ImageUtils { public static int detectBackgroundColor(BufferedImage b) { Map<Integer, Integer> map = colorCountMap(b); int max = 0; int max_color = toPixel(255, 255, 255); for (Integer color : map.keySet()) { if (map.get(color) > max) { max = map.get(color); max_color = color; } } return max_color; } private  ImageUtils(); static ImageComparedResult compare(BufferedImage image1, Rectangle imageArea1, BufferedImage image2,
			Rectangle imageArea2, CompareOption[] options); static boolean isContained(BufferedImage entireImage, BufferedImage partImage); static double[][] calcIntegralImage(BufferedImage source); static boolean imageEquals(BufferedImage image1, BufferedImage image2); static BufferedImage getMaskedImage(BufferedImage image, List<Rectangle> maskAreas); static BufferedImage getMarkedImage(BufferedImage image, DiffPoints diffPoints); static BufferedImage getDiffImage(BufferedImage leftImage, BufferedImage rightImage, DiffPoints diffPoints); static BufferedImage trim(BufferedImage image, int trimTop, int trimLeft, int trimBottom, int trimRight); static BufferedImage verticalMerge(List<BufferedImage> images); static BufferedImage merge(List<List<BufferedImage>> images); static int[] getRGB(BufferedImage image, int width, int height); static int[] toARGB(int pixel); static int toPixel(int[] argb); static int toPixel(int r, int g, int b); static int toPixel(int a, int r, int g, int b); static int detectBackgroundColor(BufferedImage b); static boolean getObjectRectangle(BufferedImage image, Rectangle rectangle); static double norm(int pixel1, int pixel2); static double[] countSubpixel(BufferedImage bimage); static void removeRedundantRectangles(List<Rectangle> rectangles, int xLimit, int yLimit); static void removeOverlappingRectangles(List<Rectangle> rectangles); static void reshapeRect(Rectangle rectangle, int xLimit, int yLimit); static Rectangle getTightDiffArea(Rectangle rectangle, int xLimit, int yLimit); static List<Rectangle> convertObjectGroupsToAreas(List<ObjectGroup> objectGroups); static List<ObjectGroup> convertDiffPointsToObjectGroups(DiffPoints DP, int group_distance); static BufferedImage getSubImage(BufferedImage image, Rectangle rectangle); static Offset findDominantOffset(BufferedImage expectedImage, BufferedImage actualImage, double diffThreshold); static BufferedImage getDominantImage(BufferedImage expectedImage, BufferedImage actualImage, Offset offset); static int getSizeRelationType(int expectedWidth, int expectedHeight, int actualWidth, int actualHeight);  }
@Test public void testDetectBackgroundColor() throws Exception { BufferedImage b = ImageIO.read(getClass().getResource("hifive_logo.png")); int expected = 0xfff5f4f4; int actual = ImageUtils.detectBackgroundColor(b); assertThat(actual, is(expected)); }