Hey there i am looking for the best practice to save a lot of images of type cvmat in the cache. What i dont understand it how and exactly when it will de allocate the memory of a mat.
How To Construct An Opencv Mat Object From C Arrays And
Cv mat memory management. Memory management of mat. First of all stdvector cvmat and other data structures used by the functions and methods have destructors that deallocate the underlying memory buffers when neededthis means that the destructors do not always deallocate the buffers as in case of mat. Opencv memory management of cvmat. After having a look at the monitoring i noticed that the ram of 5. Is it okay if i just pushback them in a vector mat and get back as soon as i need them. If i use a mat as follows.
And gets decreased when an instance goes out of scope. You do not need to think about memory management with opencvs c interface. Note that all 10000 mat objects are still allocated on the heap with 10000 finalizers when the program exists. The underlying matrix of an image may be copied using the cvmatclone and cvmatcopyto functions. Memory management is essential for an image class. Opencv handles all the memory automatically.
In opencv the image class is cvmat which has a delicate memory management scheme. This is about how you store the pixel values. To inspect native memory usage i will use valgrind. Reason for my question is that i tried to load 150 images 300 mb with imread and after 100 the system starts to slow down extremely. Cc isnt a garbage collected language like java so you need to manually release memory as soon as its use is over. Suppose i already have my own image class selfimage.
Keep in mind that qimage uses implicit data sharing so when assigning one qimage to another it keeps track of how many qimages are using the same data and releases it when nobody is using it. If youre new to opencv you need to know exactly how to manage all the huge amounts of memory youre using. Viewed 911 times 0. Automatic memory management opencv handles all the memory automatically. First of all stdvector mat and other data structures used by the functions and methods have destructors that. Calling matrelease did not garbage collect any of the mat objects again.
Ask question asked 4 years 4 months ago. Unlike conversions from cvmat however with conversions to cvmat we now have to be concerned about memory management. Active 4 years 4 months ago. The assignment operator and the copy constructor only copies the header. Cvmat holds an internal refcount which gets increased once you assigncopy it like mat ab. I am quite new to opencv and having some memory leaks in my application due to cvmat usage.
Gallery of Cv Mat Memory Management
