'**SUMMARY**
Return the average color within the feature\'s radius
**RETURNS**
Returns an  RGB triplet that corresponds to the mean color of the feature.
**EXAMPLE**
>>> img = Image("lenna")
>>> kp = img.findKeypoints()
>>> c = kp[0].meanColor()'

def meanColor(self):

    if (self._avgColor is None):
        mask = self.image.getEmpty(1)
        cv.Zero(mask)
        cv.Circle(mask, (int(self.x), int(self.y)), int(self._r), color=(255, 255, 255), thickness=(-1))
        temp = cv.Avg(self.image.getBitmap(), mask)
        self._avgColor = (temp[0], temp[1], temp[2])
    return self._avgColor
