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PODetect faces on an image captured in Android OpenCV java
 

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  1. PODetect faces on an image captured in Android OpenCV java
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    <p>When touch on the screen, this method is invoked, highgui.imwrite is suppose to overwrite the previous store into sdcard method.</p> <pre><code> public boolean onTouch(View v, MotionEvent event) { Log.i(TAG,"onTouch event"); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss"); String currentDateandTime = sdf.format(new Date()); String fileName = Environment.getExternalStorageDirectory().getPath() + "/sample_picture_" + currentDateandTime + ".jpg"; mOpenCvCameraView.takePicture(fileName); Toast.makeText(this, fileName + " saved", Toast.LENGTH_SHORT).show(); Mat a = Highgui.imread(fileName); MatOfRect faceDetections = new MatOfRect(); if (mDetectorType == JAVA_DETECTOR) { if (mJavaDetector != null) mJavaDetector.detectMultiScale(a, faceDetections); } else if (mDetectorType == NATIVE_DETECTOR) { if (mNativeDetector != null) mNativeDetector.detect(mGray, faceDetections); } else { Log.e(TAG, "Detection method is not selected!"); } for (Rect rect : faceDetections.toArray()){ Core.rectangle(a, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height), new Scalar(0, 255, 0)); Boolean bool = null; bool = Highgui.imwrite(fileName,a); if (bool == true) Log.d(TAG, "SUCCESS writing image to external storage"); else Log.d(TAG, "Fail writing image to external storage"); } return false; } </code></pre> <p>Then this method will create fileName for storing in external storage and takes the picture.</p> <pre><code>public void takePicture(final String fileName) { Log.i(TAG, "Taking picture"); this.mPictureFileName = fileName; // Postview and jpeg are sent in the same buffers if the queue is not empty when performing a capture. // Clear up buffers to avoid mCamera.takePicture to be stuck because of a memory issue mCamera.setPreviewCallback(null); // PictureCallback is implemented by the current class mCamera.takePicture(null, null, this); } </code></pre> <p>This method takes bytes array and store into sdcard.</p> <pre><code> public void onPictureTaken(byte[] data, Camera camera) { Log.i(TAG, "Saving a bitmap to file"); // The camera preview was automatically stopped. Start it again. mCamera.startPreview(); //... mCamera.setPreviewCallback(this); // Write the image in a file (in jpeg format) try { FileOutputStream fos = new FileOutputStream(mPictureFileName); fos.write(data); fos.close(); } catch (java.io.IOException e) { Log.e("PictureDemo", "Exception in photoCallback", e); } } </code></pre> <p>Now I believe I have converted to type Mat with highgui.imread(directory). But now I want to able to detect faces on that image with rectangle then store the image in sdcard using high.imwrite but when i open the image it does not have the rectangle on faces. Any idea or suggestions on what Im doing wrong? Any reply is greatly appreciated. Thank you. </p>
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    1. USPradeep Simha
    1. USMelvin
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    1. COHave you checked whether your `mNativeDetector.detect(mGray,faceDetections)' works as expected? Do **rect.x** and **rect.y** have valid values in relation to the face in the image?
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      1. PODetect faces on an image captured in Android OpenCV java
      1. USMahm00d
    2. COFirst off, thanks for replying and yes because it is able to detect face on live camera preview. Then now I want to be able to detect faces on a static image. I seem to have realize a problem is that. Highgui.imwrite fails to write a new image file. I am not sure why.
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      1. PODetect faces on an image captured in Android OpenCV java
      1. USMelvin
    3. COHave you also made sure to add writing permission to the manifest? `android.permission.WRITE_EXTERNAL_STORAGE`.
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      1. PODetect faces on an image captured in Android OpenCV java
      1. USMahm00d
 

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