Use the Options > Count and Measure > Detection dialog box to make settings for the detection. You can find an overview of the Options > Count and Measure dialog box here.
After the detection has been performed, all pixels that are connected and belong to the same phase become a single object. When an object analysis is performed, objects in an image are analyzed on the basis of the current threshold value setting. The objects that have been analyzed are then displayed in color, on their own image layer. This image layer is called Detected Objects. Use the Layers tool window to make these image layers appear or disappear, or to delete them.
Description of the function groups
Borders - frame / Borders - ROI
See also
Overview - Automatic image analysis
Pixel connectivity
In the Pixel connectivity group, you define which pixels are to belong to an object.
Select the Adjacent borders (4) option when two pixels are only to belong to an object when they touch each other with one of their four sides.
Select the Include diagonals (8) option when two pixels are only to belong to an object when they touch each other via one of their four edges, or one of their diagonals.
Please note that this setting can has a very considerable effect on all of the results of the image analysis. This is because e.g., fewer image objects will be found when you use the Include diagonals (8) option.
The image object shown in gray, is made up of three pixels. Depending on the setting you make in the Pixel connectivity group, your software will count two different image objects (Adjacent borders, illustration on the left) or only a single image object (Include diagonals, illustration on the right).
Detection area
In the Detection area group, you specify whether the detection is to take the whole image into consideration, or only a specific area of the image (ROI).
Select the Frame option when the detection is to take place over the whole image.
Select the ROI option when the detection is only to be limited to a specific area of the image (ROI).
Alternatively, you can click the small black arrow next to the Count and Measure button, located in the Count and Measure tool window. Select the Count and Measure on ROI entry there.
See also
Carrying out an automatic image analysis on ROIs
Borders - frame / Borders - ROI
Here, you specify how the system is to handle objects which don't lie completely within the image or ROI. Depending on whether the detection is to be carried out over the complete image or only on a specific area, you set this either in the Borders - frame group, or in the Borders - ROI group.
Borders - frame
Make the settings in the Borders - frame group, when the detection is to be carried out over the complete image.
Select the Truncate option to specify that each object that is located on the border of the image is only to go into the measurement with the portion that is visible on the image. The rest of the object will be truncated.
Select the Exclude option, when every object that is located on the border of the image is to be completely ignored. That means that these objects will not, in any way, be taken into account.
Borders - ROI
Make the settings in the Borders - ROI group, when the detection is to be carried out on an ROI.
Select the Truncate option to specify that each object that is located on the border of the ROI is only to go into the measurement with the portion that lies within the ROI. The rest of the object will be truncated.
Select the Exclude option, when every object that is located on the border of the ROI is to be completely ignored.
Select the Include option, when every object that is located on the border of the ROI is to go into the measurement as a complete object. Please note that in this case the ROI has to be defined in such a way that the objects that the ROI cuts off have to be completely within the image.
Options
Minimum object size
In the Minimum object size field, enter the minimum number of pixels that an object must have, to be recognized as an object. Enter, for instance, the value 10 in this field, then only objects with an area of 10 or more pixels will be detected.
The smaller an object is, the greater the measurement inaccuracies will be. Very small objects are, anyway, often caused by slight fluctuations of intensity in the image e.g., noise, dirt or image defects, and are therefore, not genuine image objects.
Use this possibility to exclude very small objects from the analysis from the start.
Fill holes
Holes are connected intensity ranges, that lie completely within an object, but that don't belong to the object. When the object analysis is made, holes will be detected as such or will be ignored. The way holes are handled, has an effect on, among other things, the measured object surface.
Select the Fill holes check box, if holes are to be ignored, and in this way, evaluated as part of the objects.
Clear the check box Fill holes in order to detect holes within an object, as such.
It is possible to measure the number of holes in an object, or also to measure the area that the holes take up on an object. This is, however, only possible, if the Fill holes option has been cleared, because otherwise they would be evaluated as parts of the object.
To do this, use the Hole Count or the Hole Area measurement parameter. You can find these measurement parameters in the Select Object Measurement dialog box. You can find more information on this dialog box here.
Get from Active Image
Click the Get from Active Image button to have all of the settings of the Options > Count and Measure > Detection dialog box that were used for the analysis of the active image, restored. This button will only be active, when currently an image, on which an object analysis has already been performed, is active in the document group.
Use this button when you want to analyze another image with the same settings that you have already once defined for the active image.
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