/ocr/ocrservice/src/com/googlecode/eyesfree/opticflow/OpticalFlow.java

 1/*
 2 * Copyright (C) 2011 Google Inc.
 3 *
 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 5 * use this file except in compliance with the License. You may obtain a copy of
 6 * 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, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations under
14 * the License.
15 */
16
17package com.googlecode.eyesfree.opticflow;
18
19import android.graphics.PointF;
20
21/**
22 * Interface to native optical flow library.
23 *
24 * Modified by Alan Viverette from Andrew Harp's original source.
25 *
26 * @author Andrew Harp
27 * @author alanv@google.com (Alan Viverette)
28 */
29public class OpticalFlow {
30    static {
31        System.loadLibrary("lept");
32        System.loadLibrary("opticalflow");
33    }
34
35    @Override
36    protected void finalize() {
37        resetNative();
38    }
39
40    public void initialize(int width, int height, int downsampleFactor) {
41        initNative(width, height, downsampleFactor);
42    }
43
44    public void setImage(byte[] data, long timestamp) {
45        addFrameNative(data, timestamp);
46    }
47
48    public void computeOpticalFlow() {
49        computeFeaturesNative(true);
50        computeFlowNative();
51        printInfoNative();
52    }
53
54    public float[] getFeatures(boolean onlyReturnCorrespondingFeatures) {
55        return getFeaturesNative(onlyReturnCorrespondingFeatures);
56    }
57
58    public PointF getAccumulatedDelta(
59            long timestamp, float positionX, float positionY, float radius) {
60        float[] delta = new float[2];
61
62        getAccumulatedDeltaNative(timestamp, positionX, positionY, radius, delta);
63
64        return new PointF(delta[0], delta[1]);
65    }
66
67    public void addInterestRegion(int numX, int numY, int left, int top, int right, int bottom) {
68        addInterestRegionNative(numX, numY, left, top, right, bottom);
69    }
70
71    /*********************** NATIVE METHODS *************************************/
72
73    private native void initNative(int width, int height, int downsampleFactor);
74
75    private native void addFrameNative(byte[] data, long timeStamp);
76
77    private native void computeFeaturesNative(boolean cachedOk);
78
79    private native void computeFlowNative();
80
81    private native void printInfoNative();
82
83    private native void getAccumulatedDeltaNative(
84            long timestamp, float positionX, float positionY, float radius, float[] delta);
85
86    private native void addInterestRegionNative(
87            int numX, int numY, float left, float top, float right, float bottom);
88
89    private native float[] getFeaturesNative(boolean onlyReturnCorrespondingFeatures);
90
91    private native void resetNative();
92}