How can I access pixel colors of camera pictures

jjoe64 · by **jjoe64** » Tue Dec 29, 2009 7:09 pm

hello.

When I capture a picture from camera I get the jpeg data:

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Using java Syntax Highlighting

 
public void onPictureTaken(byte[] data, Camera camera)
 
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How can I access pixel colors of camera pictures?

Is it possible to load the data array in a Bitmap-Object, because this class provides methods to access pixel (e.g. getPixel())? Or any other ideas?

Thanks.

nhenze · by **nhenze** » Mon Jan 11, 2010 5:33 pm

I use the following code snippet to extract the pixel data from taken photos. I scale the bitmap to use less memory. Since I don't know the default image format I also convert the bitmap to RGB565. Afterwards, the photo's pixel are in the ByteBuffer buffer. I alter this buffer and produce an OpenGL texture but you could also do other things if you like.

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public void onPictureTaken(byte[] jpeg, Camera camera) {
 
        Bitmap bitmap=BitmapFactory.decodeByteArray(jpeg, 0, jpeg.length);
 
        Bitmap scaledBitmap=Bitmap.createScaledBitmap(bitmap, 512, 384, false);
 
        scaledBitmap=scaledBitmap.copy(Bitmap.Config.RGB_565, false);
 
        Buffer buffer=ByteBuffer.allocateDirect(scaledBitmap.getWidth()*scaledBitmap.getHeight()*2);            
 
        scaledBitmap.copyPixelsToBuffer(buffer);
 
}
 
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How can I access pixel colors of camera pictures

How can I access pixel colors of camera pictures

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