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POAndroid - How crop jpeg using view layout dimensions
 

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  1. POAndroid - How crop jpeg using view layout dimensions
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    <p>Newbie user question:</p> <p>I have searched and experimented for several days and need some help. I have probably read every SO posting on this topic but I still cannot figure it out.</p> <p>I am trying to crop a specific area of a camera preview image. The issue is that the blue box is defined by a layout with top = 150 and left = 38, and height = 292 and width = 600. The image has height = 2448 and width = 3264.</p> <p>Big box is the camera preview screen, small box is the portion I want to crop (apparently I don't yet have the ability to post pictures).</p> <pre> ----------------------------- | | | | | | | --------- | | | | | | --------- | | | ----------------------------- </pre> <p>How do I crop the image so I am only left with the portion in the box? I'll be displaying it on another activity so I am not worried about that part.</p> <p>Just to complicate things, the box size and image size changes depending on the phone, and I need to work with API 8 (version 2.2, Froyo).</p> <p>I would also prefer not to save the image to a file because then I would have to encrypt it (the picture would be an image of a check for deposit).</p> <p>I am using Camera.takePicture() and the jpegCallback as in the following code snippet (initialBitmap would be the "big box" above, and rl would be the "small box"):</p> <pre><code> PictureCallback jpegCallback = new PictureCallback() { public void onPictureTaken(byte[] data, Camera camera) { if ( data != null &amp;&amp; data.length &gt; 0 ) { Bitmap initialBitmap = BitmapFactory.decodeByteArray(data, 0, data.length); int bitmapHeight = initialBitmap.getHeight(); int bitmapWidth = initialBitmap.getWidth(); // get the "picture" frame RelativeLayout rl = (RelativeLayout) findViewById( R.id.clear_layout ); int frameX = rl.getLeft(); int frameY = rl.getTop(); int frameHeight = rl.getHeight(); </code></pre> <p>Hopefully there is a simple mathematical relationship between the view coordinates/dimensions and the bitmap.</p> <p>I am also open to any better way to go about things but have tried to use the Preview data itself (too small) and manipulating the bitmap (out of memory errors).</p> <p>Thanks in advance.</p>
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    1. COIf you know the position of the box you want to get, why are you getting information from a relative layout? Why not just use the information at the start of the question and Bitmap.createBitmap(Bitmap source, int x, int y, int width, int height) to get the subsection in a new bitmap?
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    2. COEven though you said that have read everything image cropping, have you checked that answer? http://stackoverflow.com/a/9388244/1657165
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    3. COI understand how to crop an image. The issue I am having is I don't know the x, y, width, height in the image, based on the top, left, width, height of the RelativeLayout as shown on the activity layout. (i.e. the layout is 442 x 960 pixels but the jpeg picture is 2448 x 3264 pixels). What is the relationship? I've tried scaling but it seems that there is more picture outside of the preview that is causing the math to be off.
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