[PD-dev] opencv rgba/gray output os X vs Ubuntu

Hi again,

I compiled the same code on Ubuntu Hardy 32 bits, and everything is ok , so apparently it is a problem related to os X. (with the same file and patche).

does anybody know how to avoid this ?

thanks, loic

Hi,

I try to develop some code in opencv in the pix_opencv's style. To start, I tried to convert rgba to gray using opencv ( cvCvtColor(orig, gray, CV_BGRA2GRAY); )

but I can't get a gray picture of the same size at the output. If I just copy the gray image, I get just 4 small gray copy of the original on one line on the top of the image.

If I try to convert from grey to rgba before to output the data, I get a monochrome but yellow picture.

I wonder if there's a relation with the fact that I am working on a mac, is it possible ? because of a difference coding of rgba on mac and others?

do someone know how I can solve this?

here is the code of the one which give me a yellow monochromatic picture:

///////////////// processImage ///////////////////////// void pix_opencv_mytest :: processRGBAImage(imageStruct &image) { if ((this->comp_xsize!=image.xsize)||(this->comp_ysize! =image.ysize)||(!orig)) { this->comp_xsize = image.xsize; this->comp_ysize = image.ysize;

cvReleaseImage(&orig); cvReleaseImage(&gray); cvReleaseImage(&bob);

//create the orig image with new size orig = cvCreateImage(cvSize(image.xsize,image.ysize), IPL_DEPTH_8U, 4); gray = cvCreateImage(cvSize(orig->width,orig->height), IPL_DEPTH_8U, 1); } // Here we make a copy of the pixel data from image to orig-

imageData, orig is a IplImage struct

memcpy( orig->imageData, image.data, image.xsize*image.ysize*4 ); cvCvtColor(orig, gray, CV_BGRA2GRAY); // Convert to grayscale cvCvtColor(gray, orig, CV_GRAY2BGRA); //copy back the processed frame to image memcpy( image.data, orig->imageData, image.xsize*image.ysize*4 );

}

thanks, loic