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Our algorithm will follow the next sequence of steps: 1. Smooth the image. We do this to give us better transitions for the edges and less noise. 2. Find the edges of the image. We do this to give us the most potential lines. 3. Threshold the edges. We do this to separate softer edges into hard black-and-white edges. 4. Create an accumulator array of angles and distances (polar coordinates) for lines. This is a way of counting all possible lines. We use polar coordinates because the standard line equation, y = mx + b, has problems with vertical lines (that is, an infinite slope). 5. Move through the image pixel by pixel, looking for edge points. 6. When there is a hit, cycle through all possible lines at that point and increment the accumulator vote total by 1 for each angle and distance, while solving for the equation p = x * cos(theta) + y * sin(theta). 7. Convert the polar coordinates with the most votes back to Cartesian coordinates as representations of lines. (See Example 6-28 and Figure 6-24.) Example 6-28. getHoughLines.java public BufferedImage getHoughLines(BufferedImage srcImg) { double hough_thresh = .25; // since all points are being traversed, most lines will be found by // only moving through 90 degrees // also i only care about grid lines int angle_range = 90; // angular resolution int aRes = 1; int h = srcImg.getHeight(); int w = srcImg.getWidth(); // maximum radius of image is diagonal int pMax = (int) Math.sqrt((w * w) + (h * h)); int[][] acc = new int[pMax][angle_range]; // create accumulator // pre-process image srcImg = smooth(srcImg); srcImg = sobelGradMag(srcImg); srcImg = threshold(srcImg, 127, 255);

Note Although this discussion centers around overriding constructors, the techniques apply to all methods.

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To make the selection available to the outside either to actions, other TopComponents, or completely different modules we must take additional steps Use the helper class ExplorerUtils to define a Lookup using the createLookup() method, representing the selected node along with the selected node s Lookup Define this Lookup via the associateLookup() method as the TopComponent s local Lookup As a result, the Lookup is available from the outside, thanks to the global Lookup obtained via UtilitiesactionsGlobalContext() In the Nodes API section, we created Node and Children classes What remains missing is a window containing the explorer view that displays the node As you complete this missing step, you ll learn how the explorer view and the ExplorerManager relate to each other Start by using the Window Component wizard to create a new TopComponent named ExplorerTopComponent Next, add the ExplorerManager Do this by implementing ExplorerManager.

int maxPoints = 0; double totalPoints = 0; // move through image row by row from top to bottom for (int y = 0; y < h; ++y) { for (int x = 0; x < w; ++x) { int srcPixel = srcImg.getRGB(x, y); Color c = new Color(srcPixel); // build accumulator image // this will get the grey value of the image // even though i get red here, they are all same value. int colorValue = getGrey(c).getRed(); // if color is white, then we want to move through all // lines at this point if (colorValue == 255) { // moving through each line from zero to max angle // at resolution defined. for (int theta = 0; theta < angle_range; theta = theta + aRes) { // get the angle 0-90 double radians = (theta / 180.0) * Math.PI ; // get potential line // p = radius // radians = angle // x = x-coordinate // y = y-coordinate int p = (int) (Math.cos(radians) * x + Math .sin(radians) * y); // get absolute radius p = Math.abs(p); // add the accumulator at this angle and radius acc[p][theta] = acc[p][theta] + 1; // want to add the total points accumulated totalPoints = totalPoints + acc[p][theta]; // get the maximum number of points accumulated // for a particular bin if (acc[p][theta] > maxPoints) { maxPoints = acc[p][theta]; } } } } } // now work with the parameters space of the accumulator to find the x,y // coordinates of the lines // a = normalized to width // b = normalized height

If you find the title of this section a bit intimidating, relax. Calling the constructor of a superclass is, in fact, very easy (and useful). I ll start by giving you the solution to the problem posed at the end of the previous section: class SongBird(Bird): def __init__(self): Bird.__init__(self) self.sound = 'Squawk!' def sing(self): print self.sound

Provider and create a private instance of the ExplorerManager Then use getExplorerManager() to return the ExplorerManager Next, add an explorer view to the TopComponent In this case, we add a BeanTreeView A simple way of doing this is to drag and drop a JScrollPane onto the TopComponent, and then, switching to the Properties dialog, set Custom Code Creation in the Code tab to new BeanTreeView() Your initComponents() method will then look as shown in Listing 7-13 As pointed out earlier, the explorer view finds the ExplorerManager automatically, which means you need not take extra steps to connect the view to the ExplorerManager..

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