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      1 # Copyright 2014 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.device
     17 import its.objects
     18 import its.caps
     19 import os.path
     20 import numpy
     21 from matplotlib import pylab
     22 import matplotlib
     23 import matplotlib.pyplot
     24 
     25 def main():
     26     """Take long bursts of images and check that they're all identical.
     27 
     28     Assumes a static scene. Can be used to idenfity if there are sporadic
     29     frames that are processed differently or have artifacts, or if 3A isn't
     30     stable, since this test converges 3A at the start but doesn't lock 3A
     31     throughout capture.
     32     """
     33     NAME = os.path.basename(__file__).split(".")[0]
     34 
     35     BURST_LEN = 6
     36     BURSTS = 2
     37     FRAMES = BURST_LEN * BURSTS
     38 
     39     DELTA_THRESH = 0.1
     40 
     41     with its.device.ItsSession() as cam:
     42 
     43         # Capture at full resolution.
     44         props = cam.get_camera_properties()
     45         its.caps.skip_unless(its.caps.manual_sensor(props) and
     46                              its.caps.awb_lock(props))
     47         w,h = its.objects.get_available_output_sizes("yuv", props)[0]
     48 
     49         # Converge 3A prior to capture.
     50         cam.do_3a(lock_ae=True, lock_awb=True)
     51 
     52         # After 3A has converged, lock AE+AWB for the duration of the test.
     53         req = its.objects.fastest_auto_capture_request(props)
     54         req["android.blackLevel.lock"] = True
     55         req["android.control.awbLock"] = True
     56         req["android.control.aeLock"] = True
     57 
     58         # Capture bursts of YUV shots.
     59         # Build a 4D array, which is an array of all RGB images after down-
     60         # scaling them by a factor of 4x4.
     61         imgs = numpy.empty([FRAMES,h/4,w/4,3])
     62         for j in range(BURSTS):
     63             caps = cam.do_capture([req]*BURST_LEN)
     64             for i,cap in enumerate(caps):
     65                 n = j*BURST_LEN + i
     66                 imgs[n] = its.image.downscale_image(
     67                         its.image.convert_capture_to_rgb_image(cap), 4)
     68 
     69         # Dump all images.
     70         print "Dumping images"
     71         for i in range(FRAMES):
     72             its.image.write_image(imgs[i], "%s_frame%03d.jpg"%(NAME,i))
     73 
     74         # The mean image.
     75         img_mean = imgs.mean(0)
     76         its.image.write_image(img_mean, "%s_mean.jpg"%(NAME))
     77 
     78         # Compute the deltas of each image from the mean image; this test
     79         # passes if none of the deltas are large.
     80         print "Computing frame differences"
     81         delta_maxes = []
     82         for i in range(FRAMES):
     83             deltas = (imgs[i] - img_mean).reshape(h*w*3/16)
     84             delta_max_pos = numpy.max(deltas)
     85             delta_max_neg = numpy.min(deltas)
     86             delta_maxes.append(max(abs(delta_max_pos), abs(delta_max_neg)))
     87         max_delta_max = max(delta_maxes)
     88         print "Frame %d has largest diff %f" % (
     89                 delta_maxes.index(max_delta_max), max_delta_max)
     90         assert(max_delta_max < DELTA_THRESH)
     91 
     92 if __name__ == '__main__':
     93     main()
     94 
     95