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      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 
     15 import its.image
     16 import its.caps
     17 import its.device
     18 import its.objects
     19 import its.target
     20 import os.path
     21 import math
     22 
     23 def main():
     24     """Test that the reported sizes and formats for image capture work.
     25     """
     26     NAME = os.path.basename(__file__).split(".")[0]
     27 
     28     THRESHOLD_MAX_RMS_DIFF = 0.03
     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         # Use a manual request with a linear tonemap so that the YUV and JPEG
     36         # should look the same (once converted by the its.image module).
     37         e, s = its.target.get_target_exposure_combos(cam)["midExposureTime"]
     38         req = its.objects.manual_capture_request(s, e, 0.0, True, props)
     39 
     40         rgbs = []
     41 
     42         for size in its.objects.get_available_output_sizes("yuv", props):
     43             out_surface = {"width":size[0], "height":size[1], "format":"yuv"}
     44             cap = cam.do_capture(req, out_surface)
     45             assert(cap["format"] == "yuv")
     46             assert(cap["width"] == size[0])
     47             assert(cap["height"] == size[1])
     48             print "Captured YUV %dx%d" % (cap["width"], cap["height"])
     49             img = its.image.convert_capture_to_rgb_image(cap)
     50             its.image.write_image(img, "%s_yuv_w%d_h%d.jpg"%(
     51                     NAME,size[0],size[1]))
     52             tile = its.image.get_image_patch(img, 0.45, 0.45, 0.1, 0.1)
     53             rgb = its.image.compute_image_means(tile)
     54             rgbs.append(rgb)
     55 
     56         for size in its.objects.get_available_output_sizes("jpg", props):
     57             out_surface = {"width":size[0], "height":size[1], "format":"jpg"}
     58             cap = cam.do_capture(req, out_surface)
     59             assert(cap["format"] == "jpeg")
     60             assert(cap["width"] == size[0])
     61             assert(cap["height"] == size[1])
     62             img = its.image.decompress_jpeg_to_rgb_image(cap["data"])
     63             its.image.write_image(img, "%s_jpg_w%d_h%d.jpg"%(
     64                     NAME,size[0], size[1]))
     65             assert(img.shape[0] == size[1])
     66             assert(img.shape[1] == size[0])
     67             assert(img.shape[2] == 3)
     68             print "Captured JPEG %dx%d" % (cap["width"], cap["height"])
     69             tile = its.image.get_image_patch(img, 0.45, 0.45, 0.1, 0.1)
     70             rgb = its.image.compute_image_means(tile)
     71             rgbs.append(rgb)
     72 
     73         max_diff = 0
     74         rgb0 = rgbs[0]
     75         for rgb1 in rgbs[1:]:
     76             rms_diff = math.sqrt(
     77                     sum([pow(rgb0[i] - rgb1[i], 2.0) for i in range(3)]) / 3.0)
     78             max_diff = max(max_diff, rms_diff)
     79         print "Max RMS difference:", max_diff
     80         assert(rms_diff < THRESHOLD_MAX_RMS_DIFF)
     81 
     82 if __name__ == '__main__':
     83     main()
     84 
     85