The G1 preview format is YUV 420 semi-planar (U and V are subsampled by 2 in both X and Y). The Y plane is first, followed by UV pairs - I believe the U sample comes first in the pair.
Technically it's YCbCr 420 semi-planar, but very few people use that term. On Nov 26, 6:27 pm, dmanpearl <[EMAIL PROTECTED]> wrote: > Hello Blindfold, > > Thanks for your help. I solved the user interface problems I was > experiencing by using a separate thread to do my image processing. I'm > still using an ImageView, and without problems. Perhaps I will try a > Canvas in a SurfaceHolder later in this exercise to compare speeds. > > MORE ON THE CAMERA LIVE PREVIEW FILTERED DISPLAY CAPABILITY > > As you know, I want to display live camera data through a custom > filter. > > I got most of the way through the YCbCr_422_SP data buffer returned to > Android's Camera.PreviewCallback onCameraFrame() callback function, > and now I am looking for help decyphering the U, V portion of the > buffer. I verified that the first (width*height) bytes are simple Y > luminance values that can be displayed (via Bitmap and ImageView) to > make a viable gray-scale image. The total number of bytes are (width > * height * 3 / 2). > > The remaining 1/2 image bytes are clearly used to store U, V (Cb, Cr) > data. Therefore, there are 1/4 image bytes for each U, V component > (i.e. each U, V component is used for 4 pixels of the image). This > looks like 411 or 420 data, not 422, but we have bigger fish to fry. > > I cannot determine if the U V data is aligned adjacently, in > alternating rows, or in squares as described in this Wikipedia > graphical description: http://en.wikipedia.org/wiki/Image:Yuv420.svg. > Once I finally determine the structure of the U, V data, I have > several equations to convert from YUV to RGB and I have tried many > ways of combining the UV data with the luminance data of the first 2/3 > of the buffer to no avail. So far I can only display mono-chrome. > > If you or others on this list can decode the Android YCbCr_422_SP > data, please post the solution as soon as possible. Your efforts and > generosity are greatly appreciated. I am convinced that > representatives from Google/Android and others monitoring this list > know how to do this. Please share the information. It is crutial to > our project. I do not care about the Emulator and it's different > encoding. I realize that Google is probably waiting to implement a > unified solution and share it through an API update, but we cannot > wait. > > - Thank you, David Manpearl > > On Nov 26, 10:23 am, blindfold <[EMAIL PROTECTED]> wrote: > > > Hi David, > > > > I can't seem to make coexist: SurfaceHolder for the camera & ImageView > > > for the filtered Bitmap to display. > > > ... > > > > Do you know why I can't make the Camera's Surface and an ImageView > > > Bitmap simultaneous members of the same active ViewGroup? > > > I do not use ImageView myself so I cannot really judge your problem. I > > draw my filtered Bitmap to a Canvas in a SurfaceView. No ImageView > > anywhere. > > > Regards --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com 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 -~----------~----~----~----~------~----~------~--~---
