Iphone AVCaptureStillImageOutput中的UIImage方向不正确
我试图从AVCaptureStillImageOutput中捕获像素数据,并注意到在将图像裁剪为CGImage时,它会重新定向。为了测试这一点,我向照片库输出了一个临时图像。现在我注意到,即使在图像被裁剪之前,它的缩略图也会旋转,而完整图像则不会。(当我将UIImage传递给需要适当尺寸的自定义pixelDataManager时,这会成为一个问题。) 设置Iphone AVCaptureStillImageOutput中的UIImage方向不正确,iphone,ios,uiimage,avcapturesession,avcapturedevice,Iphone,Ios,Uiimage,Avcapturesession,Avcapturedevice,我试图从AVCaptureStillImageOutput中捕获像素数据,并注意到在将图像裁剪为CGImage时,它会重新定向。为了测试这一点,我向照片库输出了一个临时图像。现在我注意到,即使在图像被裁剪之前,它的缩略图也会旋转,而完整图像则不会。(当我将UIImage传递给需要适当尺寸的自定义pixelDataManager时,这会成为一个问题。) 设置captureVideoPreviewLayer.orientation=AVCaptureVideoOrientation纵向和[视频连接设
captureVideoPreviewLayer.orientation=AVCaptureVideoOrientation纵向
和[视频连接设置视频方向:AVCaptureVideoOrientation纵向]代码>似乎没有改变任何东西
有什么想法吗???
我会把它分成几个部分
1)设置会话、输入和输出:
// Create a capture session
AVCaptureSession *session = [[AVCaptureSession alloc] init];
session.sessionPreset = AVCaptureSessionPresetMedium;
AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
// Add capture layer to visible view
captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResize;
captureVideoPreviewLayer.frame = screenBounds;
captureVideoPreviewLayer.bounds = screenBounds;
captureVideoPreviewLayer.orientation = AVCaptureVideoOrientationPortrait;
[self.vImagePreview.layer addSublayer:captureVideoPreviewLayer];
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
// Setup error handling
NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
if (!input) {
// Handle the error appropriately.
NSLog(@"ERROR: trying to open camera: %@", error);
}
[session addInput:input];
// Start session
[session startRunning];
// Output image data
stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys: AVVideoCodecJPEG, AVVideoCodecKey, nil];
[stillImageOutput setOutputSettings:outputSettings];
[session addOutput:stillImageOutput];
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in stillImageOutput.connections)
{
for (AVCaptureInputPort *port in [connection inputPorts])
{
if ([[port mediaType] isEqual:AVMediaTypeVideo] )
{
videoConnection = connection;
break;
}
}
if (videoConnection) { break; }
}
if ([videoConnection isVideoOrientationSupported])
{
[videoConnection setVideoOrientation:AVCaptureVideoOrientationPortrait];
}
NSLog(@"about to request a capture from: %@", stillImageOutput);
[stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error)
{
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
UIImage *image = [[UIImage alloc] initWithData:imageData];
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
//......
}
2)设置视频连接:
// Create a capture session
AVCaptureSession *session = [[AVCaptureSession alloc] init];
session.sessionPreset = AVCaptureSessionPresetMedium;
AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
// Add capture layer to visible view
captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResize;
captureVideoPreviewLayer.frame = screenBounds;
captureVideoPreviewLayer.bounds = screenBounds;
captureVideoPreviewLayer.orientation = AVCaptureVideoOrientationPortrait;
[self.vImagePreview.layer addSublayer:captureVideoPreviewLayer];
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
// Setup error handling
NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
if (!input) {
// Handle the error appropriately.
NSLog(@"ERROR: trying to open camera: %@", error);
}
[session addInput:input];
// Start session
[session startRunning];
// Output image data
stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys: AVVideoCodecJPEG, AVVideoCodecKey, nil];
[stillImageOutput setOutputSettings:outputSettings];
[session addOutput:stillImageOutput];
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in stillImageOutput.connections)
{
for (AVCaptureInputPort *port in [connection inputPorts])
{
if ([[port mediaType] isEqual:AVMediaTypeVideo] )
{
videoConnection = connection;
break;
}
}
if (videoConnection) { break; }
}
if ([videoConnection isVideoOrientationSupported])
{
[videoConnection setVideoOrientation:AVCaptureVideoOrientationPortrait];
}
NSLog(@"about to request a capture from: %@", stillImageOutput);
[stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error)
{
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
UIImage *image = [[UIImage alloc] initWithData:imageData];
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
//......
}
3)输出捕获的图像:
// Create a capture session
AVCaptureSession *session = [[AVCaptureSession alloc] init];
session.sessionPreset = AVCaptureSessionPresetMedium;
AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
// Add capture layer to visible view
captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResize;
captureVideoPreviewLayer.frame = screenBounds;
captureVideoPreviewLayer.bounds = screenBounds;
captureVideoPreviewLayer.orientation = AVCaptureVideoOrientationPortrait;
[self.vImagePreview.layer addSublayer:captureVideoPreviewLayer];
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
// Setup error handling
NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
if (!input) {
// Handle the error appropriately.
NSLog(@"ERROR: trying to open camera: %@", error);
}
[session addInput:input];
// Start session
[session startRunning];
// Output image data
stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys: AVVideoCodecJPEG, AVVideoCodecKey, nil];
[stillImageOutput setOutputSettings:outputSettings];
[session addOutput:stillImageOutput];
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in stillImageOutput.connections)
{
for (AVCaptureInputPort *port in [connection inputPorts])
{
if ([[port mediaType] isEqual:AVMediaTypeVideo] )
{
videoConnection = connection;
break;
}
}
if (videoConnection) { break; }
}
if ([videoConnection isVideoOrientationSupported])
{
[videoConnection setVideoOrientation:AVCaptureVideoOrientationPortrait];
}
NSLog(@"about to request a capture from: %@", stillImageOutput);
[stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error)
{
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
UIImage *image = [[UIImage alloc] initWithData:imageData];
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
//......
}
当您这样做时,虽然图像是作为UIImage提供给您的,但实际上它使用的是底层的Quartz CGImage数据,它有一个不同的原点(我认为是左下角),这意味着当您使用图像时,它会旋转到一边
我发现了一个C函数,您可以使用UIImage作为参数来调用它,该函数可以修复它并返回修复的UIImage
我会尝试查看[image imageOrientation],看看它的方向。如果设置错误,可以先旋转图像,然后将其写入相册。希望有帮助!谢谢,我今晚会看一看。实际上我甚至不需要相册输出。我只是做了一个快速检查,以解释为什么我的像素数据的行为就像图像被旋转一样,而且确实如此。即使您将视频会话设置为一个方向,您仍然需要决定显示/保存图像时的方向。在这里查看我的答案,了解类似的问题: