opencv/interfaces/swig/python/imagedata.i

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// 2004-03-16, Gabriel Schreiber <schreiber@ient.rwth-aachen.de>
//             Mark Asbach       <asbach@ient.rwth-aachen.de>
//             Institute of Communications Engineering, RWTH Aachen University

// 2006-08-29  Roman Stanchak -- converted to use CvMat rather than IplImage


%{

/// Accessor to convert a Python string into the imageData.
void CvMat_imageData_set(CvMat * self, PyObject* object)
{
	char* py_string = PyString_AsString(object);
	int depth = CV_MAT_DEPTH(self->type);
	int cn = CV_MAT_CN(self->type);

	int step = self->step ? self->step : CV_ELEM_SIZE(self->type) * self->cols;

	if (depth == CV_8U && cn==3){
		// RGB case
		// The data is reordered beause OpenCV uses BGR instead of RGB

		for (long line = 0; line < self->rows; ++line)
			for (long pixel = 0; pixel < self->cols; ++pixel)
			{
				// In OpenCV the beginning of the lines are aligned
				// to 4 Bytes. So use step instead of cols.
				long position = line*step + pixel*3;
				long sourcepos = line*self->cols*3 + pixel*3;
				self->data.ptr[position  ] = py_string[sourcepos+2];
				self->data.ptr[position+1] = py_string[sourcepos+1];
				self->data.ptr[position+2] = py_string[sourcepos  ];
			}
	}
	else if (depth == CV_8U && cn==1)
	{
		// Grayscale 8bit case

		for (long line = 0; line < self->rows; ++line)
		{
			// In OpenCV the beginning of the lines are aligned
			// to 4 Bytes. So use step instead of cols.
			memcpy
				(
				 self->data.ptr + line*step,
				 py_string + line*self->cols,
				 step
				);
		}
	}
	else if ( depth == CV_32F )
	{
		// float (32bit) case
		for (long line = 0; line < self->rows; ++line)
		{
			// here we don not have to care about alignment as the Floats are
			// as long as the alignment
			memcpy
				(
				 self->data.ptr + line*step,
				 py_string + line*self->cols*sizeof(float),
				 step
				);
		}
	}
	else if ( depth == CV_64F )
	{
		// double (64bit) case
		for (long line = 0; line < self->rows; ++line)
		{
			// here we don not have to care about alignment as the Floats are
			// as long as the alignment
			memcpy
				(
				 self->data.ptr + line*step,
				 py_string + line*self->cols*sizeof(double),
				 step
				);
		}
	}
	else
	{
	  // make some noise
	  SendErrorToPython (SWIG_TypeError,
                       "CvMat_imageData_set",
                       "cannot convert string data to this image format",
                       __FILE__, __LINE__, NULL);
	}
}

/// Accessor to convert the imageData into a Python string.
PyObject* CvMat_imageData_get(CvMat * self)
{
	if (!self->data.ptr)
	{
		PyErr_SetString(PyExc_TypeError, "Data pointer of CvMat is NULL");
		return NULL;
	}


	int step = self->step ? self->step : CV_ELEM_SIZE(self->type) * self->cols;
	return PyString_FromStringAndSize((const char *)self->data.ptr, self->rows*step);
}

%}

// add virtual member variable to CvMat
%extend CvMat {
	PyObject * imageData;
};