OpenCv iOSカメラプレビューストレッチなしの単方向のみ

Question

iOS用のOpenCv Cordovaプラグインを作成しています。私はカメラのプレビューがフルスクリーンで、すべてのiOSデバイス（iPhone、iPad）のアスペクト比を維持する必要がありました。

私はポートレートモードを達成することができました（コードを参照）、それはiPhone 6に完璧に動作します/プラスが、カメラのプレビューは、おそらくAVCaptureSessionPresetHighのサポート解像度が1280×720であるという事実にiPadの上で少し伸ばしています。誰でも単一の方向（縦または横のみ）を達成し、縦横比を維持する方法に関するアイデアはありますか？カメラを起動するための

私の現在のコードは、私がFixedCvVideoCameraの代わりに、OpenCVのCvVideoCameraクラスを使用してい

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view. 

    // Initialize imageView to fullscreen 
    imageView = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].bounds]; 
    [self.view addSubview:imageView]; 
    [imageView setContentMode:UIViewContentModeScaleAspectFill]; 
    [imageView setClipsToBounds:YES]; 

    self.videoCamera = [[FixedCvVideoCamera alloc] initWithParentView:imageView]; 
    self.videoCamera.delegate = self; 
    self.videoCamera.defaultAVCaptureDevicePosition = AVCaptureDevicePositionBack; 
    self.videoCamera.defaultAVCaptureSessionPreset = AVCaptureSessionPresetHigh; 
    self.videoCamera.defaultAVCaptureVideoOrientation = AVCaptureVideoOrientationPortrait; 
    self.videoCamera.defaultFPS = 30; 
    [self.videoCamera start]; 
} 

お知らせです。その理由は、CvVideoCameraのlayoutPreviewLayerのポートレートモードを維持する機能をサブクラス化してオーバーライドするためです。

- (void)layoutPreviewLayer; 
{ 
    if (self.parentView != nil) 
    { 
     CALayer* layer = self->customPreviewLayer; 
     CGRect bounds = self->customPreviewLayer.bounds; 
     int rotation_angle = 0; 

     switch (defaultAVCaptureVideoOrientation) { 
      case AVCaptureVideoOrientationLandscapeRight: 
       rotation_angle = 270; 
       break; 
      case AVCaptureVideoOrientationPortraitUpsideDown: 
       rotation_angle = 180; 
       break; 
      case AVCaptureVideoOrientationLandscapeLeft: 
       rotation_angle = 90; 
       break; 
      case AVCaptureVideoOrientationPortrait: 
      default: 
       break; 
     } 

     layer.position = CGPointMake(self.parentView.frame.size.width/2., self.parentView.frame.size.height/2.); 
     layer.affineTransform = CGAffineTransformMakeRotation(DEGREES_RADIANS(rotation_angle)); 
     layer.bounds = bounds; 
    } 
} 

ありがとうございます。

Answer 1

私はそれを自分で解決しました。このコードは、ポートレートモードのみを固定し、前面と背面のカメラをサポートしたい人に役立ちます。

のViewController

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view. 

    // Initialize imageView to fullscreen 
    imageView = [[UIImageView alloc] initWithFrame:[UIScreen mainScreen].bounds]; 
    [self.view addSubview:imageView]; 
    [imageView setContentMode:UIViewContentModeScaleAspectFill]; 
    [imageView setClipsToBounds:YES]; 

    self.videoCamera = [[FixedCvVideoCamera alloc] initWithParentView:imageView]; 
    self.videoCamera.delegate = self; 
    self.videoCamera.defaultAVCaptureDevicePosition = AVCaptureDevicePositionBack; 
    self.videoCamera.defaultAVCaptureSessionPreset = AVCaptureSessionPresetHigh; 
    self.videoCamera.defaultAVCaptureVideoOrientation = AVCaptureVideoOrientationPortrait; 
    self.videoCamera.defaultFPS = 30; 
    self.videoCamera.grayscaleMode = NO; 

    [self.videoCamera start]; 
} 

FixedCvVideoCamera：CvVideoCamera

- (void)layoutPreviewLayer; 
{ 
    if (self.parentView != nil) 
    { 
     CALayer* layer = self->customPreviewLayer; 
     CGRect bounds = self->customPreviewLayer.bounds; 
     NSLog(@"[FixedCvVideoCamera]Custom Preview Layer bounds %fx%f", bounds.size.width, bounds.size.height); 

     float previewAspectRatio = bounds.size.height/bounds.size.width; 
     NSLog(@"[FixedCvVideoCamera]Preview aspect ratio %f", previewAspectRatio); 

     //int rotation_angle = 0; 

     layer.position = CGPointMake(self.parentView.frame.size.width/2., self.parentView.frame.size.height/2.); 
     //layer.affineTransform = CGAffineTransformMakeRotation(DEGREES_RADIANS(rotation_angle)); 

     // Get video feed's resolutions 
     NSArray* devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]; 
     AVCaptureDevice* device = nil; 
     for (AVCaptureDevice *d in devices) { 
      // Get the default camera device - should be either front of back camera device 
      if ([d position] == self.defaultAVCaptureDevicePosition) { 
       device = d; 
      } 
     } 

     // Set the default device if not found 
     if (!device) { 
      device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; 
     } 

     CMVideoDimensions dimensions = CMVideoFormatDescriptionGetDimensions(device.activeFormat.formatDescription); 
     CGSize resolution = CGSizeMake(dimensions.width, dimensions.height); 
     if (self.defaultAVCaptureVideoOrientation == AVCaptureVideoOrientationPortrait || self.defaultAVCaptureVideoOrientation == AVCaptureVideoOrientationPortraitUpsideDown) { 
      resolution = CGSizeMake(resolution.height, resolution.width); 
     } 
     NSLog(@"[FixedCvVideoCamera]Video feed resolution is %fx%f", resolution.width, resolution.height); 

     float videoFeedAspectRatio = resolution.height/resolution.width; 
     NSLog(@"[FixedCvVideoCamera]Video feed's aspect ratio is %f", videoFeedAspectRatio); 

     // Set layer bounds to ASPECT FILL by expanding either the width or the height 
     if (previewAspectRatio > videoFeedAspectRatio) { 
      NSLog(@"[FixedCvVideoCamera] Preview is more rectangular than the video feed aspect ratio. Expanding width to maintain aspect ratio."); 
      float newWidth = bounds.size.height/videoFeedAspectRatio; 
      layer.bounds = CGRectMake(0, 0, newWidth, bounds.size.height); 
     } else { 
      NSLog(@"[FixedCvVideoCamera] Preview is equally or less rectangular (wider) than the video feed's aspect ratio. Expanding height bound to maintain aspect ratio."); 
      float newHeight = bounds.size.width * videoFeedAspectRatio; 
      layer.bounds = CGRectMake(0, 0, bounds.size.width, newHeight); 
     } 
    } 
}