如何设置相机的分辨率在Android中使用OpenCV的？ [英] How to set camera resolution in Android with OpenCV?
问题描述
我试图开发针对Android的应用程序，我需要得到的分辨率尽可能高的相机uncom pressed图片。我试图takePicture的rawCallback和postviewCallback，但他们没有工作。
I'm trying to develop an app for Android, and I would need to get uncompressed pictures with a resolution as high as possible from the camera. I tried takePicture's rawCallback and postviewCallback, but they are not working.
现在，我尝试使用VideoCapture的OpenCV（2.4版本），但我卡在默认960x720，这是可怜的我需要的东西;而我的电话，三星Galaxy S3，能够提供，理论上，最多8Mpx（3,264×2,448的照片，1,920×1080的视频，根据维基百科）。 VideoCapture.set（Highgui.CV_CAP_PROP_FRAME_WIDTH /身高，有的号码），使相机返回一个黑色图像，据我已经找到。
Right now I'm trying with OpenCV (version 2.4) using VideoCapture, but I'm stuck in the default 960x720, which is poor for what I need; and my phone, a Samsung Galaxy S3, is able to provide, theoretically, up to 8Mpx (3,264×2,448 for pictures, and 1,920×1,080 for video, according to Wikipedia). VideoCapture.set(Highgui.CV_CAP_PROP_FRAME_WIDTH/HEIGHT, some number) makes the camera return a black image as far as I've found.
有没有什么办法来获得更高的分辨率，无论是通过OpenCV的或与Android的API，无需COM pressing？
Is there any way to obtain a higher resolution, either through OpenCV or with the Android API, without compressing?
我真的很抱歉，如果这已经问过;我一直在寻找了几天，我发现什么。
I'm really sorry if this has been asked before; I have been looking for days and I have found nothing.
感谢您的时间！
编辑：虽然它不正是我一直在问，我发现有一种方法做一些非常相似：如果设置在previewCallback的摄像头，采用一套previewCallback，你做获得从相机（至少在S3我有工作）的原始图象数据。我离开这里，以防有人发现它在将来有用。
Although it is not exactly what I was asking, I found that there is a way to do something very similar: if you set an OnPreviewCallback for the Camera, using setPreviewCallback, you do get the raw picture data from the camera (at least in the S3 I'm working with). I leave it here in case somebody finds it useful in the future.
编辑：部分解决方案将在下面的答案解释。综上所述，
A partial solution is explained in an answer below. To sum up,
vc.set(Highgui.CV_CAP_PROP_FRAME_WIDTH, desiredFrameWidth);
vc.set(Highgui.CV_CAP_PROP_FRAME_HEIGHT, desiredFrameHeight);
工程在一定条件下;请参阅下面的进一步的细节。
works under some conditions; please see below for further detail.
推荐答案
您必须得到支持的摄像头preVIEW resoultions通过调用<一href="http://developer.android.com/reference/android/hardware/Camera.Parameters.html#getSupported$p$pviewSizes%28%29"相对=nofollow> getSupported previewSizes 。
You have to get supported camera preview resoultions by calling getSupportedPreviewSizes.
在此，您可以设置方法的任何决议<一href="http://developer.android.com/reference/android/hardware/Camera.Parameters.html#set$p$pviewSize%28int,%20int%29"相对=nofollow> 设置previewSize 。而且不要忘了<一href="http://developer.android.com/reference/android/hardware/Camera.html#setParameters%28android.hardware.Camera.Parameters%29"相对=nofollow> setParameters 到底。 Actally许多OpenCV的Android的例子包含该信息（看样本3）。
After this you can set any resolution with method setPreviewSize. And don't forget to setParameters in the end. Actally many OpenCV Android examples contain this information (look at sample3).
这篇关于如何设置相机的分辨率在Android中使用OpenCV的？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
