Add deprecation warning in doc string to homography

skimage/transform/_project.pyx

@@ -35,8 +35,7 @@ cdef inline _matrix_transform(double x, double y, double* H, double *x_,
 
 def homography(np.ndarray image, np.ndarray H, output_shape=None, int order=1,
                mode='constant', double cval=0):
-    """
-    Projective transformation (homography).
+    """Projective transformation (homography).
 
     Perform a projective transformation (homography) of a
     floating point image, using bi-linear interpolation.

skimage/transform/_warps.py

@@ -74,7 +74,11 @@ def swirl(image, center=None, strength=1, radius=100, rotation=0,
 
 def homography(image, H, output_shape=None, order=1,
                mode='constant', cval=0.):
-    """Perform a projective transformation (homography) on an image.
+    """
+    .. deprecated::
+        0.7
+
+    Perform a projective transformation (homography) on an image.
 
     For each pixel, given its homogeneous coordinate :math:`\mathbf{x}
     = [x, y, 1]^T`, its target position is calculated by multiplying