reset_obj_db — Initialization of the HALCON system.
reset_obj_db initializes the HALCON system.
With this operator the five relations (grayvalue data, region data, XLDs,
iconic objects and object tuplets) which are necessary for image
processing with HALCON will be installed (see also
In case the HALCON database was enabled
set_system('database','true')) and the relations already exist, all
data entries listed in the relations will get deallocated!
provide the initial values for the global maximum image size. If the first
created object is an image, (e.g.,
read_image), the set values
will only be overruled, if they are smaller than the size of the created
If on the other hand the first object to be created is a region,
the values will only be adjusted in case the new image is larger than the
This is not only the case for the first image which is created or
read: the global image size will always be enlarged, if larger images
The global image size is of consequence for the opening of windows
open_window) and the memory estimate and clipping of regions.
Whenever the clip mode is activated, regions will be clipped according
to the global image size (
This can lead to problems if images of various sizes are used.
In this case only the fact that a region is smaller or of the same size
as the largest image can be guaranteed.
DefaultChannels returns the most frequent
number of channels of an image object. This value can be set to 0 if
for the most part regions are used.
If more channels than those having been set at the initialization are
necessary for one image, the number will be enlarged dynamically for
If less channels than those having been set at the initialization are
necessary for the image, the superfluous channels will be set as
undefined. For the user this will seem as if they were non existent,
however, memory is allocated unnecessarily.
The parameter values can be queried using the operator
If the operator
reset_obj_db is not called at the beginning of a
HALCON session, HALCON will be initialized automatically by the operator
reset_obj_db(128,128,0) causing side effects on region clipping,
When the database was enabled by the parameter value 'database' of the
reset_obj_db will deallocate
all iconic objects.
Default image width (in pixels).
Default value: 128
Suggested values: 64, 128, 320, 640, 800, 1280
Default image height (in pixels).
Default value: 128
Suggested values: 64, 128, 240, 480, 600, 1024
Usual number of channels.
Default value: 0
Suggested values: 0, 1, 2, 3, 4, 5, 6, 7
reset_obj_db returns the value 2 (H_MSG_TRUE) if the
parameter values are correct.
Otherwise an exception will be raised.