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 if not its.caps.compute_target_exposure(props): 33 print "Test skipped" 34 return 35 36 e, s = its.target.get_target_exposure_combos(cam)["midExposureTime"] 37 req = its.objects.manual_capture_request(s, e, True) 38 39 # YUV 40 size = its.objects.get_available_output_sizes("yuv", props)[0] 41 out_surface = {"width":size[0], "height":size[1], "format":"yuv"} 42 cap = cam.do_capture(req, out_surface) 43 img = its.image.convert_capture_to_rgb_image(cap) 44 its.image.write_image(img, "%s_fmt=yuv.jpg" % (NAME)) 45 tile = its.image.get_image_patch(img, 0.45, 0.45, 0.1, 0.1) 46 rgb0 = its.image.compute_image_means(tile) 47 48 # JPEG 49 size = its.objects.get_available_output_sizes("jpg", props)[0] 50 out_surface = {"width":size[0], "height":size[1], "format":"jpg"} 51 cap = cam.do_capture(req, out_surface) 52 img = its.image.decompress_jpeg_to_rgb_image(cap["data"]) 53 its.image.write_image(img, "%s_fmt=jpg.jpg" % (NAME)) 54 tile = its.image.get_image_patch(img, 0.45, 0.45, 0.1, 0.1) 55 rgb1 = its.image.compute_image_means(tile) 56 57 rms_diff = math.sqrt( 58 sum([pow(rgb0[i] - rgb1[i], 2.0) for i in range(3)]) / 3.0) 59 print "RMS difference:", rms_diff 60 assert(rms_diff < THRESHOLD_MAX_RMS_DIFF) 61 62if __name__ == '__main__': 63 main() 64 65