OpenCV iOS - Not the same result on simulator and on iPhone - iphone

Question

I have a problem with cropping image using OpenCV library on a real iPhone.
I have an image with selected area and I'd like to apply a perspective transform on the image with this area. This works fine on the simulator but on the iphone the new image isn't map to rectangle and the new image has also blue color.
Here is my code :
+ (IplImage *)CreateIplImageFromUIImage:(UIImage *)image {
// Getting CGImage from UIImage
CGImageRef imageRef = image.CGImage;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
// Creating temporal IplImage for drawing
IplImage *iplimage = cvCreateImage(
cvSize(image.size.width,image.size.height), IPL_DEPTH_8U, 4
);
// Creating CGContext for temporal IplImage
CGContextRef contextRef = CGBitmapContextCreate(
iplimage->imageData, iplimage->width, iplimage->height,
iplimage->depth, iplimage->widthStep,
colorSpace, kCGImageAlphaPremultipliedLast|kCGBitmapByteOrderDefault
);
// Drawing CGImage to CGContext
CGContextDrawImage(
contextRef,
CGRectMake(0, 0, image.size.width, image.size.height),
imageRef
);
CGContextRelease(contextRef);
CGColorSpaceRelease(colorSpace);
// Creating result IplImage
IplImage *ret = cvCreateImage(cvGetSize(iplimage), IPL_DEPTH_8U, 3);
cvCvtColor(iplimage, ret, CV_RGBA2BGR);
cvReleaseImage(&iplimage);
return ret;
}
+ (UIImage *)UIImageFromIplImage:(IplImage *)img {
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
// Creating result IplImage
IplImage *image = cvCreateImage(cvGetSize(img), IPL_DEPTH_8U, 4);
cvCvtColor(img, image, CV_BGR2RGBA);
// Allocating the buffer for CGImage
NSData *data =
[NSData dataWithBytes:image->imageData length:image->imageSize];
CGDataProviderRef provider =
CGDataProviderCreateWithCFData((CFDataRef)data);
// Creating CGImage from chunk of IplImage
CGImageRef imageRef = CGImageCreate(
image->width, image->height,
image->depth, image->depth * image->nChannels, image->widthStep,
colorSpace, kCGImageAlphaNone|kCGBitmapByteOrderDefault,
provider, NULL, false, kCGRenderingIntentDefault
);
// Getting UIImage from CGImage
UIImage *ret = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpace);
return ret;
}
+ (UIImage *)perspectiveTransform: (UIImage*) originalImage :(CGFloat) h :(CGFloat) w :(CGPoint) point1 :(CGPoint) point2 :(CGPoint) point3 :(CGPoint) point4
{
CvPoint2D32f srcQuad[4];
srcQuad[0].x = point1.x;
srcQuad[0].y = point1.y;
srcQuad[1].x = point2.x;
srcQuad[1].y = point2.y;
srcQuad[2].x = point3.x;
srcQuad[2].y = point3.y;
srcQuad[3].x = point4.x;
srcQuad[3].y = point4.y;
IplImage *src = [self CreateIplImageFromUIImage:originalImage];
IplImage *dst = cvCreateImage(cvGetSize(src),
src->depth,
src->nChannels);
cvZero(dst);
CGFloat width = src->width;
CGFloat height = src->height;
CvMat* mmat = cvCreateMat(3, 3, CV_32FC1);
CvPoint2D32f *c1 = (CvPoint2D32f *)malloc(4 * sizeof(CvPoint2D32f));
CvPoint2D32f *c2 = (CvPoint2D32f *)malloc(4 * sizeof(CvPoint2D32f));
c1[0].x = round((width/w)*srcQuad[0].x); c1[0].y = round((height/h)*srcQuad[0].y);
c1[1].x = round((width/w)*srcQuad[1].x); c1[1].y = round((height/h)*srcQuad[1].y);
c1[2].x = round((width/w)*srcQuad[2].x); c1[2].y = round((height/h)*srcQuad[2].y);
c1[3].x = round((width/w)*srcQuad[3].x); c1[3].y = round((height/h)*srcQuad[3].y);
c2[0].x = 0; c2[0].y = 0;
c2[1].x = width - 1; c2[1].y = 0;
c2[2].x = 0; c2[2].y = height - 1;
c2[3].x = width - 1; c2[3].y = height - 1;
mmat = cvGetPerspectiveTransform(c1, c2, mmat);
free(c1);
free(c2);
cvWarpPerspective(src, dst, mmat, CV_INTER_LINEAR+CV_WARP_FILL_OUTLIERS, cvScalarAll(0));
cvReleaseImage(&src);
cvReleaseMat(&mmat);
UIImage *newImage = [self UIImageFromIplImage:dst];
cvReleaseImage(&dst);
return newImage;
}
Thanks for your help !