OpenCV
4.9.0
Open Source Computer Vision
|
This tutorial will show you:
The following code creates two groups: Group1
and SubGroup1
, where SubGroup1
is a child of Group1
.
You can download the code from here or find it in the file modules/hdf/samples/create_groups.cpp
of the opencv_contrib source code library.
First, we create a HDF5 file
If the given file does not exist, it will be created. Otherwise, it is open for read and write.
Next, we create the group Group1
Note that we have to check whether /Group1
exists or not using the function cv::hdf::HDF5::hlexists() before creating it. You can not create a group with an existing name. Otherwise, an error will occur.
Then, we create the subgroup named Subgroup1
. In order to indicate that it is a sub group of Group1
, we have to use the group name /Group1/SubGroup1
:
Note that before creating a subgroup, we have to make sure that its parent group exists. Otherwise, an error will occur.
In the end, we have to close the file
There are many tools that can be used to inspect a given HDF file, such as HDFView and h5dump. If you are using Ubuntu, you can install them with the following commands:
There are also binaries available from the The HDF Group official website https://support.hdfgroup.org/HDF5/Tutor/tools.html.
The following figure shows the result visualized with the tool HDFView:
The output for h5dump
is: