Question

这是Swift语言版本。（来源地址：Swift Version.）

这是我的密码。任何人都可以帮我找到它没有用的原因吗？

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface ViewController ()<AVCaptureVideoDataOutputSampleBufferDelegate>{
AVCaptureSession *captureSession;
AVCaptureDevice *captureDevice;
AVCaptureVideoPreviewLayer *previewLayer;
UIImage *resultImage;
BOOL isStart;


}

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
isStart = NO;
[self isStartTrue];
captureSession = [[AVCaptureSession alloc]init];
captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

captureSession.sessionPreset = AVCaptureSessionPresetLow;
NSArray *devices = [[NSArray alloc]init];
devices = [AVCaptureDevice devices];
for (AVCaptureDevice *device in devices) {
    if ([device hasMediaType:AVMediaTypeVideo]) {
        if (device.position == AVCaptureDevicePositionFront) {
            captureDevice = device;
            if (captureDevice != nil) {
                NSLog(@"Capture Device found");
                [self beginSession];
            }
        }
    }
}
// Do any additional setup after loading the view, typically from a nib.
}


-(void) isStartTrue {
isStart = YES;
}

-(void)beginSession {
AVCaptureDeviceInput *captureDeviceInput = [[AVCaptureDeviceInput alloc]initWithDevice:captureDevice error:nil];
[captureSession addInput:captureDeviceInput];
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc]init];
dispatch_queue_t cameraQueue;
cameraQueue = dispatch_queue_create("cameraQueue", DISPATCH_QUEUE_SERIAL);
[output setSampleBufferDelegate:self queue:cameraQueue];
NSDictionary *videoSettings = [[NSDictionary alloc] initWithObjectsAndKeys:[NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA],kCVPixelBufferPixelFormatTypeKey, nil];
output.videoSettings = videoSettings;
[captureSession addOutput:output];
previewLayer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:captureSession];
previewLayer.videoGravity = @"AVLayerVideoGravityResizeAspect";
previewLayer.frame = self.view.bounds;
[self.view.layer addSublayer:previewLayer];
[captureSession startRunning];

}


-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection{

if (isStart) {

    resultImage = [[UIImage alloc] init];
    resultImage = [self sampleBufferToImage:sampleBuffer];

    CIContext *context = [CIContext contextWithOptions:[NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:kCIContextUseSoftwareRenderer]];
    CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeFace context:context options:[NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh forKey:CIDetectorAccuracy]];
    CIImage *ciImage = [[CIImage alloc]init];
    ciImage = [CIImage imageWithCGImage:resultImage.CGImage];
    dispatch_async(dispatch_get_main_queue(), ^{
        previewIV.image = resultImage;
    });
    NSArray *results = [detector featuresInImage:ciImage options:[NSDictionary dictionaryWithObject:[NSNumber numberWithInt:6] forKey:CIDetectorImageOrientation]];
    for (CIFaceFeature *face in results) {
        UIImage *faceImage = [UIImage imageWithCGImage:[context createCGImage:ciImage fromRect:face.bounds] scale:1.0 orientation:UIImageOrientationRight];
        NSLog(@"     ====%@", NSStringFromCGRect(face.bounds));


    }

}
}


-(UIImage *)sampleBufferToImage:(CMSampleBufferRef)sampleBuffer{

CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);

void * baseAddress = CVPixelBufferGetBaseAddressOfPlane(imageBuffer, 0);
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
int bitsPerCompornent = 8;
CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, bitsPerCompornent, bytesPerRow, colorSpace, (kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst));
CGImageRef imageRef = CGBitmapContextCreateImage(context);
UIImage *result = [[UIImage alloc]initWithCGImage:imageRef scale:1.0 orientation:UIImageOrientationRight];
return result;

}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
[captureSession stopRunning];
// Dispose of any resources that can be recreated.
}

@end

这是此检测视图控制器的完整代码。

您可以复制它并导入AVdoundation.framework和coremedia.framework。

Answer 1

如果你看一下你的预览IV，你会发现它是一张空图像。

所以我将你的sampleBufferToImage方法更改为打击，它可以正常工作。

-(UIImage *)sampleBufferToImage:(CMSampleBufferRef)sampleBuffer{

    CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
    CIImage *ciImage = [CIImage imageWithCVPixelBuffer:imageBuffer];
    CIContext *temporaryContext = [CIContext contextWithOptions:nil];
    CGImageRef videoImage = [temporaryContext
                             createCGImage:ciImage
                             fromRect:CGRectMake(0, 0,
                                                 CVPixelBufferGetWidth(imageBuffer),
                                                 CVPixelBufferGetHeight(imageBuffer))];
    UIImage *result = [[UIImage alloc] initWithCGImage:videoImage];
    CGImageRelease(videoImage);
    return result;
}

如何通过iPhone相机进行实时人脸检测？

1 个答案: