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for a float image:

img.convertTo(img, CV_32F);

you get the mean and stdev:

Scalar m,d;
meanStdDev(img, m, d);

then you subtract the mean, and divide by stdev:

img -= m;
img /= d;

for a float image:

img.convertTo(img, CV_32F);

you get the mean and stdev:

Scalar m,d;
meanStdDev(img, m, d);

then you subtract the mean, and divide by stdev:

img -= m;
img /= d;
d; // but be careful, don't divide by zero here !