53 lines
1.3 KiB
C++
Executable File
53 lines
1.3 KiB
C++
Executable File
/*
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* Copyright 2012, 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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*/
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#ifndef LINEAR_REGRESSION_H_
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#define LINEAR_REGRESSION_H_
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#include <sys/types.h>
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#include <media/stagefright/foundation/ABase.h>
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namespace android {
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// Helper class to fit a line to a set of points minimizing the sum of
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// squared (orthogonal) distances from line to individual points.
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struct LinearRegression {
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LinearRegression(size_t historySize);
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~LinearRegression();
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void addPoint(float x, float y);
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bool approxLine(float *n1, float *n2, float *b) const;
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private:
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struct Point {
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float mX, mY;
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};
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size_t mHistorySize;
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size_t mCount;
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Point *mHistory;
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float mSumX, mSumY;
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DISALLOW_EVIL_CONSTRUCTORS(LinearRegression);
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};
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} // namespace android
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#endif // LINEAR_REGRESSION_H_
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