Perkins,
A. Walker and E. Wolfart.