Package org.opencv.android

Class Utils

java.lang.Object
org.opencv.android.Utils
public class Utils extends Object

  • Constructor Summary

    Constructors
    Constructor
    Description
    Utils()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static void
    bitmapToMat(android.graphics.Bitmap bmp, Mat mat)
    Short form of the bitmapToMat(bmp, mat, unPremultiplyAlpha=false).
    static void
    bitmapToMat(android.graphics.Bitmap bmp, Mat mat, boolean unPremultiplyAlpha)
    Converts Android Bitmap to OpenCV Mat.
    static String
    exportResource(android.content.Context context, int resourceId)
     
    static String
    exportResource(android.content.Context context, int resourceId, String dirname)
     
    static Mat
    loadResource(android.content.Context context, int resourceId)
     
    static Mat
    loadResource(android.content.Context context, int resourceId, int flags)
     
    static void
    matToBitmap(Mat mat, android.graphics.Bitmap bmp)
    Short form of the matToBitmap(mat, bmp, premultiplyAlpha=false)
    static void
    matToBitmap(Mat mat, android.graphics.Bitmap bmp, boolean premultiplyAlpha)
    Converts OpenCV Mat to Android Bitmap.

    Methods inherited from class java.lang.Object

    equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Utils

      public Utils()

  • Method Details

    • exportResource

      public static String exportResource(android.content.Context context, int resourceId)

    • exportResource

      public static String exportResource(android.content.Context context, int resourceId, String dirname)

    • loadResource

      public static Mat loadResource(android.content.Context context, int resourceId) throws IOException
      Throws:
      IOException

    • loadResource

      public static Mat loadResource(android.content.Context context, int resourceId, int flags) throws IOException
      Throws:
      IOException

    • bitmapToMat

      public static void bitmapToMat(android.graphics.Bitmap bmp, Mat mat, boolean unPremultiplyAlpha)
      Converts Android Bitmap to OpenCV Mat.

      This function converts an Android Bitmap image to the OpenCV Mat.
      'ARGB_8888' and 'RGB_565' input Bitmap formats are supported.
      The output Mat is always created of the same size as the input Bitmap and of the 'CV_8UC4' type, it keeps the image in RGBA format.
      This function throws an exception if the conversion fails.

      Parameters:
      bmp - is a valid input Bitmap object of the type 'ARGB_8888' or 'RGB_565'.
      mat - is a valid output Mat object, it will be reallocated if needed, so it may be empty.
      unPremultiplyAlpha - is a flag, that determines, whether the bitmap needs to be converted from alpha premultiplied format (like Android keeps 'ARGB_8888' ones) to regular one; this flag is ignored for 'RGB_565' bitmaps.

    • bitmapToMat

      public static void bitmapToMat(android.graphics.Bitmap bmp, Mat mat)
      Short form of the bitmapToMat(bmp, mat, unPremultiplyAlpha=false).
      Parameters:
      bmp - is a valid input Bitmap object of the type 'ARGB_8888' or 'RGB_565'.
      mat - is a valid output Mat object, it will be reallocated if needed, so Mat may be empty.

    • matToBitmap

      public static void matToBitmap(Mat mat, android.graphics.Bitmap bmp, boolean premultiplyAlpha)
      Converts OpenCV Mat to Android Bitmap.


      This function converts an image in the OpenCV Mat representation to the Android Bitmap.
      The input Mat object has to be of the types 'CV_8UC1' (gray-scale), 'CV_8UC3' (RGB) or 'CV_8UC4' (RGBA).
      The output Bitmap object has to be of the same size as the input Mat and of the types 'ARGB_8888' or 'RGB_565'.
      This function throws an exception if the conversion fails.

      Parameters:
      mat - is a valid input Mat object of types 'CV_8UC1', 'CV_8UC3' or 'CV_8UC4'.
      bmp - is a valid Bitmap object of the same size as the Mat and of type 'ARGB_8888' or 'RGB_565'.
      premultiplyAlpha - is a flag, that determines, whether the Mat needs to be converted to alpha premultiplied format (like Android keeps 'ARGB_8888' bitmaps); the flag is ignored for 'RGB_565' bitmaps.

    • matToBitmap

      public static void matToBitmap(Mat mat, android.graphics.Bitmap bmp)
      Short form of the matToBitmap(mat, bmp, premultiplyAlpha=false)
      Parameters:
      mat - is a valid input Mat object of the types 'CV_8UC1', 'CV_8UC3' or 'CV_8UC4'.
      bmp - is a valid Bitmap object of the same size as the Mat and of type 'ARGB_8888' or 'RGB_565'.