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The GSA Image Analyser is a program for the scientific evaluation of 2D images (image analysis). The possibilities of the program are varied and can be divided in three main groups:

* Object surface calculation
* Object length calculation
* Object counting

This menu item provides a tool for the manual counting of image objects. The current image file will be divided into subframes according to the setting given in field Cut after.

Figure 28. Setting for image cutting

Press the button Cut in order to cut the image and to reset the counter readings.

Figure 29. Cut and count

All subframes are listed in the left scrollbox. The active frame marked with a red border will be displayed on the work space. In the example shown in figure 29 the image was cut into 15 subframes. By means of the keys 5 (forward) and 4 (back) a change of the active subframe is possible. The counter will be updated by the keys + or -. All functions can be controlled over a popup menu.

Figure 30. Popup menu – right mouse button

Press the button Reset counter in order to reset the counter of the active subframe.

The total counter reading will be shown after reaching the last subframe.

With the help of this function the DPI parameters can be matched with the actual proportions. This will be necessary for instance if the magnification factor of a digital camera is unknown. An image containing a scale is needed here (see figure 31).

Figure 31. Image calibration by scale 1. Select calibration distance and unit 2. Press the left mouse button and go along the line 3. Press the button Finish