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you could use meanStdDev for this.

Mat m(5,5,CV_8U);
randu(m,0,100);

cerr << m << endl;
cerr << sum(m) << endl;

Scalar mea,dev;
meanStdDev( m,mea,dev );

cerr << mea << endl;
cerr << dev << endl;

[  6,  97,  39,  29,  97;
  10,  86,  93,  76,  29;
  51,  38,   7,  38,  75;
  23,  18,   1,  17,   3;
  53,  43,  75,  64,  48]
[1116, 0, 0, 0]
[44.64, 0, 0, 0]
[30.4353, 0, 0, 0]

you could use meanStdDev for this.

Mat m(5,5,CV_8U);
randu(m,0,100);

Rect roi(2,2,2,2);

cerr << m << endl;
cerr << sum(m) m(roi) << endl;

Scalar mea,dev;
meanStdDev( m,mea,dev m(roi), mea, dev );

cerr << mea << endl;
cerr << dev << endl;

[  6,  97,  39,  29,  97;
  10,  86,  93,  76,  29;
  51,  38,   7,  38,  75;
  23,  18,   1,  17,   3;
  53,  43,  75,  64,  48]
[1116, [  7,  38;
   1,  17]
[15.75, 0, 0, 0]
[44.64, 0, 0, 0]
[30.4353, [14.0601, 0, 0, 0]