1# Copyright 2013 The Android Open Source Project
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#      http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15import its.image
16import its.caps
17import its.device
18import its.objects
19import its.target
20import os.path
21import math
22
23def main():
24    """Test that converted YUV images and device JPEG images look the same.
25    """
26    NAME = os.path.basename(__file__).split(".")[0]
27
28    THRESHOLD_MAX_RMS_DIFF = 0.01
29
30    with its.device.ItsSession() as cam:
31        props = cam.get_camera_properties()
32        its.caps.skip_unless(its.caps.compute_target_exposure(props) and
33                             its.caps.per_frame_control(props))
34
35        e, s = its.target.get_target_exposure_combos(cam)["midExposureTime"]
36        req = its.objects.manual_capture_request(s, e, 0.0, True, props)
37
38        # YUV
39        size = its.objects.get_available_output_sizes("yuv", props)[0]
40        out_surface = {"width":size[0], "height":size[1], "format":"yuv"}
41        cap = cam.do_capture(req, out_surface)
42        img = its.image.convert_capture_to_rgb_image(cap)
43        its.image.write_image(img, "%s_fmt=yuv.jpg" % (NAME))
44        tile = its.image.get_image_patch(img, 0.45, 0.45, 0.1, 0.1)
45        rgb0 = its.image.compute_image_means(tile)
46
47        # JPEG
48        size = its.objects.get_available_output_sizes("jpg", props)[0]
49        out_surface = {"width":size[0], "height":size[1], "format":"jpg"}
50        cap = cam.do_capture(req, out_surface)
51        img = its.image.decompress_jpeg_to_rgb_image(cap["data"])
52        its.image.write_image(img, "%s_fmt=jpg.jpg" % (NAME))
53        tile = its.image.get_image_patch(img, 0.45, 0.45, 0.1, 0.1)
54        rgb1 = its.image.compute_image_means(tile)
55
56        rms_diff = math.sqrt(
57                sum([pow(rgb0[i] - rgb1[i], 2.0) for i in range(3)]) / 3.0)
58        print "RMS difference:", rms_diff
59        assert(rms_diff < THRESHOLD_MAX_RMS_DIFF)
60
61if __name__ == '__main__':
62    main()
63
64