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# 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 os
import os.path
def main():
"""Test that the android.tonemap.mode param is applied.
Applies different tonemap curves to each R,G,B channel, and checks
that the output images are modified as expected.
"""
NAME = os.path.basename(__file__).split(".")[0]
THRESHOLD_RATIO_MIN_DIFF = 0.1
THRESHOLD_DIFF_MAX_DIFF = 0.05
# The HAL3.2 spec requires that curves up to 64 control points in length
# must be supported.
L = 32
LM1 = float(L-1)
with its.device.ItsSession() as cam:
props = cam.get_camera_properties()
if not its.caps.compute_target_exposure(props):
print "Test skipped"
return
e, s = its.target.get_target_exposure_combos(cam)["midExposureTime"]
e /= 2
# Test 1: that the tonemap curves have the expected effect. Take two
# shots, with n in [0,1], where each has a linear tonemap, with the
# n=1 shot having a steeper gradient. The gradient for each R,G,B
# channel increases (i.e.) R[n=1] should be brighter than R[n=0],
# and G[n=1] should be brighter than G[n=0] by a larger margin, etc.
rgb_means = []
for n in [0,1]:
req = its.objects.manual_capture_request(s,e)
req["android.tonemap.mode"] = 0
req["android.tonemap.curveRed"] = (
sum([[i/LM1, min(1.0,(1+0.5*n)*i/LM1)] for i in range(L)], []))
req["android.tonemap.curveGreen"] = (
sum([[i/LM1, min(1.0,(1+1.0*n)*i/LM1)] for i in range(L)], []))
req["android.tonemap.curveBlue"] = (
sum([[i/LM1, min(1.0,(1+1.5*n)*i/LM1)] for i in range(L)], []))
cap = cam.do_capture(req)
img = its.image.convert_capture_to_rgb_image(cap)
its.image.write_image(
img, "%s_n=%d.jpg" %(NAME, n))
tile = its.image.get_image_patch(img, 0.45, 0.45, 0.1, 0.1)
rgb_means.append(its.image.compute_image_means(tile))
rgb_ratios = [rgb_means[1][i] / rgb_means[0][i] for i in xrange(3)]
print "Test 1: RGB ratios:", rgb_ratios
assert(rgb_ratios[0] + THRESHOLD_RATIO_MIN_DIFF < rgb_ratios[1])
assert(rgb_ratios[1] + THRESHOLD_RATIO_MIN_DIFF < rgb_ratios[2])
# Test 2: that the length of the tonemap curve (i.e. number of control
# points) doesn't affect the output.
rgb_means = []
for size in [32,64]:
m = float(size-1)
curve = sum([[i/m, i/m] for i in range(size)], [])
req = its.objects.manual_capture_request(s,e)
req["android.tonemap.mode"] = 0
req["android.tonemap.curveRed"] = curve
req["android.tonemap.curveGreen"] = curve
req["android.tonemap.curveBlue"] = curve
cap = cam.do_capture(req)
img = its.image.convert_capture_to_rgb_image(cap)
its.image.write_image(
img, "%s_size=%02d.jpg" %(NAME, size))
tile = its.image.get_image_patch(img, 0.45, 0.45, 0.1, 0.1)
rgb_means.append(its.image.compute_image_means(tile))
rgb_diffs = [rgb_means[1][i] - rgb_means[0][i] for i in xrange(3)]
print "Test 2: RGB diffs:", rgb_diffs
assert(abs(rgb_diffs[0]) < THRESHOLD_DIFF_MAX_DIFF)
assert(abs(rgb_diffs[1]) < THRESHOLD_DIFF_MAX_DIFF)
assert(abs(rgb_diffs[2]) < THRESHOLD_DIFF_MAX_DIFF)
if __name__ == '__main__':
main()
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