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Postsdbo
PO
 

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  1. PO
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    <p>Just send your 'Image' to BuildPixelArray function and then call the FindRegions. After that the 'colors' variable will be holding your colors list and pixel coordinates in every list member.</p> <p>I've copied the source from one of my projects, there may be some undefined variables or syntax erors.</p> <pre><code> public class ImageProcessing{ private int[,] pixelArray; private int imageWidth; private int imageHeight; List&lt;MyColor&gt; colors; public void BuildPixelArray(ref Image myImage) { imageHeight = myImage.Height; imageWidth = myImage.Width; pixelArray = new int[imageWidth, imageHeight]; Rectangle rect = new Rectangle(0, 0, myImage.Width, myImage.Height); Bitmap temp = new Bitmap(myImage); BitmapData bmpData = temp.LockBits(rect, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb); int remain = bmpData.Stride - bmpData.Width * 3; unsafe { byte* ptr = (byte*)bmpData.Scan0; for (int j = 15; j &lt; bmpData.Height; j++) { for (int i = 0; i &lt; bmpData.Width; i++) { pixelArray[i, j] = ptr[0] + ptr[1] * 256 + ptr[2] * 256 * 256; ptr += 3; } ptr += remain; } } temp.UnlockBits(bmpData); } public void FindRegions() { colors = new List&lt;MyColor&gt;(); for (int i = 0; i &lt; imageWidth; i++) { for (int j = 0; j &lt; imageHeight; j++) { int tmpColorValue = pixelArray[i, j]; MyColor tmp = new MyColor(tmpColorValue); if (colors.Contains(tmp)) { MyColor tmpColor = (from p in colors where p.colorValue == tmpColorValue select p).First(); tmpColor.pointList.Add(new MyPoint(i, j)); } else { tmp.pointList.Add(new MyPoint(i, j)); colors.Add(tmp); } } } } } public class MyColor : IEquatable&lt;MyColor&gt; { public int colorValue { get; set; } public List&lt;MyPoint&gt; pointList = new List&lt;MyPoint&gt;(); public MyColor(int _colorValue) { colorValue = _colorValue; } public bool Equals(MyColor other) { if (this.colorValue == other.colorValue) { return true; } return false; } } public class MyPoint { public int xCoord { get; set; } public int yCoord { get; set; } public MyPoint(int _xCoord, int _yCoord) { xCoord = _xCoord; yCoord = _yCoord; } } </code></pre>
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    1. POAlgorithm for finding a painted region on a canvas
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    1. USAhmet Kakıcı
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    1. COThat's very cool -- but it looks like it's giving me every point within a region. What I need to do is find the outline around a region.
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      1. USGeorge Johnston
    2. COOps misunderstood! Well i've written the code that you are asking for with c++ but i can't find it now. But you can still check the points at pointList if it's all neighboors are same color or not. If all neighboors are same color you may remove it, not so effective but just a trick.
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      1. USAhmet Kakıcı
    3. COBTW you can try sobel edge filter to findout outlines of the regions.
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      1. USAhmet Kakıcı
 

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