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    <p>you need a difference filter:</p> <p>1) you calc the horizontal difference (here you'll have vertical segments)</p> <p>2) you calc the vertical difference (here, horizontal segments)</p> <p>3) you OR the two maps, finding the outlines</p> <p>4) recreate a Bitmap object, if you wish to do so</p> <p>something like (EDITED):</p> <pre><code>int[] pixels; int width = yourbitmap.getWidth(); int height = yourbitmap.getHeight(); yourbitmap.getPixels(pixels, 0, width, 0, 0, width, height); // transform grayscale int[] image = new int[width*height]; for (int y=0; y&lt;height; y++) for (int x=0; x&lt;width; x++) { int pixel = image[y*width + x]; image[y*width + x] = (Color.red(pixel) + Color.green(pixel) + Color.blue(pixel))/3; } // calculate diff_x (vertical segments) int[] dx = new int[width*height]; for (int y=0; y&lt;height; y++) for (int x=0; x&lt;width; x++) dx[y*width + x] = (x==0 || y== 0 ? 0 : Math.abs(image[y*width + x] - image[y*width + x-1])); // calculate diff_y (horizontal segments) int[] dy = new int[width*height]; for (int y=0; y&lt;height; y++) for (int x=0; x&lt;width; x++) dy[y*width + x] = (x==0 || y== 0 ? 0 : Math.abs(image[y*width+x] - image[(y-1)*width+x])); // when the color intensity is higher than THRESHOLD, accept segment // you'll want a slider to change THRESHOLD values bool[] result = new bool[width*height]; const int THRESHOLD = 60; // adjust this value for (int y=0; y&lt;height; y++) for (int x=0; x&lt;width; x++) result[y*width + x] = (dx[y*width + x] &gt; THRESHOLD || dy[y*width + x] &gt; THRESHOLD); Bitmap result = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); for (int y=0; y&lt;height; y++) for (int x=0; x&lt;width; x++) result.setPixel(x, y, result[y*width+x]? Color.Black : Color.White); </code></pre>
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    1. POHow to convert an image into tattoo?
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    1. COhow to calculate horizontal difference and vertical difference for bitmap
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    2. COthe posted code should calculate both the differences and the final OR, the only thing missing is the conversion bitmap->byte[][]matrix. I don't know much of android, but i think that Bitmap.getPixels(...) should do the trick
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    3. COsorry,its not working in android the bitmap is converting to byte[]matrix only and its not converting to byte[][]matrix and also here the image.x and image.y are not recognized...could u give the clear explonation
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