4

iplimage と uiimage の間で変換するコードを使用しています。カメラ (UIImage) から撮影した写真を撮り、それを iplimage に変換して、以下に投稿されたコードを使用して元に戻します。残念ながら、これにより画像が 90 度回転および引き伸ばされます。したがって、320x480 の画像を取得すると、320x480 の画像が返されますが、画像は回転および再スケーリングされているため、90 度回転したように見えます (つまり、480x320 の画像)。 out -- すべてが正しいようです (バイト順など)

+(IplImage *)CreateIplImageFromUIImage:(UIImage *)image {
CGImageRef imageRef = image.CGImage;

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
IplImage *iplimage = cvCreateImage(cvSize(image.size.width, image.size.height), IPL_DEPTH_8U, 4);
CGContextRef contextRef = CGBitmapContextCreate(iplimage->imageData, iplimage->width, iplimage->height,
                                                iplimage->depth, iplimage->widthStep,
                                                colorSpace, kCGImageAlphaPremultipliedLast|kCGBitmapByteOrderDefault);
CGContextDrawImage(contextRef, CGRectMake(0, 0, image.size.width, image.size.height), imageRef);
CGContextRelease(contextRef);
CGColorSpaceRelease(colorSpace);

return iplimage;
}

+(UIImage *)UIImageFromIplImage:(IplImage *)image {
NSLog(@"IplImage (%d, %d) %d bits by %d channels, %d bytes/row %s", image->width, image->height, image->depth, image->nChannels, image->widthStep, image->channelSeq);

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
NSData *data = [NSData dataWithBytes:image->imageData length:image->imageSize];
CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)data);
CGImageRef imageRef = CGImageCreate(image->width, image->height,
                                    image->depth, image->depth * image->nChannels, image->widthStep,
                                    colorSpace, kCGImageAlphaPremultipliedLast|kCGBitmapByteOrderDefault,
                                    provider, NULL, false, kCGRenderingIntentDefault);
UIImage *ret = [UIImage imageWithCGImage:imageRef scale:1.0 orientation:UIImageOrientationRight];
CGImageRelease(imageRef);
CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpace);
return ret;
}
4

3 に答える 3

4

私も同じ問題を抱えていましたが、2つの方法を変更して画像を回転させないようにする方法がまだわかりませんでした。

代わりに、UIImage を回転させました。たとえば、私のコードは次のようになります。

//Change the rotation here

UIImage *imageCam= [UIImage imageWithCGImage:newImage scale:1.0 orientation:UIImageOrientationUp];

//Convert UIImage
IplImage *image = [self CreateIplImageFromUIImage:imageCam];
于 2011-01-18T11:44:46.143 に答える
4

変えるだけ

UIImage *ret = [UIImage imageWithCGImage:imageRef scale:1.0 orientation:UIImageOrientationRight];

の中へ：

UIImage *ret = [UIImage imageWithCGImage:imageRef scale:1.0 orientation:UIImageOrientationUp];
于 2011-05-25T12:51:51.037 に答える
1

私は同じ問題を抱えていましたが、解決策を見つけました-次のCreateIplImageFromUIImageように変更します:

- (IplImage *)CreateIplImageFromUIImage:(UIImage *)image {

    CGImageRef imageRef = [self rotateImage:image].CGImage;
        ...........
}

- (UIImage* )rotateImage:(UIImage *)image { 
    int kMaxResolution = 320; 
    // Or whatever     
    CGImageRef imgRef = image.CGImage;
    CGFloat width = CGImageGetWidth(imgRef);
    CGFloat height = CGImageGetHeight(imgRef);
    CGAffineTransform transform = CGAffineTransformIdentity;
    CGRect bounds = CGRectMake(0, 0, width, height);     
    if (width > kMaxResolution || height > kMaxResolution) {         
        CGFloat ratio = width  /  height;
        if (ratio > 1 ) {  
            bounds.size.width = kMaxResolution;
            bounds.size.height = bounds.size.width / ratio;
        }
        else {
            bounds.size.height = kMaxResolution;
            bounds.size.width = bounds.size.height * ratio;
        }
    }       
    CGFloat scaleRatio = bounds.size.width / width;
    CGSize imageSize = CGSizeMake(CGImageGetWidth(imgRef), CGImageGetHeight(imgRef));
    CGFloat boundHeight;
    UIImageOrientation orient = image.imageOrientation;
    switch (orient) { 
        case UIImageOrientationUp:
            //EXIF = 1
            transform = CGAffineTransformIdentity;
            break;           
        case UIImageOrientationUpMirrored:
            //EXIF = 2
            transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);
            transform = CGAffineTransformScale(transform, -1.0, 1.0 );
            break;           
        case UIImageOrientationDown: 
            //EXIF = 3
            transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height); 
            transform = CGAffineTransformRotate(transform, M_PI);
            break; 
        case UIImageOrientationDownMirrored:
            //EXIF = 4 
            transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);
            transform = CGAffineTransformScale(transform, 1.0, -1.0);
            break;
        case UIImageOrientationLeftMirrored:
            //EXIF = 5
            boundHeight = bounds.size.height;
            bounds.size.height = bounds.size.width;
            bounds.size.width = boundHeight;
            transform = CGAffineTransformMakeTranslation(imageSize.height, imageSize.width ); 
            transform = CGAffineTransformScale(transform, -1.0, 1.0);    
            transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0 );
            break;           
        case UIImageOrientationLeft: 
            //EXIF = 6
            boundHeight = bounds.size.height;
            bounds.size.height = bounds.size.width;
            bounds.size.width = boundHeight;
            transform = CGAffineTransformMakeTranslation(0.0, imageSize.width);
            transform = CGAffineTransformRotate( transform, 3.0 * M_PI / 2.0   );
            break;           
        case UIImageOrientationRightMirrored: 
            //EXIF = 7
            boundHeight = bounds.size.height;
            bounds.size.height = bounds.size.width; 
            bounds.size.width = boundHeight;
            transform = CGAffineTransformMakeScale(-1.0, 1.0);
            transform = CGAffineTransformRotate( transform, M_PI / 2.0);
            break;           
        case UIImageOrientationRight: 
            //EXIF = 8   
            boundHeight = bounds.size.height;
            bounds.size.height = bounds.size.width;
            bounds.size.width = boundHeight;
            transform = CGAffineTransformMakeTranslation(imageSize.height, 0.0);
            transform = CGAffineTransformRotate(transform, M_PI / 2.0 );
            break;
        default:
        [NSException raise:NSInternalInconsistencyException format:@"Invalid image orientation"];
    }       
    UIGraphicsBeginImageContext(bounds.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    if (orient == UIImageOrientationRight || orient == UIImageOrientationLeft) {
        CGContextScaleCTM(context, -scaleRatio, scaleRatio);
        CGContextTranslateCTM(context, -height, 0);
    }     
    else {
        CGContextScaleCTM(context, scaleRatio, -scaleRatio);
        CGContextTranslateCTM(context, 0, -height);
    } 
    CGContextConcatCTM(context, transform );
    CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, width, height), imgRef);
    UIImage *imageCopy = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return imageCopy;
}
于 2012-05-19T08:35:41.467 に答える