'**SUMMARY**
This method returns the top left corner of each feature\'s bounding box.
**RETURNS**
A numpy array of x,y position values.
**EXAMPLE**
>>> img = Image("./sampleimages/EdgeTest1.png")
>>> blobs = img.findBlobs()
>>> tl = img.bottomLeftCorners()
>>> print tl[0]'

def topLeftCorners(self):

    return np.array([f.topLeftCorner() for f in self])
