让iOS相机在Swift 2中输出浮点值

我试图在这个网站上实现这个例子来从相机获取浮动图像，但是我得到的输出图像仍然是UInt32像素（每个= 4 x UInt8颜色值）。

我不明白为什么转换到float32像素颜色组件不会发生。 所有我调整了迅速2.0更新。

代码收集在一起：

let output = AVCaptureVideoDataOutput() var settings = [kCVPixelBufferPixelFormatTypeKey as NSString:kCVPixelFormatType_32BGRA] output.videoSettings = settings output.alwaysDiscardsLateVideoFrames = true func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!) // Get Video Buffer var imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) // Lock the base address of the pixel buffer CVPixelBufferLockBaseAddress(imageBuffer, 0) // Width and height var width = CVPixelBufferGetWidth(imageBuffer); var height = CVPixelBufferGetHeight(imageBuffer); // Get the number of bytes per row for the pixel buffer var bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer) // RGB Colorspace var colorSpace = CGColorSpaceCreateDeviceRGB() // The raw pointer to the buffer data var baseAddress : UnsafeMutablePointer<Void> = CVPixelBufferGetBaseAddress(imageBuffer) var baseAddressUint8 : UnsafeMutablePointer<UInt8> = UnsafeMutablePointer<UInt8>(baseAddress) // The bitmap info for the buffer data, we have 32BGRA //var bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.PremultipliedFirst.rawValue) | CGBitmapInfo.ByteOrder32Little //I updated the previous to swift 2 with: let bitmapInfo:CGBitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.PremultipliedFirst.rawValue | CGBitmapInfo.ByteOrder32Little.rawValue) let destBitmapInfo:CGBitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.PremultipliedFirst.rawValue | CGBitmapInfo.FloatComponents.rawValue | CGBitmapInfo.ByteOrderDefault.rawValue) // Create a bitmap graphics context with the sample buffer data let context = CGBitmapContextCreate(baseAddressUint8, width, height, 8, bytesPerRow, colorSpace, bitmapInfo) var sourceBuffer = vImage_Buffer(data:CGBitmapContextGetData(context), height:vImagePixelCount(height), width:vImagePixelCount(width), rowBytes:bytesPerRow) var targetBufferPtr = UnsafeMutablePointer<Float>.alloc(width*height*4) var targetBuffer = vImage_Buffer(data: targetBufferPtr!, height: vImagePixelCount(height), width: vImagePixelCount(width), rowBytes: width*16) var srcFormat : vImage_CGImageFormat = vImage_CGImageFormat( bitsPerComponent: UInt32(8), bitsPerPixel: UInt32(32), colorSpace: nil, bitmapInfo: bitmapInfo, version: UInt32(0), decode: nil, renderingIntent: CGColorRenderingIntent.RenderingIntentDefault ) var destFormat : vImage_CGImageFormat = vImage_CGImageFormat( bitsPerComponent: UInt32(32), bitsPerPixel: UInt32(128), colorSpace: nil, bitmapInfo: destBitmapInfo, version: UInt32(0), decode: nil, renderingIntent: CGColorRenderingIntent.RenderingIntentDefault ) var err : vImage_Error = 0 var c = vImageConverter_CreateWithCGImageFormat( &srcFormat, &destFormat, nil, UInt32(kvImagePrintDiagnosticsToConsole), &err) err = vImageConvert_AnyToAny( c.takeUnretainedValue(), &sourceBuffer, &targetBuffer, nil, UInt32(kvImagePrintDiagnosticsToConsole)) //My addition to get pixel values let outImage = vImageCreateCGImageFromBuffer( &targetBuffer, &destFormat, nil, nil, vImage_Flags(kvImageNoFlags), &err ) let cameraImage = CIImage(CGImage: outImage.takeUnretainedValue()) let ctx = CIContext(options:nil) let cgImage = ctx.createCGImage(cameraImage, fromRect:outputImage.extent) let rawData:NSData = CGDataProviderCopyData(CGImageGetDataProvider(cgImage))! let pixelcolors = UnsafePointer<Float32>(rawData.bytes) let pixelcolors_pointer = UnsafeBufferPointer<Float32>(start:pixelcolors, count:4) var BGRA_index = 0 for pixelcolor in UnsafeBufferPointer(start: pixelcolors_pointer.baseAddress, count: pixelcolors_pointer.count) { if (pixelcolor.isNaN){break} switch BGRA_index { case 0: bluemean = CGFloat (pixelcolor) case 1: greenmean = CGFloat (pixelcolor) case 2: redmean = CGFloat (pixelcolor) case 3: break default: break } BGRA_index += 1 } }