数据字节数组大小onPictureTaken和previewFrame不同 [英] data byte array size different for onPictureTaken and onPreviewFrame
问题描述
为什么数据字节数组大小onPictureTaken(字节[]数据,摄像头摄像头)和previewFrame(字节[]数据,摄像头摄像头)不同。前者有原始图像,因此给了我一个干净的形象,后者给了我一个像素化图像。我不使用onPictureTaken,因为它不会触发有时。
如果我的图像尺寸是1600×1400的屏幕尺寸为800×480
onPictureTaken给了我1600×1400
和
在previewFrame给了我800×480
这是我的code:
mCamera.setOneShot previewCallback(新相机。previewCallback(){
@覆盖
在previewFrame(字节[]数据,相机摄像头){公共无效
Camera.Parameters参数= camera.getParameters();
INT格式= parameters.get previewFormat();
// YUV格式需要更多的转换
如果(格式== || ImageFormat.NV21格式== || ImageFormat.YUY2格式== ImageFormat.NV16){
。INT W = parameters.get previewSize()宽度;
。INT H = parameters.get previewSize()高度;
//获取YUV图像
YuvImage yuv_image =新YuvImage(数据,格式,W,H,NULL);
}
我一直坚持这个问题的一个星期。
P.S。 - 在负面评价的情况下,请说明理由。
为什么数据字节数组大小onPictureTaken(字节[]数据,摄像头摄像头)和previewFrame(字节[]数据,摄像头摄像头)不同。
块引用>由于它们是具有在不同的编码不同的分辨率不同的图像。这将是一个小小的奇迹,如果他们的是的大小相同。
,前者具有原始图像,因此给了我一个干净的形象,后者给了我一个像素化图像
块引用>preVIEW帧通常是低质量的,因为它们需要在速度的高速率被捕获
我不使用onPictureTaken,因为它不会触发有时
块引用>虽然我也遇到过与相机API的许多问题,是不是其中之一。
在previewFrame给了我800×480
块引用>您指定<一的preVIEW分辨率href=\"http://developer.android.com/reference/android/hardware/Camera.Parameters.html#set$p$pviewSize%28int,%20int%29\"相对=nofollow>
集previewSize()
在Camera.Parameters
。Why is the data byte array size different for onPictureTaken(byte[] data, Camera camera) and onPreviewFrame(byte[] data, Camera camera). The former has the original image and hence gives me a clean image and the latter gives me a pixelated image. I am not using onPictureTaken because it does not get triggered sometimes. If my picture size is 1600 x 1400 and screen size is 800 x 480 onPictureTaken gives me 1600 x 1400 and onPreviewFrame gives me 800 x 480
This is my code:
mCamera.setOneShotPreviewCallback(new Camera.PreviewCallback() { @Override public void onPreviewFrame(byte[] data, Camera camera) { Camera.Parameters parameters = camera.getParameters(); int format = parameters.getPreviewFormat(); //YUV formats require more conversion if (format == ImageFormat.NV21 || format == ImageFormat.YUY2 || format == ImageFormat.NV16) { int w = parameters.getPreviewSize().width; int h = parameters.getPreviewSize().height; // Get the YuV image YuvImage yuv_image = new YuvImage(data, format, w, h, null); }
I have been stuck with this issue for one week.
P.S. - In case of negative ratings please state the reason
解决方案Why is the data byte array size different for onPictureTaken(byte[] data, Camera camera) and onPreviewFrame(byte[] data, Camera camera).
Because they are different images with different resolutions in different encodings. It would be a minor miracle if they were the same size.
The former has the original image and hence gives me a clean image and the latter gives me a pixelated image
Preview frames are generally of lower quality, because they need to be captured at a high rate of speed.
I am not using onPictureTaken because it does not get triggered sometimes
While I have encountered many problems with the camera APIs, that is not one of them.
onPreviewFrame gives me 800 x 480
You specify the preview resolution in
setPreviewSize()
onCamera.Parameters
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