63 lines
2.4 KiB
Python
63 lines
2.4 KiB
Python
# Copyright 2013 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import its.image
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import its.caps
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import its.device
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import its.objects
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import its.target
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import os.path
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import math
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def main():
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"""Test that converted YUV images and device JPEG images look the same.
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"""
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NAME = os.path.basename(__file__).split(".")[0]
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THRESHOLD_MAX_RMS_DIFF = 0.01
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with its.device.ItsSession() as cam:
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props = cam.get_camera_properties()
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its.caps.skip_unless(its.caps.compute_target_exposure(props) and
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its.caps.per_frame_control(props))
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e, s = its.target.get_target_exposure_combos(cam)["midExposureTime"]
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req = its.objects.manual_capture_request(s, e, 0.0, True, props)
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# YUV
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size = its.objects.get_available_output_sizes("yuv", props)[0]
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out_surface = {"width":size[0], "height":size[1], "format":"yuv"}
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cap = cam.do_capture(req, out_surface)
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img = its.image.convert_capture_to_rgb_image(cap)
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its.image.write_image(img, "%s_fmt=yuv.jpg" % (NAME))
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tile = its.image.get_image_patch(img, 0.45, 0.45, 0.1, 0.1)
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rgb0 = its.image.compute_image_means(tile)
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# JPEG
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size = its.objects.get_available_output_sizes("jpg", props)[0]
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out_surface = {"width":size[0], "height":size[1], "format":"jpg"}
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cap = cam.do_capture(req, out_surface)
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img = its.image.decompress_jpeg_to_rgb_image(cap["data"])
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its.image.write_image(img, "%s_fmt=jpg.jpg" % (NAME))
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tile = its.image.get_image_patch(img, 0.45, 0.45, 0.1, 0.1)
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rgb1 = its.image.compute_image_means(tile)
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rms_diff = math.sqrt(
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sum([pow(rgb0[i] - rgb1[i], 2.0) for i in range(3)]) / 3.0)
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print "RMS difference:", rms_diff
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assert(rms_diff < THRESHOLD_MAX_RMS_DIFF)
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if __name__ == '__main__':
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main()
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