org.opencv.android

Class Utils

java.lang.Object

org.opencv.android.Utils

public class Utils
extends Object

Constructor Summary

Constructors

Constructor and Description
Utils()

Method Summary

Modifier and Type	Method and 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

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

Constructor Detail

Utils

public Utils()

Method Detail

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'.