| # Copyright 2013 The Android Open Source Project |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| import its.image |
| import its.caps |
| import its.device |
| import its.objects |
| import its.target |
| import pylab |
| import os.path |
| import matplotlib |
| import matplotlib.pyplot |
| |
| def main(): |
| """Test that the android.sensor.exposureTime parameter is applied. |
| """ |
| NAME = os.path.basename(__file__).split(".")[0] |
| |
| exp_times = [] |
| r_means = [] |
| g_means = [] |
| b_means = [] |
| |
| with its.device.ItsSession() as cam: |
| props = cam.get_camera_properties() |
| its.caps.skip_unless(its.caps.compute_target_exposure(props) and |
| its.caps.per_frame_control(props)) |
| |
| e,s = its.target.get_target_exposure_combos(cam)["midExposureTime"] |
| for i,e_mult in enumerate([0.8, 0.9, 1.0, 1.1, 1.2]): |
| req = its.objects.manual_capture_request(s, e * e_mult, True, props) |
| cap = cam.do_capture(req) |
| img = its.image.convert_capture_to_rgb_image(cap) |
| its.image.write_image( |
| img, "%s_frame%d.jpg" % (NAME, i)) |
| tile = its.image.get_image_patch(img, 0.45, 0.45, 0.1, 0.1) |
| rgb_means = its.image.compute_image_means(tile) |
| exp_times.append(e * e_mult) |
| r_means.append(rgb_means[0]) |
| g_means.append(rgb_means[1]) |
| b_means.append(rgb_means[2]) |
| |
| # Draw a plot. |
| pylab.plot(exp_times, r_means, 'r') |
| pylab.plot(exp_times, g_means, 'g') |
| pylab.plot(exp_times, b_means, 'b') |
| pylab.ylim([0,1]) |
| matplotlib.pyplot.savefig("%s_plot_means.png" % (NAME)) |
| |
| # Test for pass/fail: check that each shot is brighter than the previous. |
| for means in [r_means, g_means, b_means]: |
| for i in range(len(means)-1): |
| assert(means[i+1] > means[i]) |
| |
| if __name__ == '__main__': |
| main() |
| |