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POAndroid YuvImage class format incorrect?
 

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  1. POAndroid YuvImage class format incorrect?
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    <p>It's well documented that Android's camera preview data is returned back in NV21 (YUV 420). 2.2 added a YuvImage class for decoding the data. The problem I've encountered is that the YuvImage class data appears corrupt or incorrect. I used the Renderscript Sample app called HelloCompute which transforms a Bitmap into a mono-chrome Bitmap. I used two methods for decoding the Preview data into a Bitmap and passing it as input to the Renderscript:</p> <p><strong>Method 1 - Android YuvImage Class:</strong></p> <p>YuvImage preview = new YuvImage(data, ImageFormat.NV21, width, height, null);</p> <p>ByteArrayOutputStream mJpegOutput = new ByteArrayOutputStream(data.length); </p> <p>preview.compressToJpeg(new Rect(0, 0, width, height), 100, mJpegOutput); mBitmapIn = BitmapFactory.decodeByteArray( mJpegOutput.toByteArray(), 0, mJpegOutput.size());</p> <p>// pass mBitmapIn to RS</p> <p><strong>Method 2 - Posted Decoder Method:</strong> As posted <a href="http://groups.google.com/group/android-developers/browse_thread/thread/c85e829ab209ceea/" rel="nofollow">over here by David Pearlman</a></p> <p>// work around for Yuv format </p> mBitmapIn = Bitmap.createBitmap( ImageUtil.decodeYUV420SP(data, width, height), width, height, Bitmap.Config.ARGB_8888);</p> <p>// pass mBitmapIn to RS</p> <p>When the image is processed by the Renderscript and displayed Method 1 is very grainy and not mono-chrome, while <em>Method 2 produces the expected output</em>, a mono-chrome image of the preview frame. Am I doing something wrong or is the YuvImage class not usable? I'm testing this on a Xoom running 3.1.</p> <p>Furthermore, I displayed the bitmaps produced by both methods on screen prior to passing to the RS. The bitmap from Method 1 has noticeable differences in lighting (I suspected this was due to the JPeg compression), while Method 2's bitmap is identical to the Preview Frame.</p>
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