what is difference between cvcreatematheader() and cvcreatedata() ?

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C++

OpenCV

what is difference between cvcreatematheader() and cvcreatedata() ?
ihope explain difference with simple code

Posted 20-Sep-13 9:30am

Anderso0on

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Sergey Alexandrovich Kryukov 20-Sep-13 15:31pm

Such questions about "difference" are simple incorrect. What would you call a "difference"? If you can tell what it is, please tell us the difference between apple and Apple. :-)
Did you read the OpenCV documentation? What are your particular concerns about these functions?
—SA

Anderso0on 20-Sep-13 15:48pm

i read in opencv Doc cvcreatematheader just create structre to matrix and cvcreatedata allocate data and you can do this two functionality with cvcreatemat
but i did not understand cvcreatematheader and cvcreatedata exactly do

Richard C Bishop 20-Sep-13 15:32pm

Why not get book, read words, think with brain?

Sergey Alexandrovich Kryukov 20-Sep-13 16:24pm

Good idea... :-)
—SA

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CPallini · Accepted Answer · 2013-09-20T10:11:00

Solution 1

The documentation[^] (concisely) explains it all. For instance, it states that cvCreateMat is a just shortcut (or a 'convenience function') for the sequence

C++

CvMat* mat = cvCreateMatHeader(rows, cols, type);
cvCreateData(mat);

Posted 20-Sep-13 10:11am

CPallini

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Anderso0on 20-Sep-13 16:16pm

cvcreatedata() allocate what ??

Anderso0on 20-Sep-13 16:20pm

are you mean cvcreatemat header just allocate header part of strucure cvmat(such row ,col , step) and cvcreatedata allocate second part(union {uchar* ptr;short* s;int* i;float* fl;double* db;}) ??

Sergey Alexandrovich Kryukov 20-Sep-13 16:23pm

Agree, a 5.
—SA