Threshold filter

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Introduction

Used instruments: Threshold filter.

Objects of examination: Halftone image of the blood particles (Greyscale_picture.jpeg).

Task: to conduct the transformation of the halftone image into binary image and delete noises.
 
NOTE. Tutorial does not contain the information on all the possibilities of the application. Here the optimal way of solving the task set is offered.
 

Step 1. Launch of the application

Launch the Altami Studio application. In order to launch the application, use the Altami Studio shortcut at the workbench or the menu item Start→Programs→Altami Ltd→Altami Studio 3.0. Besides, the application can be launched from the folder where the application was installed (usually it is C:\Program Files\Altami Ltd\Altami Studio 3.0\).
 

Step 2. Opening the file

In Altami Studio application open the file with the image, in order to do that use the menu item File→Open and mark the Greyscale_picture.jpeg file. It is in Tutorials\Picturesfolder which is in the main folder of the application. Click the Open button.
 
The following image shall appear in the application window:
 
Opened document in Altami Studio application

Picture 1. Opened document in Altami Studio application

 

Step 3. Adding the Threshold filter to the document

In order to use the Threshold filter call the Filters panel through the Filters→Filters menu.
 
Opening the Filters panel

Image 2. Opening the Filters panel

 
Then at the appeared Filters panel click with the right button of the mouse, and at the context menu select Filters→Gray transformations→Threshold.
 
Adding Threshold filter
Image 3. Adding Threshold filter

 

Step 4. Adjusting the Threshold filter

By selecting the Threshold filter at the lower part of the Filters panel there appears a window with settings of this filter.
 
Threshold filter

Image 4. Threshold filter

 
Here you can turn on and turn off the filter having put and having put away the tick in the checkbox respectively near the enabled parameter.
 
The settings panel of the Threshold filter
Image 5. The settings panel of the Threshold filter

 
Leave the value of the newValue parameter as 255 by default. Indicate the value of the threshValue parameter as 155.00, as it is shown at the Image 6. Leave the value of the threshOperation parameter as ThreshBinary.
 

Image 6. Change of the value of the threshValue parameter

 
Change the value of the threshOperation parameter to ThreshBinary .
 
Action of the Threshold parameter by ThreshBinaryInv operation
Image 7. Action of the Threshold parameter by ThreshBinaryInv operation