How do I read pixels from a PNG file?
Is this in Java? If so, you can use ImageIO.read( “yourImage.png” ) to get a BufferedImage. That will have a getData() method which will give you a Raster object, on which you can call getPixel. See link
image-capture
java.lang.OutOfMemoryError – BitmapFactory.decode(strPath)
You need to recycle Bitmap object . Bitmap bm = BitmapFactory.decodeFile(strPath); imageView.setImageBitmap(bm); After above lines of code in your get view just add the code written below ///now recycle your bitmap this will free up your memory on every iteration if(bm!=null) { bm.recycle(); bm=null; } After this also if you are getting same error the … Read more
How do I connect to a USB webcam in .NET? [closed]
You will need to use Windows Image Acquisition (WIA) to integrate a webcam with your application. There are plenty examples of this readily available. Here is a C# Webcam User Control with source. Here are some more articles and blog posts from people looking to solve the same problem you are: MSDN Coding4Fun: Look at … Read more
What is the best method to capture images from a live video device for use by a Java-based application?
This JavaCV implementation works fine. CODE: import com.googlecode.javacv.OpenCVFrameGrabber; import com.googlecode.javacv.cpp.opencv_core.IplImage; import static com.googlecode.javacv.cpp.opencv_highgui.*; public class CaptureImage { private static void captureFrame() { // 0-default camera, 1 – next…so on final OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0); try { grabber.start(); IplImage img = grabber.grab(); if (img != null) { cvSaveImage(“capture.jpg”, img); } } catch (Exception e) { … Read more
How to capture image from custom CameraView in Android?
try to use Surface View for creating dynamic camera view and set in your required portion. following code try variables set Class level (Global) Button btn_capture; Camera camera1; SurfaceView surfaceView; SurfaceHolder surfaceHolder; public static boolean previewing = false; Following code in onCreate() method getWindow().setFormat(PixelFormat.UNKNOWN); surfaceView = new SurfaceView(this); surfaceHolder = surfaceView.getHolder(); surfaceHolder.addCallback(this); surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); btn_capture = … Read more
Images taken with ACTION_IMAGE_CAPTURE always returns 1 for ExifInterface.TAG_ORIENTATION on some Gingerbread devices
Ok guys, it seems like this bug for android won’t be fixed for a while. Although I found a way to implement the ExifInformation so that both devices (ones with proper Exif tag, and also improper exif tags work together).. So the issue is on some (newer) devices, there’s a bug that makes the picture … Read more
How to capture UIView to UIImage without loss of quality on retina display
Switch from use of UIGraphicsBeginImageContext to UIGraphicsBeginImageContextWithOptions (as documented on this page). Pass 0.0 for scale (the third argument) and you’ll get a context with a scale factor equal to that of the screen. UIGraphicsBeginImageContext uses a fixed scale factor of 1.0, so you’re actually getting exactly the same image on an iPhone 4 as … Read more