Android Open Source - miumo Rgb Motion Detection

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License

The source code is released under:

Apache License

Java Source Code

package com.miuno.motion_detection.detection;
/*from   w  ww  .j  a  v a2  s.  c om*/
import android.graphics.Color;


//import android.util.Log;


public class RgbMotionDetection implements IMotionDetection {

    // private static final String TAG = "RgbMotionDetection";

    // Specific settings
    private static final int mPixelThreshold = 50; // Difference in pixel (RGB)
    private static final int mThreshold = 10000; // Number of different pixels
                                                 // (RGB)

    private static int[] mPrevious = null;
    private static int mPreviousWidth = 0;
    private static int mPreviousHeight = 0;

    /**
     * {@inheritDoc}
     */
    @Override
    public int[] getPrevious() {
        return ((mPrevious != null) ? mPrevious.clone() : null);
    }

    protected static boolean isDifferent(int[] first, int width, int height) {
        if (first == null) throw new NullPointerException();

        if (mPrevious == null) return false;
        if (first.length != mPrevious.length) return true;
        if (mPreviousWidth != width || mPreviousHeight != height) return true;

        int totDifferentPixels = 0;
        for (int i = 0, ij = 0; i < height; i++) {
            for (int j = 0; j < width; j++, ij++) {
                int pix = (0xff & (first[ij]));
                int otherPix = (0xff & (mPrevious[ij]));

                // Catch any pixels that are out of range
                if (pix < 0) pix = 0;
                if (pix > 255) pix = 255;
                if (otherPix < 0) otherPix = 0;
                if (otherPix > 255) otherPix = 255;

                if (Math.abs(pix - otherPix) >= mPixelThreshold) {
                    totDifferentPixels++;
                    // Paint different pixel red
                    first[ij] = Color.RED;
                }
            }
        }
        if (totDifferentPixels <= 0) totDifferentPixels = 1;
        boolean different = totDifferentPixels > mThreshold;
        /*
         * int size = height * width; int percent =
         * 100/(size/totDifferentPixels); String output =
         * "Number of different pixels: " + totDifferentPixels + "> " + percent
         * + "%"; if (different) { Log.e(TAG, output); } else { Log.d(TAG,
         * output); }
         */
        return different;
    }

    /**
     * Detect motion comparing RGB pixel values. {@inheritDoc}
     */
    @Override
    public boolean detect(int[] rgb, int width, int height) {
        if (rgb == null) throw new NullPointerException();

        int[] original = rgb.clone();

        // Create the "mPrevious" picture, the one that will be used to check
        // the next frame against.
        if (mPrevious == null) {
            mPrevious = original;
            mPreviousWidth = width;
            mPreviousHeight = height;
            // Log.i(TAG, "Creating background image");
            return false;
        }

        // long bDetection = System.currentTimeMillis();
        boolean motionDetected = isDifferent(rgb, width, height);
        // long aDetection = System.currentTimeMillis();
        // Log.d(TAG, "Detection "+(aDetection-bDetection));

        // Replace the current image with the previous.
        mPrevious = original;
        mPreviousWidth = width;
        mPreviousHeight = height;

        return motionDetected;
    }
}

Java Source Code List

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