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我遵循OpenCV 网站上的 iOS 视频处理教程，并设法在设备上编译和安装它。但是，当我单击“开始”按钮时，什么都没有发生。显然，我的- (void)processImage:(Mat&)image回调从未被调用过。你能给我一些提示可能是什么问题吗？

我检查了一些事情：

  • actionStart被调用，并且两个日志行都打印 YES
  • 该self对象在分配给时有效self.videoCamera.delegate
  • imageView有效且在屏幕上可见
  • videoCamera在调用其start方法时初始化

我使用 iPhone 3GS 进行测试。

这是我的 ViewController.h 的完整源代码：

#import <UIKit/UIKit.h>
#import <opencv2/highgui/cap_ios.h>

@interface ViewController : UIViewController <CvVideoCameraDelegate>
{
    IBOutlet UIImageView* imageView;
    IBOutlet UIButton* button;

    CvVideoCamera* videoCamera;
}

- (IBAction)actionStart:(id)sender;

@property (nonatomic, strong) CvVideoCamera* videoCamera;

@end

和 ViewController.mm：

@implementation ViewController

@synthesize videoCamera;

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.videoCamera = [[CvVideoCamera alloc] initWithParentView:imageView];
    self.videoCamera.delegate = self;

    self.videoCamera.defaultAVCaptureDevicePosition = AVCaptureDevicePositionFront;
    self.videoCamera.defaultAVCaptureSessionPreset = AVCaptureSessionPreset352x288;
    self.videoCamera.defaultAVCaptureVideoOrientation = AVCaptureVideoOrientationPortrait;
    self.videoCamera.defaultFPS = 30;
    self.videoCamera.grayscaleMode = NO;

}

#pragma mark - UI Actions

- (IBAction)actionStart:(id)sender;
{
    [self.videoCamera start];
    NSLog(@"video camera running: %d", [self.videoCamera running]);
    NSLog(@"capture session loaded: %d", [self.videoCamera captureSessionLoaded]);
}

#pragma mark - Protocol CvVideoCameraDelegate

- (void)processImage:(cv::Mat&)image
{
    // Do some OpenCV stuff with the image
    cv::Mat image_copy;
    cvtColor(image, image_copy, CV_BGRA2BGR);

    // invert image
    bitwise_not(image_copy, image_copy);
    cvtColor(image_copy, image, CV_BGR2BGRA);
}

@end
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1 回答 1

8

我在 iPhone 4 上测试过，效果很好。也许 iPhone 3GS 没有前置摄像头？然后你必须改变这一行self.videoCamera.defaultAVCaptureDevicePosition = AVCaptureDevicePositionFront：self.videoCamera.defaultAVCaptureDevicePosition = AVCaptureDevicePositionBack

于 2013-01-11T10:11:18.420 回答