这是苹果的代码(来自技术问答QA1702),用于从视频缓冲区获取UIImage。不幸的是,返回的图像被旋转了90度。我如何编辑它,以使返回的图像方向正确?
- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer
{
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
CVPixelBufferLockBaseAddress(imageBuffer, 0);
void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8,
bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
CGImageRef quartzImage = CGBitmapContextCreateImage(context);
CVPixelBufferUnlockBaseAddress(imageBuffer,0);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
UIImage *image = [UIImage imageWithCGImage:quartzImage];
CGImageRelease(quartzImage);
return (image);
}
发布于 2010-12-05 04:54:30
取决于您使用的是前置摄像头还是后置摄像头
int frontCameraImageOrientation = UIImageOrientationLeftMirrored;
int backCameraImageOrientation = UIImageOrientationRight;
UIImage *image = [[UIImage alloc] initWithCGImage:newImage scale:(CGFloat)1.0 orientation:frontCameraImageOrientation];
发布于 2015-04-03 02:45:37
您可以更改videoOrientation,这样您就可以获得正确的图像
connection.videoOrientation = AVCaptureVideoOrientationPortrait
因为默认情况下视频方向不是纵向的。
发布于 2015-04-15 16:35:49
只需旋转上下文
只需以弧度旋转上下文即可。这个调用会将上下文旋转90度。
CGFloat degrees = 90.f;
CGFloat radians = degrees * (M_PI / 180.f);
CGContextRotateCTM(context, radians);
您可以轻松地将此方法设置为采用所需的方向并相应地旋转。
https://stackoverflow.com/questions/4355070
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