How van I convert drawable to Mat?

[Csaba Bolyós]

Hi I was using 

Mat mLogo = new Mat();

mLogo = Highgui.imread("STRING TO FILE ON SDCARD");

But now I want to add that image to drawable, but I m unable to find the path or other method to create Mat from Drawable, or bitmap.

Thanks for any help

--
Bolyós Csaba

[Csaba Bolyós]

I have Find it out  

mLogo = Utils.loadResource(getContext(), R.drawable.slsp);

2011/12/9 Csaba Bolyós <blade...@gmail.com>

--
Bolyós Csaba

[Hardik]

Hi Csaba,


you can create bitmap from Mat using following method,,


Utils.matToBitmap(Mat,bitmap)


Thanks.....

--
Regards,

Pansuria Hardik

Sourcebits  Inc.

[Csaba Bolyós]

thanks

2011/12/9 Hardik <har...@sourcebits.com>

--
Bolyós Csaba

[Roman]

Hi, do you know any way to keep drawable aplha channel in mat?
Thanks, Roman

On 9 pro, 13:26, Csaba Bolyós <bladesza...@gmail.com> wrote:
> thanks
>
> 2011/12/9 Hardik <har...@sourcebits.com>
>
>
>
>
>
>
>
>
>
> > Hi Csaba,
>
> > you can create bitmap from Mat using following method,,
>
> > Utils.matToBitmap(Mat,bitmap)
>
> > Thanks.....
>

> > On Fri, Dec 9, 2011 at 4:21 PM, Csaba Bolyós <bladesza...@gmail.com>wrote:
>
> >> Hi I was using
>
> >> Mat mLogo = new Mat();
>
> >> mLogo = Highgui.imread("STRING TO FILE ON SDCARD");
>
> >> But now I want to add that image to drawable, but I m unable to find the
> >> path or other method to create Mat from Drawable, or bitmap.
>
> >> Thanks for any help
>
> >> --
> >> Bolyós Csaba
>
> > --
> > Regards,
>

> > *Pansuria Hardik
>
> > Sourcebits  Inc.
> > *
>
> --
> Bolyós Csaba

[Hardik]

Hi roman,

I dont get you,,, Can you explain me ??

--
Regards,

Pansuria Hardik

Android Developer

[Roman]

Hi Hardik,
I would like to load png with alpha channel into mat and keep the
alpha to show part from original matrix - maybe mask, or i dont know
exactly if its possible.
I detect object in image and wants to show non rectangle shaped image
with full opaque background on this position, if i load resource to
mat, alpha channel is lost and image has white background.

> *Pansuria Hardik
>
> Android Developer
>
> *

[Csaba Bolyós]

It is probably problem with the image, I load the image from drawables like R.drawable.myimage and display it like bitmap and it works fine.

as U can see it in the pictures

2011/12/10 Roman <hrusk...@gmail.com>

--
Bolyós Csaba

[Roman]

I use:
mFace = new Mat();
mFace = Utils.loadResource(context, R.drawable.faceicon); // faceicon
is PNG32 with alpha background

mROI = mRgba.submat(r); //r is rectangle with detected object
Imgproc.resize(mFace, mROI, mROI.size());
mFace.copyTo(mROI);

Do you get only position and draw drawable in some view over the
preview, or use mat too?
Thanks Csaba,
Roman

On 10 pro, 23:21, Csaba Bolyós <bladesza...@gmail.com> wrote:
> It is probably problem with the image, I load the image from drawables like
> R.drawable.myimage and display it like bitmap and it works fine.
>
> as U can see it in the pictures
>

> 2011/12/10 Roman <hruskozr...@gmail.com>

>  device-2011-12-09-132816.png
> 235KZobrazitStáhnout
>
>  device-2011-12-09-132848.png
> 264KZobrazitStáhnout

[Andrey Pavlenko]

Mat::copyTo() doesn't interpret the Mat's 4th channel as a mask (like Bitmaps processing functions do).

You need either to use Android API drawing methods instead or to extract alpha channel with Core.extractChannel() and to pass it as the 2nd argument to Mat::copyTo().

[Csaba Bolyós]

2011/12/11 Roman <hrusk...@gmail.com>

I use:
mFace = new Mat();
mFace = Utils.loadResource(context, R.drawable.faceicon); // faceicon
is PNG32 with alpha background

mROI = mRgba.submat(r); //r is rectangle with detected object
Imgproc.resize(mFace, mROI, mROI.size());
mFace.copyTo(mROI);

Do you get only position and draw drawable in some view over the
preview, or use mat too?

Only position

 

Thanks Csaba,
Roman

[danphuc2010]

help me!
i have code:

import org.opencv.android.Utils;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Scalar;
import org.opencv.imgproc.Imgproc;

import android.graphics.Bitmap;

public class Process {


public static Bitmap process1 (Bitmap bsrc){
Mat src = Utils.bitmapToMat(bsrc);
Mat dst = new Mat(src.cols(), src.rows(), CvType.CV_8UC1, new
Scalar(0));
Imgproc.cvtColor(src, dst,Imgproc.COLOR_RGB2GRAY,4);
Bitmap bdst = Bitmap.createBitmap(dst.cols(), dst.rows(),
Bitmap.Config.ARGB_8888);
Utils.matToBitmap(dst, bdst);
return bdst;
}
}
with opencv 2.3.1 and android version 2.2;
what is mistake?
thanks for anyone.

[Kirill Kornyakov]

And what is the problem? Compilation, linking, runtime error?

[danphuc2010]

umh, sorry.
when running, window must have a gray-picture, but it appear a small
window "sorry!" : The application BlurImage (process
com.example.blurimage) has stopped unexpectedly. Please try again.
what is it?
how to correct?

On Jan 10, 10:41 pm, Kirill Kornyakov <kirill.kornya...@itseez.com>
wrote:

[Andrey Pavlenko]

Mat src = Utils.bitmapToMat(bsrc); 
Mat dst = new Mat(); 
Imgproc.cvtColor(src, dst,Imgproc.COLOR_RGBA2GRAY);

Mat dstC4 = new Mat();  

Imgproc.cvtColor(dst,dstC4, Imgproc.COLOR_GRAY2RGBA, 4); 

Bitmap bdst = Bitmap.createBitmap(dstC4.cols(),  dstC4.rows(), Bitmap.Config.ARGB_8888); 
Utils.matToBitmap(dstC4, bdst); 
return bdst;