Plotting Image Histogram Using Androidplot - image
I m a beginner programmer, I am developing an android application which process an image and generate its histogram. I am using AndroidPlot to draw different color channels of an image in the histogram, but I'm having some errors and exceptions.
This is my code :
public class ImgHistogram extends Activity {
ImageView ImageView;
LinearLayout ll;
ImageView imgView;
private Bitmap source ;
private XYPlot xyPlot;
public XYSeries rSerie;
int[] intensities={
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,
101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,
201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255
} ;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.histo);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
imgView = (ImageView) findViewById(R.id.img);
Bundle bundle = this.getIntent().getExtras();
source=(Bitmap) bundle.getParcelable("img");
imgView.setImageBitmap(source);
// initialize our XYPlot reference:
xyPlot = (XYPlot) findViewById(R.id.xyplot);
Bitmap image = Bitmap.createBitmap(source.getWidth(),source.getHeight(), Bitmap.Config.ARGB_8888);
ArrayList<Integer> rVals = new ArrayList<Integer>();
for (int x = 0; x < image.getWidth(); x++) {
for (int y = 0; y < image.getHeight(); y++) {
int color = image.getPixel(x, y);
rVals.add((color >> 16) & 0xff); //red channel
}}
rSerie = new SimpleXYSeries(
rVals, SimpleXYSeries.ArrayFormat.Y_VALS_ONLY, "red channel");
// Create a formatter to format Line and Point of income series
LineAndPointFormatter format = new LineAndPointFormatter(
Color.rgb(0, 0, 255), // line color
Color.rgb(200, 200, 200), // point color
Color.rgb(10, 20, 20), // fill color (none)
null );
// add series to the xyplot:
xyPlot.addSeries(rSerie, format);
// Formatting the Domain Values ( X-Axis )
xyPlot.setDomainValueFormat(new Format() {
private static final long serialVersionUID = 1L;
#Override
public StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos) {
return new StringBuffer( intensities[ ( (Number)obj).intValue() ] );
}
#Override
public Object parseObject(String source, ParsePosition pos) {
return null;
}
});
xyPlot.setDomainLabel("");
xyPlot.setRangeLabel("");
// Increment X-Axis by 1 value
xyPlot.setDomainStep(XYStepMode.INCREMENT_BY_VAL, 1);
xyPlot.getGraphWidget().setRangeLabelWidth(50);
// Reduce the number of range labels
xyPlot.setTicksPerRangeLabel(2);
// Reduce the number of domain labels
xyPlot.setTicksPerDomainLabel(2);
// Remove all the developer guides from the chart
// xyPlot.disableAllMarkup();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
and this is the stack trace:
05-23 23:52:21.731: E/AndroidRuntime(30404): FATAL EXCEPTION: main
05-23 23:52:21.731: E/AndroidRuntime(30404): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dreamaker.magipixel/com.dreamaker.magipixel.processing.ImgHistogram}: java.lang.NullPointerException
05-23 23:52:21.731: E/AndroidRuntime(30404): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295)
05-23 23:52:21.731: E/AndroidRuntime(30404): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
05-23 23:52:21.731: E/AndroidRuntime(30404): at android.app.ActivityThread.access$700(ActivityThread.java:159)
05-23 23:52:21.731: E/AndroidRuntime(30404): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
05-23 23:52:21.731: E/AndroidRuntime(30404): at android.os.Handler.dispatchMessage(Handler.java:99)
05-23 23:52:21.731: E/AndroidRuntime(30404): at android.os.Looper.loop(Looper.java:137)
05-23 23:52:21.731: E/AndroidRuntime(30404): at android.app.ActivityThread.main(ActivityThread.java:5419)
05-23 23:52:21.731: E/AndroidRuntime(30404): at java.lang.reflect.Method.invokeNative(Native Method)
05-23 23:52:21.731: E/AndroidRuntime(30404): at java.lang.reflect.Method.invoke(Method.java:525)
05-23 23:52:21.731: E/AndroidRuntime(30404): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
05-23 23:52:21.731: E/AndroidRuntime(30404): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
05-23 23:52:21.731: E/AndroidRuntime(30404): at dalvik.system.NativeStart.main(Native Method)
05-23 23:52:21.731: E/AndroidRuntime(30404): Caused by: java.lang.NullPointerException
05-23 23:52:21.731: E/AndroidRuntime(30404): at com.dreamaker.magipixel.processing.ImgHistogram.onCreate(ImgHistogram.java:110)
05-23 23:52:21.731: E/AndroidRuntime(30404): at android.app.Activity.performCreate(Activity.java:5372)
05-23 23:52:21.731: E/AndroidRuntime(30404): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
05-23 23:52:21.731: E/AndroidRuntime(30404): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
05-23 23:52:21.731: E/AndroidRuntime(30404): ... 11 more
I hope that someone could help me!
Given the fact that in the line in question (ImgHistogram.java:110) you have only 1 object which could possibly cause the exception - xyPlot:
xyPlot.addSeries(rSerie, format);
This suggests that findViewByID returns null =< xyPlot is null. There is a question about this: findViewByID returns null the accepted answer should solve your problem:
Wait until onFinishInflate()
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The problem is because of Image [] images = new Image[9]; You are initializing an array of 9 elements and trying to insert 10 elements into it. images[9] = new Image(Flags.class.getResourceAsStream("images/flag9.gif")); represents the 9th index and the 10th element. Just increase the array size to 10 i.e. Image [] images = new Image[10]; A better option is to use an ArrayList if you are not sure of the size of the array. ArrayList resizes itself on element adding. Edit - as per user comments The NullPointerException is because you haven't initialized any of you ImageView's. Initialize the ImageView's before using them. for (ImageView imv1 : imv) { imv1 = new ImageView(); // Initialization imv1.setImage(images[rand.nextInt(9)]); } or you can directly use for (ImageView imv1 : imv) { imv1 = new ImageView(images[rand.nextInt(9)])); }
Can I put the renderscript memory allocation inside a loop to process a series of variable size arrays?
I am trying to modify the parallel reduction algorithm. I am using a logic to divide an given array length into powers of 2. For example if i put in the number 26, I make array 1 of 16 elements, the next array of 8 elements and the last array of 2 elements. Although 26 in itself is not a power of 2 but by this method i have more number of sub arrays created from the main array where each of them can be subjected to parallel reduction. but to be able to do this in rendercript i use a loop to each time rewrite the renderscript memory allocation while it has only one context but it is throwing me errors. can you help me in this part? point me to my blind spot? the following is my code! private void createScript() { log ("i'm in createscript"); int pp=0; int qq=1; int ii=0; **mRS = RenderScript.create(this);** for (int gstride=0; gstride < address.length/2; gstride++){ log("im in stride noof gstride:"+gstride); // this is the address array location int strtadd=address[ii]; int sze = 0; sze=address[qq]-address[pp]+1; tempin =new int [sze]; System.arraycopy(input, strtadd, tempin, 0, tempin.length); strtadd=address[ii+2]; log("Generated size of array: " + tempin.length); //renderscript declarations `enter code here`**mInAllocation=Allocation.createSized(mRS,Element.I32(mRS),tempin.length); `enter code here`mOutAllocation=Allocation.createSized(mRS,Element.I32(mRS),address.length/2); ` mInAllocation.copyFrom(tempin); mScript = new ScriptC_reduce2(mRS, getResources(), R.raw.reduce2); //int row_width = input.length; mScript.bind_gInarray(mInAllocation); mScript.set_gIn(mInAllocation); mScript.set_gOut(mOutAllocation); mScript.set_gScript(mScript); //time measurement long lStartTime = new Date().getTime(); for (int stride = tempin.length / 2; stride > 0; stride /= 2) { mScript.set_stride(stride); mScript.invoke_filter(); }** long lEndTime = new Date().getTime(); long difference = lEndTime - lStartTime; nettime[gstride]=difference; pp=pp+1; qq=qq+1; mInAllocation.copyTo(tempin); output[gstride] = tempin[0]; } int sum=0; int sum2=0; int i = 0; . while(i < output.length) { sum += output[i]; sum2 +=nettime[i]; i++; } t1.setText(String.format("output:%s\n\nExecution time:%s", +sum, +sum2 +"ms")); //input:%s\n\n ArrayToString(input), } I get the following error as copied from the error log: I don't think its out of memory ` `error. V/RenderScript( 2890): rsContextCreate dev=0x2a14ea68 V/ScriptC ( 2890): Create script for resource = reduce2 D/StopWatch( 2890): StopWatch bcc: RSCompilerDriver::loadScriptCache time (us): 1988 D/StopWatch( 2890): StopWatch bcc: RSCompilerDriver::build time (us): 2485 D/AndroidRuntime( 2890): Shutting down VM W/dalvikvm( 2890): threadid=1: thread exiting with uncaught exception (group=0x40a71930) E/AndroidRuntime( 2890): FATAL EXCEPTION: main E/AndroidRuntime( 2890): java.lang.RuntimeException: Unable to start activity `enter code `enter code here`ComponentInfo{com.example.paralleladd2/com.example.paralleladd2.Paralleladd2}:java.lang .NullPointerException E/AndroidRuntime( 2890): at `enter code here`android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) E/AndroidRuntime( 2890): at `enter code here`android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) E/AndroidRuntime( 2890): at android.app.ActivityThread.access$600(ActivityThread.java:141) E/AndroidRuntime( 2890): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) E/AndroidRuntime( 2890): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime( 2890): at android.os.Looper.loop(Looper.java:137) E/AndroidRuntime( 2890): at android.app.ActivityThread.main(ActivityThread.java:5041) E/AndroidRuntime( 2890): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime( 2890): at java.lang.reflect.Method.invoke(Method.java:511) E/AndroidRuntime( 2890): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) E/AndroidRuntime( 2890): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) E/AndroidRuntime( 2890): at dalvik.system.NativeStart.main(Native Method) E/AndroidRuntime( 2890): Caused by: java.lang.NullPointerException E/AndroidRuntime( 2890): at com.example.paralleladd2.Paralleladd2.createScript(Paralleladd2.java:157) E/AndroidRuntime( 2890): at com.example.paralleladd2.Paralleladd2.onCreate(Paralleladd2.java:48) E/AndroidRuntime( 2890): at android.app.Activity.performCreate(Activity.java:5104) E/AndroidRuntime( 2890): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) E/AndroidRuntime( 2890): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
Allocation creation should be fine inside the loop. I think your problem is coming from having the script creation inside the loop. I would create one reduce script outside your allocation creation loop and re-use it in the loop. Script creation is very resource intensive and could be running the system out of resources.
Fatal error when camera is initializing and back button is pressed or page navigating
I'm working on WP7/8 application with barcode scanning. And have a problem with disposing camera. Camera initialize too long, and when camera is still initializing and I press back button, I've got a fatal error: A first chance exception of type 'System.ObjectDisposedException' occurred in Microsoft.Devices.Camera.ni.dll WinRT information: Fatal error. Disposing capture device. Could anybody helps me how to avoid this error? my code: protected override void OnNavigatedTo(NavigationEventArgs e) { InitializeAndGo(); base.OnNavigatedTo(e); } protected override void OnNavigatingFrom(System.Windows.Navigation.NavigatingCancelEventArgs e) { disposeCamera(); } private void PhotoCameraOnInitialized(object sender, CameraOperationCompletedEventArgs cameraOperationCompletedEventArgs) { _width = Convert.ToInt32(_photoCamera.PreviewResolution.Width); _height = Convert.ToInt32(_photoCamera.PreviewResolution.Height); _luminance = new PhotoCameraLuminanceSource(_width, _height); if (_photoCamera.IsFlashModeSupported(FlashMode.Auto)) { _photoCamera.FlashMode = FlashMode.Off; } cameraInitialized = true; Dispatcher.BeginInvoke(() => { FlashCheckbox.IsEnabled = true; if (_photoCamera.IsFlashModeSupported(FlashMode.Auto)) { _photoCamera.FlashMode = FlashMode.Off; } }); _photoCamera.Focus(); } private void InitializeAndGo() { stopScan = false; _photoCamera = new PhotoCamera(); _photoCamera.Initialized += PhotoCameraOnInitialized; _photoCamera.AutoFocusCompleted += PhotoCameraOnAutoFocusCompleted; viewfinderBrush.SetSource(_photoCamera); _previewTransform.Rotation = _photoCamera.Orientation; _results = new ObservableCollection<Result>(); _barcodeReader = new BarcodeReader(); _barcodeReader.TryHarder = true; _barcodeReader.AutoRotate = true; _service = new MyMoviesDataService(ErrorDataService); } private void disposeCamera() { try { cameraInitialized = false; StopScan(); _photoCamera.Initialized -= PhotoCameraOnInitialized; _photoCamera.AutoFocusCompleted -= PhotoCameraOnAutoFocusCompleted; _photoCamera.Dispose(); _photoCamera = null; } catch (Exception ex) { App.ShowErrorToast(ex.Message); } }
Don't use the camera until it's been successfully initialized (You can check this in the camera's Initialized event). Also, wrap any usages of the camera in a try { // camera code here } catch (ObjectDisposedException) { // re-initialize the camera? } to handle situations like suspension, which will dispose of the camera automatically. As for the An exception of type 'System.ObjectDisposedException' occurred in Microsoft.Devices.Camera.ni.dll and wasn't handled before a managed/native boundary WinRT information: Fatal error. Disposing capture device. This is something Microsoft needs to fix; I mean, how are you supposed to handle a native code exception if it isn't allowed to propagate to managed code?
Where is the exception coming from (which code line / block)? I would for starter put a try...catch around InitializeAndGo() in the OnNavigatedTo event handler. And on the whole PhotoCameraOnInitialized event handler also. Cheers,