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