Objective-C zu schnell Konvertierungsproblem auf CIHistogramDisplayFilter

Question

Ich habe dieses Code-Snippet, um ein Histogramm in Objective-C anzuzeigen, das einwandfrei funktioniert. Es fällt mir jedoch schwer, sie in Swift umzuwandeln.

Objective-C

//Show Histogram 
     CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); 
     CFDictionaryRef attachments = CMCopyDictionaryOfAttachments(kCFAllocatorDefault, sampleBuffer, kCMAttachmentMode_ShouldPropagate); 
     CIImage *ciImage = [[CIImage alloc] initWithCVPixelBuffer:pixelBuffer options:(__bridge NSDictionary *)attachments]; 


     NSUInteger count = 256; 
     count = count <= 256 ? count : 256; 
     count = count >= 1 ? count : 1; 


     NSDictionary *params = @{kCIInputImageKey: ciImage, 
           kCIInputExtentKey: [CIVector vectorWithCGRect:[ciImage extent]], 
           @"inputCount": @(256), @"inputScale": @(200) 
           }; 

     CIFilter *filter = [CIFilter filterWithName:@"CIAreaHistogram" 
           withInputParameters:params]; 


     CIImage *outImage = [filter outputImage]; 
    //--------------------------------------------- 

     CIContext *context = [CIContext contextWithOptions:nil]; 

     NSDictionary *params2 = @{ 
            kCIInputImageKey: outImage 
            }; 
     CIFilter *filter2 = [CIFilter filterWithName:@"CIHistogramDisplayFilter" 
           withInputParameters:params2]; 

     CIImage *outputImage = [filter2 outputImage]; 
     CGRect outExtent = [outputImage extent]; 
     CGImageRef cgImage = [context createCGImage:outputImage 
              fromRect:outExtent]; 

     UIImage *outImage2 = [UIImage imageWithCGImage:cgImage]; 
     CGImageRelease(cgImage); 

     // resize 
     UIImage *resized = [self resizeImage:outImage2 
           withQuality:kCGInterpolationNone 
             rate:2.5]; 
     //Remove the default grey background 
     resized = [self removeColorFromImage:resized grayLevel:137]; 

     dispatch_async(dispatch_get_main_queue(), 
     ^{ 
      self.histogramView.image = resized; 
     }); 

Während es zu Swift Umwandlung, begann ich diese Fehler bekommen:

var pixelBuffer: CVPixelBufferRef = CMSampleBufferGetImageBuffer(sampleBuffer)! 
    var attachments: CFDictionaryRef = CMCopyDictionaryOfAttachments(kCFAllocatorDefault, sampleBuffer, kCMAttachmentMode_ShouldPropagate)! 
    var ciImage: CIImage = CIImage(cVPixelBuffer: pixelBuffer, options: (attachments as! [NSObject : AnyObject])) 

Das letzte Zeile gibt mir den Fehler:

Argument labels '(cVPixelBuffer:, options:)' do not match any available overloads 

Answer 1

//Show Histogram -- Swift version 
    var pixelBuffer: CVPixelBufferRef = CMSampleBufferGetImageBuffer(sampleBuffer)! 
    var attachments: CFDictionaryRef = CMCopyDictionaryOfAttachments(kCFAllocatorDefault, sampleBuffer, kCMAttachmentMode_ShouldPropagate)! 
    var ciImage: CIImage = CIImage(CVPixelBuffer: pixelBuffer, options: attachments as? [String : AnyObject]) 

    var count = 256 
    count = count <= 256 ? count : 256 
    count = count >= 1 ? count : 1 

    let params = [kCIInputImageKey: ciImage, 
     kCIInputExtentKey:CIVector.init(CGRect: ciImage.extent), 
     "inputCount":256, "inputScale":200] 

    let filter:CIFilter! = CIFilter(name: "CIAreaHistogram" , withInputParameters: params) 


    let outImage: CIImage = (filter?.outputImage)! 
    //--------------------------------------------- 

    let context:CIContext = CIContext(options: nil) 

    let params2 = [kCIInputImageKey: outImage] 


    let filter2 = CIFilter(name: "CIHistogramDisplayFilter",withInputParameters: params2) 

    let outputImage:CIImage = filter2!.outputImage! 
    let outExtent:CGRect = outputImage.extent 

    let cgImage:CGImageRef = context.createCGImage(outputImage, fromRect: outExtent) 

    let outImage2:UIImage = UIImage(CGImage: cgImage) 

    // resize 

    let resized:UIImage = self.resizeImage(outImage2,withQuality:CGInterpolation.None,rate:2.5) 

    //Remove the default grey background 

    resized = self.removeColorFromImage(resized, grayLevel:137) 


    dispatch_async(dispatch_get_main_queue()) { 
     self.histogramView.image = resized 
    }