Ios 如何通过iPhone摄像头进行实时人脸检测&xFF1F；

这是Swift语言版本。（源地址：）

这是我的密码。有人能帮我找到它不起作用的原因吗

#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

#导入“ViewController.h”
#进口
@界面视图控制器（）{
AVCaptureSession*captureSession；
AVCaptureDevice*captureDevice；
AVCaptureVideoPreviewLayer*预览层；
UIImage*结果图像；
布尔伊斯塔特；
}
@结束
@实现视图控制器
-（无效）viewDidLoad{
[超级视图下载]；
isStart=否；
[自我肯定]；
captureSession=[[AVCaptureSession alloc]init]；
captureDevice=[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]；
captureSession.sessionPreset=AVCaptureSessionPresetLow；
NSArray*设备=[[NSArray alloc]init]；
设备=[AvCaptureDevices]；
用于（AVCaptureDevice*设备中的设备）{
if（[设备hasMediaType:AVMediaTypeVideo]）{
if（device.position==AVCaptureDevicePositionFront）{
captureDevice=设备；
如果（captureDevice！=无）{
NSLog（@“找到捕获设备”）；
[自我开始]；
}
}
}
}
//加载视图后，通常从nib执行任何其他设置。
}
-（无效）是真的{
isStart=是；
}
-（无效）开始{
AVCaptureDeviceInput*captureDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:captureDevice错误：nil]；
[captureSession addInput:captureDeviceInput]；
AVCaptureVideoDataOutput*输出=[[AVCaptureVideoDataOutput alloc]init]；
调度队列摄像机队列；
cameraQueue=调度队列创建（“cameraQueue”，调度队列\u序列）；
[output setSampleBufferDelegate:自队列：cameraQueue]；
NSDictionary*videoSettings=[[NSDictionary alloc]initWithObjectsAndKeys:[NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA]，kCVPixelBufferPixelFormatTypeKey，无]；
output.videoSettings=视频设置；
[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）SampleBufferfromConnection:（AVCaptureConnection*）连接{
如果（isStart）{
结果年龄=[[UIImage alloc]init]；
结果年龄=[self-sampleBufferToImage:sampleBuffer]；
CIContext*上下文=[CIContext contextWithOptions:[NSDictionary Dictionary WithObject:[NSNumber numberWithBool:YES]forKey:KCIContexturesSoftwareRenderer]；
CIDetector*检测器=[CIDetector检测器类型：CIDetectorTypeFace上下文：上下文选项：[NSDictionary Dictionary Dictionary WithObject:CIDetectorAccuracyHigh-forKey:CIDetectorAccuracy]]；
CIImage*CIImage=[[CIImage alloc]init]；
ciImage=[ciImage-imageWithCGImage:resultImage.CGImage]；
dispatch\u async（dispatch\u get\u main\u queue（）^{
previewIV.image=resultImage；
});
NSArray*结果=[detector featuresInImage:ciImage选项：[NSDictionary Dictionary Dictionary WithObject:[NSNumber numberWithInt:6]forKey:CIDetectorImageOrientation]；
用于（CIFaceFeature*结果中的面）{
UIImage*faceImage=[UIImage imageWithCGImage:[context CreateCImage:ciImage fromRect:face.bounds]比例：1.0方向：UIImageOrientationRight]；
NSLog（@“===%@”，NSStringFromCGRect（face.bounds））；
}
}
}
-（UIImage*）sampleBufferToImage：（CMSampleBufferRef）sampleBuffer{
CVImageBufferRef imageBuffer=CMSampleBufferGetImageBuffer（sampleBuffer）；
void*baseAddress=CVPixelBufferGetBaseAddressOfPlane（imageBuffer，0）；
size_t bytesPerRow=CVPixelBufferGetBytesPerRow（图像缓冲区）；
size\u t width=CVPixelBufferGetWidth（imageBuffer）；
大小\u t高度=CVPixelBufferGetHeight（imageBuffer）；
CGColorSpaceRef colorSpace=CGColorSpaceCreateDeviceRGB（）；
int BitsPerComponent=8；
CGContextRef context=CGBitmapContextCreate（基址、宽度、高度、比特组成、字节数、颜色空间，（kCGBitmapByteOrder32Little | KCGimageAlphaPremultipledFirst））；
CGImageRef imageRef=CGBitmapContextCreateImage（上下文）；
UIImage*结果=[[UIImage alloc]initWithCGImage:imageRef比例：1.0方向：UIImageOrientionRight]；
返回结果；
}
-（无效）未收到记忆警告{
[超级记忆警告]；
[捕获会话停止运行]；
//处置所有可以重新创建的资源。
}
@结束

这是该检测viewcontroller的全部代码

---

您可以复制此文件并导入AVdoundation.framework和coremedia.framework。

如果查看预览，您会发现它是一个空图像

所以我把你的sampleBufferToImage方法改为blow，它就可以工作了

-(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;
}

---

它以什么方式不起作用？它会崩溃吗？你会出错吗？正如拉塞尔先生所说，你需要比仅仅要求人们让你的代码“正常工作”更具体一点。我附加了一些更详细的情况信息。它没有崩溃，也没有出现任何错误。它只是没有正确地检测到我的脸，然后帮我记录信息。谢谢你的回答。如你所说，在编辑我的代码后，它可以捕捉相机图像。我已经接受了你的回答。再次感谢你！