Determine whether array represents data as unsigned 8-bit integers
Logical 1 (true) if the mxArray stores its data as unsigned 8-bit integers, and logical 0 (false) otherwise.
Use mxIsUint8 to determine whether the specified mxArray represents its real and imaginary data as 8-bit unsigned integers.
In C, calling mxIsUint8 is equivalent to calling:
mxGetClassID(pm) == mxUINT8_CLASS
In Fortran, calling mxIsUint8 is equivalent to calling:
mxGetClassName(pm) .eq. 'uint8'