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POExtract area detected by color using OpenCV in Android
 

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    <p>The sample project named "color-blob-detection" that comes with the openCV SDK for android can be used to identify an area of a particular color. What I require is to extract that area and save it into the phone memory as a bitmap.</p> <p>This is what I have understood so far:</p> <p>There is a list of contours:</p> <pre><code>List&lt;MatOfPoint&gt; contours = new ArrayList&lt;MatOfPoint&gt;(); </code></pre> <p>Contours are found using:</p> <pre><code>Imgproc.findContours(mDilatedMask, contours, mHierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE); </code></pre> <p>This finds the max contour area:</p> <pre><code>double maxArea = 0; Iterator&lt;MatOfPoint&gt; each = contours.iterator(); while (each.hasNext()) { MatOfPoint wrapper = each.next(); double area = Imgproc.contourArea(wrapper); if (area &gt; maxArea) maxArea = area; } </code></pre> <p>I would like to know how this largest area can be saved into the sdcard as a bitmap. Any help is greatly appreciated!</p> <p>//////EDIT</p> <p>This is used to draw Contours. I am not sure whether this is the correct way:</p> <pre><code> Imgproc.cvtColor(mDilatedMask, mDilatedMask, Imgproc.COLOR_GRAY2BGR); Imgproc.drawContours(mDilatedMask, contours, -1, new Scalar(0, 255, 0), 1); Toast.LENGTH_LONG).show(); Bitmap bmpOut = Bitmap.createBitmap(mDilatedMask.cols(), mDilatedMask.rows(), Bitmap.Config.ARGB_8888); Utils.matToBitmap(mDilatedMask, bmpOut); try { bmpOut.compress(CompressFormat.JPEG, 100, new FileOutputStream("/sdcard/mediaAppPhotos/bigrect.jpg")); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } </code></pre>
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