無法檢測通過Iphone拍攝的圖像中的臉部

Question

我遇到問題。我使用2圖像。一個是從互聯網下載。另一個被iPhone的相機拍攝。 我使用CIDetector來檢測2張圖像中的人臉。它從互聯網上下載圖像完美。但另一方面，它無法檢測或發現錯誤。

我檢查了很多圖像。結果是一樣的。

Answer 1

試試這個

NSDictionary *options = [NSDictionary dictionaryWithObject: CIDetectorAccuracyLow   forKey: CIDetectorAccuracy]; 
     CIDetector *detector = [CIDetector detectorOfType: CIDetectorTypeFace context: nil options: options]; 

     CIImage *ciImage = [CIImage imageWithCGImage: [image CGImage]]; 
    NSNumber *orientation = [NSNumber numberWithInt:[image imageOrientation]+1]; 
    NSDictionary *fOptions = [NSDictionary dictionaryWithObject:orientation forKey: CIDetectorImageOrientation]; 
     NSArray *features = [detector featuresInImage:ciImage options:fOptions]; 
     for (CIFaceFeature *f in features) { 

      NSLog(@"left eye found: %@", (f. hasLeftEyePosition ? @"YES" : @"NO")); 

      NSLog(@"right eye found: %@", (f. hasRightEyePosition ? @"YES" : @"NO")); 

      NSLog(@"mouth found: %@", (f. hasMouthPosition ? @"YES" : @"NO")); 

      if(f.hasLeftEyePosition) 

       NSLog(@"left eye position x = %f , y = %f", f.leftEyePosition.x, f.leftEyePosition.y); 

      if(f.hasRightEyePosition) 

       NSLog(@"right eye position x = %f , y = %f", f.rightEyePosition.x, f.rightEyePosition.y); 

      if(f.hasMouthPosition) 

       NSLog(@"mouth position x = %f , y = %f", f.mouthPosition.x, f.mouthPosition.y); 

     } 

如果您使用的是前置攝像頭總是在肖像添加此

 NSDictionary* imageOptions = [NSDictionary dictionaryWithObject:[NSNumber  numberWithInt:6] forKey:CIDetectorImageOrientation]; 
     NSArray* features = [detector featuresInImage:image options:imageOptions]; 

欲瞭解更多信息

樣本：https://github.com/beetlebugorg/PictureMe

iOS Face Detection Issue

Face Detection issue using CIDetector

https://stackoverflow.com/questions/4332868/detect-face-in-iphone?rq=1

Answer 2

我嘗試上面這段代碼。它可以檢測Iphone捕獲的圖像。但它無法檢測到互聯網上的圖像下載。這是我的代碼

NSDictionary *options = [NSDictionary dictionaryWithObject: CIDetectorAccuracyLow   forKey: CIDetectorAccuracy]; 
CIDetector *detector = [CIDetector detectorOfType: CIDetectorTypeFace context: nil options: options]; 

CIImage *ciImage = [CIImage imageWithCGImage: [facePicture CGImage]]; 
NSDictionary* imageOptions = [NSDictionary dictionaryWithObject:[NSNumber  numberWithInt:6] forKey:CIDetectorImageOrientation]; 
NSArray *features = [detector featuresInImage:ciImage options:imageOptions]; 

而當它檢測到臉。我通過展示代碼

for (CIFaceFeature *feature in features) { 

// //設置紅色特徵顏色

CGRect faceRect = [feature bounds]; 

    CGContextSetRGBFillColor(context, 0.0f, 0.0f, 0.0f, 0.5f); 
    CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor); 
    CGContextSetLineWidth(context, 2.0f * scale); 
    CGContextAddRect(context, feature.bounds); 
    CGContextDrawPath(context, kCGPathFillStroke); 
    CGContextDrawImage(context, faceRect, [imgDraw CGImage]); 

這不是正確的位置。它向右移動。

Answer 3

我有同樣的問題。您可以在檢測之前更改圖像的大小。

CGSize size = CGSizeMake(cameraCaptureImage.size.width, cameraCaptureImage.size.height); 
UIGraphicsBeginImageContext(size); 
[cameraCaptureImage drawInRect:CGRectMake(0, 0, size.width, size.height)]; 
cameraCaptureImage = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext();