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POCrop image by polygon area
 

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    <p>I want to crop image by polygon area, but couldn`t find any library, which can make it. OpenCV is too big for this small thing. JJIL [<a href="https://code.google.com/p/jjil/" rel="nofollow noreferrer">enter link description here</a>] crop just rectangle area. Maybe you have any ideas how i can achieve it? Thanks for help!</p> <p><img src="https://i.stack.imgur.com/Ty1zh.jpg" alt="enter image description here"> <img src="https://i.stack.imgur.com/RPuMU.jpg" alt="enter image description here"></p> <p>FOR Nidhi: Try something like this, if doesnot work - create another canvas for path, and than get Bitmap from it (for mask), and apply this mask bitmap to your initial canvas instead drawPath.</p> <pre><code>Bitmap obmp = BitmapFactory.decodeResource(getResources(), R.drawable.image1); Bitmap resultImg = Bitmap.createBitmap(obmp.getWidth(), obmp.getHeight(), Bitmap.Config.ARGB_8888); Bitmap maskImg = Bitmap.createBitmap(obmp.getWidth(), obmp.getHeight(), Bitmap.Config.ARGB_8888); Canvas mCanvas = new Canvas(resultImg); Canvas maskCanvas = new Canvas(maskImg); Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); paint.setAntiAlias(true); paint.setStyle(Paint.Style.FILL);; paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); Path path = new Path(); path.moveTo(view.mx,view.my); path.lineTo(view.x1,view.y1); path.lineTo(view.x2,view.y2 ); path.lineTo(view.x3,view.y3); path.lineTo(view.x4,view.y4); path.close(); maskCanvas.drawPath(path, paint); mCanvas.drawBitmap(obmp, 0, 0, null); mCanvas.drawBitmap(maskImg, 0, 0, paint); </code></pre>
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    1. COWhat's your problems? It's quite simple: first - make mask filling by ones inside your area of interest, second - substitute all image pixels where mask==0 by some background value.
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    2. COThanks for advice man!
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    3. COHello ADK, actually I am newbie in android.And I am also finding the solution on how to crop image using a polygon. Can you give me some hint on how did you achieve this. Some hint will also help me lot.
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