Replace camera image with a CC0-licensed equivalent

doc/release/1.2.0-notes.rst

@@ -16,6 +16,11 @@ New features
 Backwards incompatible changes
 ==============================
 
+- The image returned by ``pywt.data.camera`` has been replaced by a similar,
+  CC0-licensed image because the original image was determined to only be
+  licensed for non-commercial use. Any users who still need the prior camera
+  image for non-commercial use can find it many places online by performing a
+  web search for "cameraman test image".
 
 Bugs Fixed
 ==========

pywt/data/_readers.py

@@ -90,6 +90,19 @@ def camera():
     camera : ndarray
        convenient image to use for testing and demonstration
 
+    Notes
+    -----
+    No copyright restrictions. CC0 by the photographer (Lav Varshney).
+
+    .. versionchanged:: 0.18
+        This image was replaced due to copyright restrictions. For more
+        information, please see [1]_, where the same change was made in
+        scikit-image.
+
+    References
+    ----------
+    .. [1] https://github.com/scikit-image/scikit-image/issues/3927
+
     Examples
     --------
     >>> import pywt.data

pywt/tests/test_data.py

@@ -30,13 +30,13 @@ def test_data_ascent():
 
 
 def test_data_camera():
-    ascent = pywt.data.camera()
+    camera = pywt.data.camera()
 
-    ref = np.array([[156, 157, 160],
-                    [156, 157, 159],
-                    [158, 157, 156]])
+    ref = np.array([[200, 200, 200],
+                    [200, 199, 199],
+                    [199, 199, 199]])
 
-    assert_allclose(ascent[:3, :3], ref)
+    assert_allclose(camera[:3, :3], ref)
 
 
 def test_data_ecg():