here's an example of the YUV conversion: http://blog.tomgibara.com/post/132956174/yuv420-to-rgb565-conversion-in-android
On Jul 1, 2:30 am, newbyca <[email protected]> wrote: > i'm working with the camera preview in my current project ... one > thing that has helped me out *a lot* is the zebra crossing (zx) code: > > http://code.google.com/p/zxing/source/browse/ > > specifically, zx parses a small region from the preview data to > determine if it contains a barcode. if a barcode is found, the region > is then passed around as a bitmap ... so your answer is *kinda* there. > i say *kinda* because its a little more complicated than that, and too > complicated to just post a code snippet ... or at least it is as far > as I know :) > > one thing you'll notice from the zx code is that the preview data is > not RGB color encoded. that is, if you read the preview data byte for > byte, it won't be laid out in simple frames of RGB triplets. in fact, > their code assumes the preview data is encoded using a YUV scheme > (http://en.wikipedia.org/wiki/YUV). this is normal for video\camera > equipment and a safe assumption. but the reason i bring it up is that > if you want to draw a bitmap using preview data, you must do it in > terms of RGB. i.e., you will have to translate from YUV to RGB at some > point. this translation isn't too hard tho ... the wiki contains the > formulas. > > HTH// > > On May 16, 6:53 am, "[email protected]" <[email protected]> wrote: > > > > > Hi there, > > > I need to capture an image from camera and display on surfaceview for > > my project. I am trying to obtain bitmap from data in onPreviewFrame > > method of previewCallback and display on surface using canvas. > > > Can someone please help me? > > > Following steps were done: > > > - created a Preview class extending SurfaceView and implementing > > SurfaceHolder.Callback set it as the content of activity. > > > - installed a SurfaceHolder.Callback in my Preview to get notified > > when the underlying surface is created and destroyed. > > mHolder = getHolder(); > > mHolder.addCallback(this); > > //mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); > > > - started a thread in surfaceCreated method described as follows: > > > public void run() { > > // Open the Camera > > camera = Camera.open(); > > > if (camera != null) { > > try { > > > > camera.setPreviewDisplay(mHolder); > > } catch (IOException e) { > > // TODO > > Auto-generated catch block > > e.printStackTrace(); > > } > > > camera.startPreview(); > > ImageCaptureCallback iccb = new > > ImageCaptureCallback (); > > camera.setPreviewCallback(iccb); > > } > > > ---------- > > > public class ImageCaptureCallback implements PreviewCallback { > > > public void onPreviewFrame(byte[] data, Camera camera) { > > //ToDo > > } > > > Please help. I can explain my problem in detail if anybody wish to > > solve it.... --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
