'**SUMMARY**
Finds an edge map Image using the Canny edge detection method.  Edges will be brighter than the surrounding area.
The t1 parameter is roughly the "strength" of the edge required, and the value between t1 and t2 is used for edge linking.
For more information:
* http://opencv.willowgarage.com/documentation/python/imgproc_feature_detection.html
* http://en.wikipedia.org/wiki/Canny_edge_detector
**PARAMETERS**
* *t1* - Int - the lower Canny threshold.
* *t2* - Int - the upper Canny threshold.
**RETURNS**
A SimpleCV image where the edges are white on a black background.
**EXAMPLE**
>>> cam = Camera()
>>> while True:
>>>    cam.getImage().edges().show()
**SEE ALSO**
:py:meth:`findLines`'

def edges(self, t1=50, t2=100):

    return Image(self._getEdgeMap(t1, t2), colorSpace=self._colorSpace)
