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POOpenCV 2.3: how to capture frames from Android camera?
 

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    <p>I'm trying to use new OpenCV feature on Android: native camera access. According to <a href="http://opencv.willowgarage.com/wiki/Android2.3.0#NativecamerasupportinOpenCV" rel="nofollow">this</a> document, it's quite easy, but I only get the error without success.</p> <p>There is DDMS log:</p> <blockquote> <p>08-26 03:28:56.825: DEBUG/CAMERA_ACTIVITY(12613): Library name: libopencv_java.so 08-26 03:28:56.825: DEBUG/CAMERA_ACTIVITY(12613): Library base address: 0x81800000 08-26 03:28:56.835: DEBUG/CAMERA_ACTIVITY(12613): Libraries folder found: /data/data/com.viactivity.ar/lib/ 08-26 03:28:56.835: DEBUG/CAMERA_ACTIVITY(12613): CameraWrapperConnector::connectToLib: folderPath=/data/data/com.viactivity.ar/lib/ 08-26 03:28:56.835: ERROR/CAMERA_ACTIVITY(12613): ||libnative_camera_r2.2.2.so 08-26 03:28:56.835: ERROR/CAMERA_ACTIVITY(12613): ||libnative_camera_r2.3.3.so 08-26 03:28:56.835: DEBUG/CAMERA_ACTIVITY(12613): try to load library 'libnative_camera_r2.2.2.so' 08-26 03:28:56.835: DEBUG/CAMERA_ACTIVITY(12613): CameraWrapperConnector::connectToLib ERROR: cannot dlopen camera wrapper library /data/data/com.viactivity.ar/lib/libnative_camera_r2.2.2.so, dlerror="Cannot load library: find_library[1223]: 11258 'libnative_camera_r2.2.2.so' failed to load previously" 08-26 03:28:56.835: DEBUG/CAMERA_ACTIVITY(12613): try to load library 'libnative_camera_r2.3.3.so' 08-26 03:28:56.835: DEBUG/CAMERA_ACTIVITY(12613): CameraWrapperConnector::connectToLib ERROR: cannot dlopen camera wrapper library /data/data/com.viactivity.ar/lib/libnative_camera_r2.3.3.so, dlerror="Cannot load library: find_library[1223]: 11258 'libnative_camera_r2.3.3.so' failed to load previously" 08-26 03:28:56.835: ERROR/CAMERA_ACTIVITY(12613): CameraWrapperConnector::connectToLib ERROR: cannot dlopen camera wrapper library 08-26 03:28:56.835: ERROR/CV_CAP(12613): Native_camera returned opening error: 4 08-26 03:28:56.835: ERROR/AR_code(12613): Capture Error!</p> </blockquote> <p>There are two variants of code:</p> <pre><code>CvCapture* capture = cvCaptureFromCAM( CV_CAP_ANDROID + 0 ); IplImage* frame = cvQueryFrame( capture ); cvReleaseCapture(&amp;capture); </code></pre> <p>.</p> <pre><code>cv::VideoCapture capture(CV_CAP_ANDROID + 0); cv::Mat frame; capture &gt;&gt; frame; </code></pre> <p>Both of them produce the same errors. Does somebody was able to get native camera access on Android? Thanks a lot!</p> <p><strong>UPD:</strong> The story above is about Android 3.2. According to the words of Andrey Kamaev, Android 3.2 isn't supported. I tried to test the same code on HTC Wildfire, but got another error:</p> <blockquote> <p>08-26 19:49:06.856: DEBUG/OpenCV_NativeCamera(1337): CameraHandler::initCameraConnect(0x813e65a1, 0, 0x285a20, 0x0) 08-26 19:49:06.856: DEBUG/CameraService(72): CameraService::connect E (pid 1337, client 0x693d8) 08-26 19:49:06.856: DEBUG/CameraService(72): CameraService::connect X (pid 1337, new client 0x693d8) rejected. (old pid 1337, old client 0x18728) 08-26 19:49:06.856: ERROR/OpenCV_NativeCamera(1337): initCameraConnect: Unable to connect to CameraService 08-26 19:49:06.856: ERROR/CAMERA_ACTIVITY(1337): CameraWrapperConnector::connectWrapper ERROR: the initializing function returned false 08-26 19:49:06.856: ERROR/CV_CAP(1337): Native_camera returned opening error: 6</p> </blockquote> <p>Any ideas?</p>
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    1. COWhat device do you use? What version of Android?
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    2. CODevice: Asus EEE Pad Transformer TF101, Android 3.2. If you need to run any debug code on it, you can send me packages to vitalys@gmail.com Thanks.
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    3. COFor HTC: check that standard camera application is able to show preview from camera. Error 6 usually means that camera is locked by another application and you need to find that app and make it to correctly release the camera or reboot the phone.
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