Re: [Cvcell-devel] Submiting a region mask

[Hiroki S. <hi...@ea...>]

Hello,

>>>>> In <483...@gm...> 
>>>>>	Flavio Percoco Premoli <fla...@gm...> wrote:

> > CVAPI(void)  cvGoodFeaturesToTrack( const CvArr* image, CvArr* eig_image,
> >                                     CvArr* temp_image, CvPoint2D32f* corners,
> >                                     int* corner_count, double  quality_level,
> >                                     double  min_distance,
> >                                     const CvArr* mask CV_DEFAULT(NULL),
> >                                     int block_size CV_DEFAULT(3),
> >                                     int use_harris CV_DEFAULT(0),
> >                                     double k CV_DEFAULT(0.04) );

> Not exactly, the thing is that i don't know what should i pass to the 
> mask, i tried passing an array [X,Y], then i tried with a cv point 
> cv.cvPoint( X, Y ) and nothing. what i don't know is what type of data 
> is this:

> const CvArr* mask CV_DEFAULT(NULL)

> Or how do i convert my X and Y points to a region.

In this case, a "CvArr* mask" is a image such as IplImage or CvMat.
First you must create the black image such as

      IplImage* mask = cvCreateImage(cvGetSize(input_image),
                                     input_image->depth, input_image->nChannels);
      cvZero( mask );

Next you draw the specified region on the image "mask".
Non-zero pixels indicate the region.

Your question isn't concerned with cvcell.
I recommend you to post this question to OpenCV mailing list
if you don't understand the way to use the function.

Sincerely,

-- 
Hiroki Sugano
E-mail: hi...@ea...
Department of Communications and Computer Engineering
Graduate School of Informatics, Kyoto University, Japan