Question

我想把一个灰度级的iplimage变成uiimage，反之亦然。我有两种方法，如下面的RGB色彩空间转换成功，但灰色图像没有成功。

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

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, kCGImageAlphaNone|kCGBitmapByteOrderDefault,
                                    provider, NULL, false, kCGRenderingIntentDefault);
UIImage *ret = [UIImage imageWithCGImage:imageRef];

CGImageRelease(imageRef);

CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpace);
return ret;

}

- (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);

IplImage *ret = cvCreateImage(cvGetSize(iplimage), IPL_DEPTH_8U, 3);
cvCvtColor(iplimage, ret, CV_RGBA2BGR);
cvReleaseImage(&iplimage);

return ret;

}

此时我需要帮助来解决我遇到的问题。

提前致谢..

Answer 1

在传递参数之前转换颜色通道怎么样？

    IplImage *image = cvCreateImage(cvGetSize(imgGray), IPL_DEPTH_32F, 3);
    cvCvtColor(imgGray, image, CV_GRAY2BGR);
    imageView.image = [self UIImageFromIplImage:image];

灰色UIImage - 灰色IPlimage转换

1 个答案: