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2014/10/16 ¤W¤È 08:20:49
android Programming Glossary: onpreviewframeGetting frames from Video Image in Android http://stackoverflow.com/questions/1893072/getting-frames-from-video-image-in-android point it is not an easy thing to do. I've tried using the onPreviewFrame method with which you get the current frame as a byte array.. but it takes too long on a phone. Also I've read that the onPreviewFrame method has contraints on the runtime if it takes too long the.. this question Ok what we ended up doing is using the onPreviewFrame method and decoding the data in a seperate Thread using a method..
How to draw an overlay on a SurfaceView used by Camera on Android? http://stackoverflow.com/questions/2933882/how-to-draw-an-overlay-on-a-surfaceview-used-by-camera-on-android into a SurfaceView . What I'm trying to do is using the onPreviewFrame method which is invoked each time a new frame is drawn into.. camera.setPreviewCallback new PreviewCallback public void onPreviewFrame byte data Camera arg1 invalidar catch IOException e public..
Image processing with Android Camera http://stackoverflow.com/questions/4373254/image-processing-with-android-camera processing with Android Camera I want to use the onPreviewFrame to post process the image before displaying it to the user i.e...
How can I manipulate the camera preview? http://stackoverflow.com/questions/6478375/how-can-i-manipulate-the-camera-preview catch Exception e Log.e Camera e.getMessage public void onPreviewFrame byte data Camera camera Log.d Camera Got a camera frame Canvas..
Android Camera will not work. startPreview fails http://stackoverflow.com/questions/7942378/android-camera-will-not-work-startpreview-fails size.height targetHeight return optimalSize public void onPreviewFrame byte data Camera arg1 Debug.out PREVIEW FRAME byte pixels new.. e Log.d TAG Cannot start preview. e public void onPreviewFrame byte data Camera arg1 Log.d CameraSurfaceView PREVIEW FRAME.. rgb yp 3 2 byte b 10 You'll notice I commented out your onPreviewFrame method just to get it running and also the line context.surface_view.renderer..
Android: how to display camera preview with callback? http://stackoverflow.com/questions/8350230/android-how-to-display-camera-preview-with-callback to a bitmap. The relevant code is essentially public void onPreviewFrame byte data Camera camera int width int height int frameSize width..
Apply custom filters to camera output http://stackoverflow.com/questions/8371055/apply-custom-filters-to-camera-output implements PreviewCallback @Override public void onPreviewFrame byte data Camera camera final int len data.length for int i.. it manually. And you can't do any expensive operations in onPreviewFrame method beacause the lifetime of data is limited it's overwriten.. byte cameraFrame private byte buffer @Override public void onPreviewFrame byte data Camera camera cameraFrame data addCallbackBuffer data..
Converting YUV->RGB(Image processing)->YUV during onPreviewFrame in android? http://stackoverflow.com/questions/9325861/converting-yuv-rgbimage-processing-yuv-during-onpreviewframe-in-android YUV RGB Image processing YUV during onPreviewFrame in android I am capturing image using SurfaceView and getting.. and getting Yuv Raw preview data in public void onPreviewFrame4 byte data Camera camera I have to perform some image preprocessing.. camera I have to perform some image preprocessing in onPreviewFrame so i need to convert Yuv preview data to RGB data than image..
Getting frames from Video Image in Android http://stackoverflow.com/questions/1893072/getting-frames-from-video-image-in-android and process it as bitmap. From what I could find out to this point it is not an easy thing to do. I've tried using the onPreviewFrame method with which you get the current frame as a byte array and tried to decode it with the BitmapFactory class but it returns.. is a headerless YUV which could be translated to bitmap but it takes too long on a phone. Also I've read that the onPreviewFrame method has contraints on the runtime if it takes too long the application could crash. So what is the right way to do this.. the right way to do this java android camera share improve this question Ok what we ended up doing is using the onPreviewFrame method and decoding the data in a seperate Thread using a method which can be found in the android help group. decodeYUV..
How to draw an overlay on a SurfaceView used by Camera on Android? http://stackoverflow.com/questions/2933882/how-to-draw-an-overlay-on-a-surfaceview-used-by-camera-on-android I have a simple program that draws the preview of the Camera into a SurfaceView . What I'm trying to do is using the onPreviewFrame method which is invoked each time a new frame is drawn into the SurfaceView in order to execute the invalidate method which.. camera Camera.open try camera.setPreviewDisplay holder camera.setPreviewCallback new PreviewCallback public void onPreviewFrame byte data Camera arg1 invalidar catch IOException e public void invalidar invalidate public void surfaceChanged SurfaceHolder..
Image processing with Android Camera http://stackoverflow.com/questions/4373254/image-processing-with-android-camera processing with Android Camera I want to use the onPreviewFrame to post process the image before displaying it to the user i.e. apply a color tint sepia etc . As I understand the byte..
How can I manipulate the camera preview? http://stackoverflow.com/questions/6478375/how-can-i-manipulate-the-camera-preview isPreviewRunning false mCamera.release catch Exception e Log.e Camera e.getMessage public void onPreviewFrame byte data Camera camera Log.d Camera Got a camera frame Canvas c null if mHolder null return try synchronized mHolder ..
Android Camera will not work. startPreview fails http://stackoverflow.com/questions/7942378/android-camera-will-not-work-startpreview-fails targetHeight minDiff optimalSize size minDiff Math.abs size.height targetHeight return optimalSize public void onPreviewFrame byte data Camera arg1 Debug.out PREVIEW FRAME byte pixels new byte use_size.width use_size.height 3 decodeYUV420SP pixels.. mHolder mCamera.startPreview catch Exception e Log.d TAG Cannot start preview. e public void onPreviewFrame byte data Camera arg1 Log.d CameraSurfaceView PREVIEW FRAME byte pixels new byte use_size.width use_size.height 3 decodeYUV420SP.. b 262143 b 262143 rgb yp 3 byte b 6 rgb yp 3 1 byte b 2 rgb yp 3 2 byte b 10 You'll notice I commented out your onPreviewFrame method just to get it running and also the line context.surface_view.renderer renderer. I'm not familiar with the opengl..
Android: how to display camera preview with callback? http://stackoverflow.com/questions/8350230/android-how-to-display-camera-preview-with-callback the YUV pixels to RGB and then writing them directly to a bitmap. The relevant code is essentially public void onPreviewFrame byte data Camera camera int width int height int frameSize width height int rgba new int frameSize 1 Convert YUV to RGB..
Apply custom filters to camera output http://stackoverflow.com/questions/8371055/apply-custom-filters-to-camera-output new CameraGreenFilter public class CameraGreenFilter implements PreviewCallback @Override public void onPreviewFrame byte data Camera camera final int len data.length for int i 0 i len i data i 2 Although its name contains green I actually.. camera is not displaying preview at all you have to display it manually. And you can't do any expensive operations in onPreviewFrame method beacause the lifetime of data is limited it's overwriten on the next frame. One hint use setPreviewCallbackWithBuffer.. each frame. So you have to do something like this private byte cameraFrame private byte buffer @Override public void onPreviewFrame byte data Camera camera cameraFrame data addCallbackBuffer data actually addCallbackBuffer buffer has to be called once..
Converting YUV->RGB(Image processing)->YUV during onPreviewFrame in android? http://stackoverflow.com/questions/9325861/converting-yuv-rgbimage-processing-yuv-during-onpreviewframe-in-android YUV RGB Image processing YUV during onPreviewFrame in android I am capturing image using SurfaceView and getting Yuv Raw preview data in public void onPreviewFrame4 byte.. onPreviewFrame in android I am capturing image using SurfaceView and getting Yuv Raw preview data in public void onPreviewFrame4 byte data Camera camera I have to perform some image preprocessing in onPreviewFrame so i need to convert Yuv preview data.. Raw preview data in public void onPreviewFrame4 byte data Camera camera I have to perform some image preprocessing in onPreviewFrame so i need to convert Yuv preview data to RGB data than image preprocessing and back to Yuv data. I have used both function..
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