1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 #define LOG_NDEBUG 0
17
18 #define LOG_TAG "AutoLockTest"
19 #include <utils/Log.h>
20 #include <utils/Timers.h>
21 #include <cmath>
22 #include <string>
23
24 #include "vec2.h"
25 #include "vec3.h"
26 #include "autolocktest.h"
27
28 const float kOverExposure = 230.f;
29 const float kEqThreshold = 0.05f;
30 // Processes the color checker values and compare the two values from
31 // the same individual test.
processData()32 void AutoLockTest::processData() {
33 ALOGV("Start Processing Auto Lock Test Data!");
34
35 int numTests = mCheckerColors.size() / 2;
36 mNumPatches = 0;
37
38 if (numTests > 0) {
39 mNumPatches = mCheckerColors[0].size();
40 }
41
42 for (int i = 0; i < numTests; ++i) {
43 mComparisonResults.push_back(
44 IsBrighterThan((&mCheckerColors[i * 2]),
45 (&mCheckerColors[i * 2 + 1])));
46 mComparisonResults.push_back(
47 IsEquivalentTo((&mCheckerColors[i * 2]),
48 (&mCheckerColors[i * 2 + 1])));
49 }
50 }
51
52 // Compares whether one array of gray color patches is brighter than
53 // another one.
IsBrighterThan(const std::vector<Vec3f> * colorCheckers1,const std::vector<Vec3f> * colorCheckers2) const54 bool AutoLockTest::IsBrighterThan(
55 const std::vector<Vec3f>* colorCheckers1,
56 const std::vector<Vec3f>* colorCheckers2) const {
57 float meanRatio = 0.f;
58 int meanNumCount = 0;
59
60 for (int i = 0; i < mNumPatches; ++i) {
61 float luminance1 = (*colorCheckers1)[i].convertToLuminance();
62 float luminance2 = (*colorCheckers2)[i].convertToLuminance();
63
64 // Consider a 5% raise as a considerably large increase.
65 if ((luminance1 < kOverExposure) && (luminance2 != 0.f)) {
66 meanRatio += luminance1 / luminance2;
67 ++meanNumCount;
68 }
69 }
70 meanRatio = meanRatio / meanNumCount;
71
72 return (meanRatio > 1 + kEqThreshold);
73 }
74
75 // Compares whether one array of gray color patches is within a small range
76 // of the other one to be considered equivalent.
IsEquivalentTo(const std::vector<Vec3f> * colorCheckers1,const std::vector<Vec3f> * colorCheckers2) const77 bool AutoLockTest::IsEquivalentTo(
78 const std::vector<Vec3f>* colorCheckers1,
79 const std::vector<Vec3f>* colorCheckers2) const {
80 float meanRatio = 0.f;
81 int meanNumCount = 0;
82
83 for (int i = 0; i < mNumPatches; ++i) {
84 float luminance1 = (*colorCheckers1)[i].convertToLuminance();
85 float luminance2 = (*colorCheckers2)[i].convertToLuminance();
86 ALOGV("Luma_1 and Luma_2 is %f, %f", luminance1, luminance2);
87
88 if ((luminance1 < kOverExposure) && (luminance2 < kOverExposure)) {
89 meanRatio += luminance2 / luminance1;
90 ++meanNumCount;
91 }
92 }
93 meanRatio = meanRatio / meanNumCount;
94
95 return ((meanRatio >= 1 - kEqThreshold) && (meanRatio <= 1 + kEqThreshold));
96 }
97
clearData()98 void AutoLockTest::clearData() {
99 mCheckerColors.clear();
100 mComparisonResults.clear();
101 }
102