'**SUMMARY**
Retrieve the bitmap (iplImage) of the Image.  This is useful if you want
to use functions from OpenCV with SimpleCV\'s image class
**RETURNS**
Returns black OpenCV IplImage from this image.
**EXAMPLE**
>>> img = Image("lenna")
>>> rawImg  = img.getBitmap()
>>> rawOut  = img.getEmpty()
>>> cv.SomeOpenCVFunc(rawImg,rawOut)
**SEE ALSO**
:py:meth:`getEmpty`
:py:meth:`getFPMatrix`
:py:meth:`getPIL`
:py:meth:`getNumpy`
:py:meth:`getGrayNumpy`
:py:meth:`getGrayscaleMatrix`'

def getBitmap(self):

    if self._bitmap:
        return self._bitmap
    elif self._matrix:
        self._bitmap = cv.GetImage(self._matrix)
    return self._bitmap
